boxedforeach.java

来自「是一款用JAVA 编写的编译器 具有很强的编译功能」· Java 代码 · 共 124 行

/*
 * Copyright 2003-2004 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 4921543 5009601
 * @summary boxing/unboxing versus foreach crashes javac
 * @author gafter
 *
 * @compile -source 1.5 BoxedForeach.java
 * @run main BoxedForeach
 */

import java.util.*;

public class BoxedForeach {
    static void f(Integer[] a) {
        for ( int i : a ) {
	    System.out.println(i);
        }
    }
    static void f(Iterable<Integer> b) {
	g(b);
	h(b);
        for ( int i : b ) {
	    System.out.println(i);
        }
        for ( float i : b ) {
	    System.out.println(i);
        }
	for ( Iterator<Integer> it = b.iterator(); it.hasNext(); ) {
	    float i = it.next();
	}
    }
    static <T extends Integer> void g(Iterable<T> b) {
	for ( int i : b ) {
	    System.out.println(i);
	}
    }
    static void h(Iterable<? extends Integer> b) {
	for ( int i : b ) {
	    System.out.println(i);
	}
    }
    static void f(int[] c) {
        for ( Integer i : c ) {
	    System.out.println(i);
        }
    }
    static <E extends Enum<E>> void f(E[] values) {
	for ( E e : values ) {
	    System.out.println(e);
	}
    }
    static int f() {
	for ( Foo f : foolist() ) {
	    return f.x;
	}
	return 0;
    }
    static List<Foo> foolist() {
	List<Foo> l = new ArrayList<Foo>();
	l.add(new Foo());
	return l;
    }
    enum color { red, green, blue };
    public static void main(String[] args) {
	Integer[] a1 = { Integer.valueOf(1), Integer.valueOf(2) };
	f(a1);
	f(Arrays.asList(a1));
	int[] a2 = { 1, 2, 3 };
	f(a2);
	f(color.values());
	f();
    }
}

class Foo {
    static int n = 0;
    final int x;
    Foo() {
	x = n++;
    }
}

class A {
    class B {
    }
    java.util.List<String> l;
    String[] args;
    {
	for (String s1 : l) {
	    for (String s2 : l) {
		B b = new B();
	    }
	}
	for (String s1 : args) {
	    for (String s2 : args) {
		B b = new B();
	    }
	}
    }
}