1 /*

     2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 8025657

    27  * @summary Test repeating addExact

    28  * @compile RepeatTest.java

    29  * @run main RepeatTest

    30  *

    31  */

    32 

    33 import java.lang.ArithmeticException;

    34 

    35 public class RepeatTest {

    36   public static void main(String[] args) {

    37     java.util.Random rnd = new java.util.Random();

    38     for (int i = 0; i < 50000; ++i) {

    39       int x = Integer.MAX_VALUE - 10;

    40       int y = Integer.MAX_VALUE - 10 + rnd.nextInt(5); //rnd.nextInt() / 2;

    41 

    42       int c = rnd.nextInt() / 2;

    43       int d = rnd.nextInt() / 2;

    44 

    45       int a = addExact(x, y);

    46 

    47       if (a != 36) {

    48           throw new RuntimeException("a != 0 : " + a);

    49       }

    50 

    51       int b = nonExact(c, d);

    52       int n = addExact2(c, d);

    53 

    54 

    55       if (n != b) {

    56         throw new RuntimeException("n != b : " + n + " != " + b);

    57       }

    58     }

    59   }

    60 

    61   public static int addExact2(int x, int y) {

    62       int result = 0;

    63       result += java.lang.Math.addExact(x, y);

    64       result += java.lang.Math.addExact(x, y);

    65       result += java.lang.Math.addExact(x, y);

    66       result += java.lang.Math.addExact(x, y);

    67       return result;

    68   }

    69 

    70   public static int addExact(int x, int y) {

    71     int result = 0;

    72     try {

    73         result += 5;

    74         result = java.lang.Math.addExact(x, y);

    75     } catch (ArithmeticException e) {

    76         result += 1;

    77     }

    78     try {

    79         result += 6;

    80 

    81         result += java.lang.Math.addExact(x, y);

    82     } catch (ArithmeticException e) {

    83         result += 2;

    84     }

    85     try {

    86         result += 7;

    87         result += java.lang.Math.addExact(x, y);

    88     } catch (ArithmeticException e) {

    89         result += 3;

    90     }

    91     try {

    92         result += 8;

    93         result += java.lang.Math.addExact(x, y);

    94     } catch (ArithmeticException e) {

    95         result += 4;

    96     }

    97     return result;

    98   }

    99 

   100   public static int nonExact(int x, int y) {

   101     int result = x + y;

   102     result += x + y;

   103     result += x + y;

   104     result += x + y;

   105     return result;

   106   }

   107 }