boxingcaching.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 222 行

/*
 * Copyright 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 4990346
 * @summary Verify autoboxed values are cached as required.
 * @author Joseph D. Darcy
 *
 * @compile -source 1.5 BoxingCaching.java
 * @run main BoxingCaching
 */

public class BoxingCaching {

    static boolean verifyBooleanCaching() {
	boolean cached = true;

	Boolean results[] = new Boolean[2];

	results[0] = false;
	results[1] = true;

	Boolean B;

	B = false;
	if (B != results[0]) {
		cached = false;
		System.err.println("Boolean value " + B + 
				   " is not cached appropriately.");
	}

	B = true;
	if (B != results[1]) {
		cached = false;
		System.err.println("Boolean value " + B + 
				   " is not cached appropriately.");
	}

	return cached;
    }

    static boolean verifyByteCaching() {
	boolean cached = true;

	Byte results[] = new Byte[-(-128) + 127 +1];
	for(int i = 0; i < results.length; i++)
	    results[i] = (byte)(i-128);

	for(int i = 0; i < results.length; i++) {
	    Byte B = (byte)(i-128);
	    if (B != results[i]) {
		cached = false;
		System.err.println("Byte value " + B + 
				   " is not cached appropriately.");
	    }
	}

	for(int i = Byte.MIN_VALUE; i < Byte.MAX_VALUE; i++) {
	    Byte B;
	    B = (byte)i;
	    if (B.byteValue() != i) {
		cached = false;
		System.err.println("Erroneous autoboxing conversion for " + 
				   "byte value " + i + " .");
	    }
	}

	return cached;
    }

    static boolean verifyCharacterCaching() {
	boolean cached = true;

	Character results[] = new Character[127 +1];
	for(int i = 0; i < results.length; i++)
	    results[i] = (char)i;

	for(int i = 0; i < results.length; i++) {
	    Character C = (char)i;
	    if (C != results[i]) {
		cached = false;
		System.err.println("Char value " + C + 
				   " is not cached appropriately.");
	    }
	}

	for(int i = Character.MIN_VALUE; i < Character.MAX_VALUE; i++) {
	    Character C;
	    C = (char)i;
	    if (C.charValue() != i) {
		cached = false;
		System.err.println("Erroneous autoboxing conversion for " + 
				   "char value " + i + " .");
	    }
	}

	return cached;
    }

    static boolean verifyIntegerCaching() {
	boolean cached = true;

	Integer results[] = new Integer[-(-128) + 127 +1];
	for(int i = 0; i < results.length; i++)
	    results[i] = (i-128);

	for(int i = 0; i < results.length; i++) {
	    Integer I = (i-128);
	    if (I != results[i]) {
		cached = false;
		System.err.println("Integer value " + I + 
				   " is not cached appropriately.");
	    }
	}

	for(int i = -256; i < 255; i++) {
	    Integer I;
	    I = i;
	    if (I.intValue() != i) {
		cached = false;
		System.err.println("Erroneous autoboxing conversion for " + 
				   "int value " + i + " .");
	    }
	}

	return cached;
    }

    static boolean verifyLongCaching() {
	boolean cached = true;

	Long results[] = new Long[-(-128) + 127 +1];
	for(int i = 0; i < results.length; i++)
	    results[i] = (long)(i-128);

	for(int i = 0; i < results.length; i++) {
	    Long L = (long)(i-128);
	    if (L != results[i]) {
		cached = false;
		System.err.println("Integer value " + L + 
				   " is not cached appropriately.");
	    }
	}

	for(int i = -256; i < 255; i++) {
	    Integer L;
	    L = i;
	    if (L.longValue() != i) {
		cached = false;
		System.err.println("Erroneous autoboxing conversion for " + 
				   "int value " + i + " .");
	    }
	}

	return cached;
    }

    static boolean verifyShortCaching() {
	boolean cached = true;

	Short results[] = new Short[-(-128) + 127 +1];
	for(int i = 0; i < results.length; i++)
	    results[i] = (short)(i-128);

	for(int i = 0; i < results.length; i++) {
	    Short S = (short)(i-128);
	    if (S != results[i]) {
		cached = false;
		System.err.println("Short value " + S + 
				   " is not cached appropriately.");
	    }
	}

	for(int i = Short.MIN_VALUE; i < Short.MAX_VALUE; i++) {
	    Short S;
	    S = (short)i;
	    if (S.shortValue() != i) {
		cached = false;
		System.err.println("Erroneous autoboxing conversion for " + 
				   "short value " + i + " .");
	    }
	}

	return cached;
    }

    public static void main(String argv[]) {
	boolean cached = true;
	
	cached &= verifyBooleanCaching();
	cached &= verifyByteCaching();
	cached &= verifyCharacterCaching();
	cached &= verifyIntegerCaching();
	cached &= verifyLongCaching();
	cached &= verifyShortCaching();
	
	if (!cached)
	    throw new RuntimeException("Values not cached appropriately.");
    }
}