author | joehw |
Thu, 01 Mar 2018 15:31:04 -0800 | |
changeset 49115 | ecfaa82c53be |
parent 47216 | 71c04702a3d5 |
child 53653 | 868611f0adc3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.lang; |
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import jdk.internal.HotSpotIntrinsicCandidate; |
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/** |
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* A mutable sequence of characters. This class provides an API compatible |
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* with {@code StringBuffer}, but with no guarantee of synchronization. |
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* This class is designed for use as a drop-in replacement for |
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* {@code StringBuffer} in places where the string buffer was being |
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* used by a single thread (as is generally the case). Where possible, |
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* it is recommended that this class be used in preference to |
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* {@code StringBuffer} as it will be faster under most implementations. |
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* |
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* <p>The principal operations on a {@code StringBuilder} are the |
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* {@code append} and {@code insert} methods, which are |
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* overloaded so as to accept data of any type. Each effectively |
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* converts a given datum to a string and then appends or inserts the |
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* characters of that string to the string builder. The |
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* {@code append} method always adds these characters at the end |
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* of the builder; the {@code insert} method adds the characters at |
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* a specified point. |
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* <p> |
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* For example, if {@code z} refers to a string builder object |
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* whose current contents are "{@code start}", then |
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* the method call {@code z.append("le")} would cause the string |
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* builder to contain "{@code startle}", whereas |
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* {@code z.insert(4, "le")} would alter the string builder to |
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* contain "{@code starlet}". |
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* <p> |
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* In general, if sb refers to an instance of a {@code StringBuilder}, |
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* then {@code sb.append(x)} has the same effect as |
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* {@code sb.insert(sb.length(), x)}. |
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* <p> |
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* Every string builder has a capacity. As long as the length of the |
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* character sequence contained in the string builder does not exceed |
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* the capacity, it is not necessary to allocate a new internal |
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* buffer. If the internal buffer overflows, it is automatically made larger. |
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* |
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* <p>Instances of {@code StringBuilder} are not safe for |
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* use by multiple threads. If such synchronization is required then it is |
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* recommended that {@link java.lang.StringBuffer} be used. |
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* |
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* <p>Unless otherwise noted, passing a {@code null} argument to a constructor |
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* or method in this class will cause a {@link NullPointerException} to be |
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* thrown. |
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* |
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* @apiNote |
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* {@code StringBuilder} implements {@code Comparable} but does not override |
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* {@link Object#equals equals}. Thus, the natural ordering of {@code StringBuilder} |
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* is inconsistent with equals. Care should be exercised if {@code StringBuilder} |
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* objects are used as keys in a {@code SortedMap} or elements in a {@code SortedSet}. |
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* See {@link Comparable}, {@link java.util.SortedMap SortedMap}, or |
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* {@link java.util.SortedSet SortedSet} for more information. |
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* |
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* @author Michael McCloskey |
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* @see java.lang.StringBuffer |
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* @see java.lang.String |
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* @since 1.5 |
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*/ |
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public final class StringBuilder |
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extends AbstractStringBuilder |
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implements java.io.Serializable, Comparable<StringBuilder>, CharSequence |
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{ |
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/** use serialVersionUID for interoperability */ |
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static final long serialVersionUID = 4383685877147921099L; |
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/** |
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* Constructs a string builder with no characters in it and an |
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* initial capacity of 16 characters. |
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*/ |
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@HotSpotIntrinsicCandidate |
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public StringBuilder() { |
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super(16); |
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} |
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/** |
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* Constructs a string builder with no characters in it and an |
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* initial capacity specified by the {@code capacity} argument. |
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* |
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* @param capacity the initial capacity. |
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* @throws NegativeArraySizeException if the {@code capacity} |
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* argument is less than {@code 0}. |
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*/ |
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@HotSpotIntrinsicCandidate |
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public StringBuilder(int capacity) { |
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super(capacity); |
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} |
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/** |
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* Constructs a string builder initialized to the contents of the |
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* specified string. The initial capacity of the string builder is |
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* {@code 16} plus the length of the string argument. |
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* |
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* @param str the initial contents of the buffer. |
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*/ |
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@HotSpotIntrinsicCandidate |
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public StringBuilder(String str) { |
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super(str.length() + 16); |
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append(str); |
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} |
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/** |
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* Constructs a string builder that contains the same characters |
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* as the specified {@code CharSequence}. The initial capacity of |
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* the string builder is {@code 16} plus the length of the |
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* {@code CharSequence} argument. |
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* |
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* @param seq the sequence to copy. |
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*/ |
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public StringBuilder(CharSequence seq) { |
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this(seq.length() + 16); |
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append(seq); |
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} |
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/** |
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* Compares two {@code StringBuilder} instances lexicographically. This method |
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* follows the same rules for lexicographical comparison as defined in the |
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* {@linkplain java.lang.CharSequence#compare(java.lang.CharSequence, |
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* java.lang.CharSequence) CharSequence.compare(this, another)} method. |
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* |
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* <p> |
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* For finer-grained, locale-sensitive String comparison, refer to |
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* {@link java.text.Collator}. |
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* |
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* @param another the {@code StringBuilder} to be compared with |
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* |
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* @return the value {@code 0} if this {@code StringBuilder} contains the same |
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* character sequence as that of the argument {@code StringBuilder}; a negative integer |
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* if this {@code StringBuilder} is lexicographically less than the |
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* {@code StringBuilder} argument; or a positive integer if this {@code StringBuilder} |
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* is lexicographically greater than the {@code StringBuilder} argument. |
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* |
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* @since 11 |
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*/ |
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@Override |
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public int compareTo(StringBuilder another) { |
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return super.compareTo(another); |
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} |
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@Override |
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public StringBuilder append(Object obj) { |
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return append(String.valueOf(obj)); |
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} |
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@Override |
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@HotSpotIntrinsicCandidate |
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public StringBuilder append(String str) { |
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super.append(str); |
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return this; |
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} |
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/** |
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* Appends the specified {@code StringBuffer} to this sequence. |
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* <p> |
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* The characters of the {@code StringBuffer} argument are appended, |
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* in order, to this sequence, increasing the |
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* length of this sequence by the length of the argument. |
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* If {@code sb} is {@code null}, then the four characters |
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* {@code "null"} are appended to this sequence. |
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* <p> |
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* Let <i>n</i> be the length of this character sequence just prior to |
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* execution of the {@code append} method. Then the character at index |
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* <i>k</i> in the new character sequence is equal to the character at |
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* index <i>k</i> in the old character sequence, if <i>k</i> is less than |
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* <i>n</i>; otherwise, it is equal to the character at index <i>k-n</i> |
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* in the argument {@code sb}. |
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* |
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* @param sb the {@code StringBuffer} to append. |
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* @return a reference to this object. |
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*/ |
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public StringBuilder append(StringBuffer sb) { |
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super.append(sb); |
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return this; |
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} |
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@Override |
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public StringBuilder append(CharSequence s) { |
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super.append(s); |
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return this; |
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} |
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/** |
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* @throws IndexOutOfBoundsException {@inheritDoc} |
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*/ |
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@Override |
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public StringBuilder append(CharSequence s, int start, int end) { |
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super.append(s, start, end); |
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return this; |
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} |
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@Override |
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public StringBuilder append(char[] str) { |
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super.append(str); |
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return this; |
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} |
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/** |
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* @throws IndexOutOfBoundsException {@inheritDoc} |
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*/ |
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@Override |
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public StringBuilder append(char[] str, int offset, int len) { |
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super.append(str, offset, len); |
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return this; |
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} |
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@Override |
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public StringBuilder append(boolean b) { |
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super.append(b); |
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return this; |
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} |
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@Override |
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@HotSpotIntrinsicCandidate |
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public StringBuilder append(char c) { |
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super.append(c); |
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return this; |
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} |
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@Override |
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@HotSpotIntrinsicCandidate |
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public StringBuilder append(int i) { |
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super.append(i); |
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return this; |
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} |
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@Override |
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public StringBuilder append(long lng) { |
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super.append(lng); |
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return this; |
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} |
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@Override |
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public StringBuilder append(float f) { |
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super.append(f); |
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return this; |
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} |
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@Override |
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public StringBuilder append(double d) { |
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super.append(d); |
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return this; |
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} |
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/** |
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* @since 1.5 |
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*/ |
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@Override |
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public StringBuilder appendCodePoint(int codePoint) { |
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super.appendCodePoint(codePoint); |
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return this; |
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} |
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/** |
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* @throws StringIndexOutOfBoundsException {@inheritDoc} |
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*/ |
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@Override |
2 | 283 |
public StringBuilder delete(int start, int end) { |
284 |
super.delete(start, end); |
|
285 |
return this; |
|
286 |
} |
|
287 |
||
288 |
/** |
|
289 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
290 |
*/ |
|
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291 |
@Override |
2 | 292 |
public StringBuilder deleteCharAt(int index) { |
293 |
super.deleteCharAt(index); |
|
294 |
return this; |
|
295 |
} |
|
296 |
||
297 |
/** |
|
298 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
299 |
*/ |
|
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300 |
@Override |
2 | 301 |
public StringBuilder replace(int start, int end, String str) { |
302 |
super.replace(start, end, str); |
|
303 |
return this; |
|
304 |
} |
|
305 |
||
306 |
/** |
|
307 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
308 |
*/ |
|
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@Override |
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|
310 |
public StringBuilder insert(int index, char[] str, int offset, |
2 | 311 |
int len) |
312 |
{ |
|
313 |
super.insert(index, str, offset, len); |
|
314 |
return this; |
|
315 |
} |
|
316 |
||
317 |
/** |
|
318 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
319 |
*/ |
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@Override |
2 | 321 |
public StringBuilder insert(int offset, Object obj) { |
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super.insert(offset, obj); |
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return this; |
2 | 324 |
} |
325 |
||
326 |
/** |
|
327 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
328 |
*/ |
|
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329 |
@Override |
2 | 330 |
public StringBuilder insert(int offset, String str) { |
331 |
super.insert(offset, str); |
|
332 |
return this; |
|
333 |
} |
|
334 |
||
335 |
/** |
|
336 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
337 |
*/ |
|
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338 |
@Override |
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|
339 |
public StringBuilder insert(int offset, char[] str) { |
2 | 340 |
super.insert(offset, str); |
341 |
return this; |
|
342 |
} |
|
343 |
||
344 |
/** |
|
345 |
* @throws IndexOutOfBoundsException {@inheritDoc} |
|
346 |
*/ |
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347 |
@Override |
2 | 348 |
public StringBuilder insert(int dstOffset, CharSequence s) { |
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|
349 |
super.insert(dstOffset, s); |
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350 |
return this; |
2 | 351 |
} |
352 |
||
353 |
/** |
|
354 |
* @throws IndexOutOfBoundsException {@inheritDoc} |
|
355 |
*/ |
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|
356 |
@Override |
2 | 357 |
public StringBuilder insert(int dstOffset, CharSequence s, |
358 |
int start, int end) |
|
359 |
{ |
|
360 |
super.insert(dstOffset, s, start, end); |
|
361 |
return this; |
|
362 |
} |
|
363 |
||
364 |
/** |
|
365 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
366 |
*/ |
|
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367 |
@Override |
2 | 368 |
public StringBuilder insert(int offset, boolean b) { |
369 |
super.insert(offset, b); |
|
370 |
return this; |
|
371 |
} |
|
372 |
||
373 |
/** |
|
374 |
* @throws IndexOutOfBoundsException {@inheritDoc} |
|
375 |
*/ |
|
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|
376 |
@Override |
2 | 377 |
public StringBuilder insert(int offset, char c) { |
378 |
super.insert(offset, c); |
|
379 |
return this; |
|
380 |
} |
|
381 |
||
382 |
/** |
|
383 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
384 |
*/ |
|
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|
385 |
@Override |
2 | 386 |
public StringBuilder insert(int offset, int i) { |
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|
387 |
super.insert(offset, i); |
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|
388 |
return this; |
2 | 389 |
} |
390 |
||
391 |
/** |
|
392 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
393 |
*/ |
|
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|
394 |
@Override |
2 | 395 |
public StringBuilder insert(int offset, long l) { |
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|
396 |
super.insert(offset, l); |
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|
397 |
return this; |
2 | 398 |
} |
399 |
||
400 |
/** |
|
401 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
402 |
*/ |
|
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|
403 |
@Override |
2 | 404 |
public StringBuilder insert(int offset, float f) { |
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|
405 |
super.insert(offset, f); |
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|
406 |
return this; |
2 | 407 |
} |
408 |
||
409 |
/** |
|
410 |
* @throws StringIndexOutOfBoundsException {@inheritDoc} |
|
411 |
*/ |
|
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|
412 |
@Override |
2 | 413 |
public StringBuilder insert(int offset, double d) { |
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|
414 |
super.insert(offset, d); |
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|
415 |
return this; |
2 | 416 |
} |
417 |
||
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|
418 |
@Override |
2 | 419 |
public int indexOf(String str) { |
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|
420 |
return super.indexOf(str); |
2 | 421 |
} |
422 |
||
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423 |
@Override |
2 | 424 |
public int indexOf(String str, int fromIndex) { |
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|
425 |
return super.indexOf(str, fromIndex); |
2 | 426 |
} |
427 |
||
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428 |
@Override |
2 | 429 |
public int lastIndexOf(String str) { |
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|
430 |
return super.lastIndexOf(str); |
2 | 431 |
} |
432 |
||
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433 |
@Override |
2 | 434 |
public int lastIndexOf(String str, int fromIndex) { |
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|
435 |
return super.lastIndexOf(str, fromIndex); |
2 | 436 |
} |
437 |
||
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|
438 |
@Override |
2 | 439 |
public StringBuilder reverse() { |
440 |
super.reverse(); |
|
441 |
return this; |
|
442 |
} |
|
443 |
||
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|
444 |
@Override |
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|
445 |
@HotSpotIntrinsicCandidate |
2 | 446 |
public String toString() { |
447 |
// Create a copy, don't share the array |
|
33663 | 448 |
return isLatin1() ? StringLatin1.newString(value, 0, count) |
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|
449 |
: StringUTF16.newString(value, 0, count); |
2 | 450 |
} |
451 |
||
452 |
/** |
|
14997 | 453 |
* Save the state of the {@code StringBuilder} instance to a stream |
2 | 454 |
* (that is, serialize it). |
455 |
* |
|
456 |
* @serialData the number of characters currently stored in the string |
|
14997 | 457 |
* builder ({@code int}), followed by the characters in the |
458 |
* string builder ({@code char[]}). The length of the |
|
459 |
* {@code char} array may be greater than the number of |
|
2 | 460 |
* characters currently stored in the string builder, in which |
461 |
* case extra characters are ignored. |
|
462 |
*/ |
|
463 |
private void writeObject(java.io.ObjectOutputStream s) |
|
464 |
throws java.io.IOException { |
|
465 |
s.defaultWriteObject(); |
|
466 |
s.writeInt(count); |
|
33663 | 467 |
char[] val = new char[capacity()]; |
468 |
if (isLatin1()) { |
|
469 |
StringLatin1.getChars(value, 0, count, val, 0); |
|
470 |
} else { |
|
471 |
StringUTF16.getChars(value, 0, count, val, 0); |
|
472 |
} |
|
473 |
s.writeObject(val); |
|
2 | 474 |
} |
475 |
||
476 |
/** |
|
477 |
* readObject is called to restore the state of the StringBuffer from |
|
478 |
* a stream. |
|
479 |
*/ |
|
480 |
private void readObject(java.io.ObjectInputStream s) |
|
481 |
throws java.io.IOException, ClassNotFoundException { |
|
482 |
s.defaultReadObject(); |
|
483 |
count = s.readInt(); |
|
33663 | 484 |
char[] val = (char[]) s.readObject(); |
485 |
initBytes(val, 0, val.length); |
|
2 | 486 |
} |
487 |
||
488 |
} |