langtools/test/tools/javac/ForwardReference/UseBeforeDeclaration.java
author jjg
Fri, 09 Apr 2010 15:39:39 -0700
changeset 5319 63dc7f367a37
parent 10 06bc494ca11e
child 5520 86e4b9a9da40
permissions -rw-r--r--
6942649: add hidden option to identify location and version of javac classes Reviewed-by: darcy
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/*
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 * Copyright 2002 Sun Microsystems, Inc.  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.
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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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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/*
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 * @test
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 * @bug 4459133
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 * @summary Forward reference legal or illegal?
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 * @author gafter
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 *
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 * @compile UseBeforeDeclaration.java
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 */
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class UseBeforeDeclaration {
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    static {
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        x = 100; // ok - assignment
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//      int y = ((x)) + 1; // error - read before declaration
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        int v = ((x)) = 3; // ok - x at left hand side of assignment
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        int z = UseBeforeDeclaration.x * 2; // ok - not accessed via simple name
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        Object o = new Object(){
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                void foo(){x++;} // ok - occurs in a different class
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                {x++;} // ok - occurs in a different class
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            };
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    }
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    {
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        j = 200; // ok - assignment
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//      j = j + 1; // error - right hand side reads before declaration
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//      int k = j = j + 1; // error - right hand side reads before declaration
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        int n = j = 300; // ok - j at left hand side of assignment
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//      int h = j++; // error - read before declaration
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        int l = this.j * 3; // ok - not accessed via simple name
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        Object o = new Object(){
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                void foo(){j++;} // ok - occurs in a different class
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                { j = j + 1;} // ok - occurs in a different class
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            };
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    }
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    int w = x= 3; // ok - x at left hand side of assignment
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    int p = x; // ok - instance initializers may access static fields
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    static int u = (new Object(){int bar(){return x;}}).bar(); // ok - occurs in a different class
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    static int x;
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    int m = j = 4; // ok - j at left hand side of assignment
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    int o = (new Object(){int bar(){return j;}}).bar(); // ok - occurs in a different class
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    int j;
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}