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langtools/test/tools/javac/ForwardReference/UseBeforeDeclaration.java

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+/*
+ * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4459133
+ * @summary Forward reference legal or illegal?
+ * @author gafter
+ *
+ * @compile UseBeforeDeclaration.java
+ */
+
+class UseBeforeDeclaration {
+    static {
+        x = 100; // ok - assignment
+//      int y = ((x)) + 1; // error - read before declaration
+        int v = ((x)) = 3; // ok - x at left hand side of assignment
+        int z = UseBeforeDeclaration.x * 2; // ok - not accessed via simple name
+        Object o = new Object(){
+                void foo(){x++;} // ok - occurs in a different class
+                {x++;} // ok - occurs in a different class
+            };
+    }
+    {
+        j = 200; // ok - assignment
+//      j = j + 1; // error - right hand side reads before declaration
+//      int k = j = j + 1; // error - right hand side reads before declaration
+        int n = j = 300; // ok - j at left hand side of assignment
+//      int h = j++; // error - read before declaration
+        int l = this.j * 3; // ok - not accessed via simple name
+        Object o = new Object(){
+                void foo(){j++;} // ok - occurs in a different class
+                { j = j + 1;} // ok - occurs in a different class
+            };
+    }
+    int w = x= 3; // ok - x at left hand side of assignment
+    int p = x; // ok - instance initializers may access static fields
+    static int u = (new Object(){int bar(){return x;}}).bar(); // ok - occurs in a different class
+    static int x;
+    int m = j = 4; // ok - j at left hand side of assignment
+    int o = (new Object(){int bar(){return j;}}).bar(); // ok - occurs in a different class
+    int j;
+}