test/tools/javac/ForwardReference/UseBeforeDeclaration.java

Wed, 27 Apr 2016 01:34:52 +0800

author
aoqi
date
Wed, 27 Apr 2016 01:34:52 +0800
changeset 0
959103a6100f
child 2525
2eb010b6cb22
permissions
-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/
changeset: 2573:53ca196be1ae
tag: jdk8u25-b17

aoqi@0 1 /*
aoqi@0 2 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved.
aoqi@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0 4 *
aoqi@0 5 * This code is free software; you can redistribute it and/or modify it
aoqi@0 6 * under the terms of the GNU General Public License version 2 only, as
aoqi@0 7 * published by the Free Software Foundation.
aoqi@0 8 *
aoqi@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0 12 * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0 13 * accompanied this code).
aoqi@0 14 *
aoqi@0 15 * You should have received a copy of the GNU General Public License version
aoqi@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0 18 *
aoqi@0 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0 20 * or visit www.oracle.com if you need additional information or have any
aoqi@0 21 * questions.
aoqi@0 22 */
aoqi@0 23
aoqi@0 24 /*
aoqi@0 25 * @test
aoqi@0 26 * @bug 4459133
aoqi@0 27 * @summary Forward reference legal or illegal?
aoqi@0 28 * @author gafter
aoqi@0 29 *
aoqi@0 30 * @compile UseBeforeDeclaration.java
aoqi@0 31 */
aoqi@0 32
aoqi@0 33 class UseBeforeDeclaration {
aoqi@0 34 static {
aoqi@0 35 x = 100; // ok - assignment
aoqi@0 36 // int y = ((x)) + 1; // error - read before declaration
aoqi@0 37 int v = ((x)) = 3; // ok - x at left hand side of assignment
aoqi@0 38 int z = UseBeforeDeclaration.x * 2; // ok - not accessed via simple name
aoqi@0 39 Object o = new Object(){
aoqi@0 40 void foo(){x++;} // ok - occurs in a different class
aoqi@0 41 {x++;} // ok - occurs in a different class
aoqi@0 42 };
aoqi@0 43 }
aoqi@0 44 {
aoqi@0 45 j = 200; // ok - assignment
aoqi@0 46 // j = j + 1; // error - right hand side reads before declaration
aoqi@0 47 // int k = j = j + 1; // error - right hand side reads before declaration
aoqi@0 48 int n = j = 300; // ok - j at left hand side of assignment
aoqi@0 49 // int h = j++; // error - read before declaration
aoqi@0 50 int l = this.j * 3; // ok - not accessed via simple name
aoqi@0 51 Object o = new Object(){
aoqi@0 52 void foo(){j++;} // ok - occurs in a different class
aoqi@0 53 { j = j + 1;} // ok - occurs in a different class
aoqi@0 54 };
aoqi@0 55 }
aoqi@0 56 int w = x= 3; // ok - x at left hand side of assignment
aoqi@0 57 int p = x; // ok - instance initializers may access static fields
aoqi@0 58 static int u = (new Object(){int bar(){return x;}}).bar(); // ok - occurs in a different class
aoqi@0 59 static int x;
aoqi@0 60 int m = j = 4; // ok - j at left hand side of assignment
aoqi@0 61 int o = (new Object(){int bar(){return j;}}).bar(); // ok - occurs in a different class
aoqi@0 62 int j;
aoqi@0 63 }

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