Java Long 对象的相等比较_JAVA_编程开发_程序员俱乐部

class="java" name="code">
Long originalLong = (long) -128;
		Long newLong = (long) -128;
		System.out.println("Object Compare:" + (originalLong == newLong));
		System.out.println("LongValue Compare:" + (originalLong.longValue() == newLong.longValue()));
		System.out.println("Equals Compare:" + originalLong.equals(newLong));

结果为：
Object Compare:true
LongValue Compare:true
Equals Compare:true

Long originalLong = (long) 127;
		Long newLong = (long) 127;
		System.out.println("Object Compare:" + (originalLong == newLong));
		System.out.println("LongValue Compare:" + (originalLong.longValue() == newLong.longValue()));
		System.out.println("Equals Compare:" + originalLong.equals(newLong));

结果为：
Object Compare:true
LongValue Compare:true
Equals Compare:true

Long originalLong = (long) -129;
		Long newLong = (long) -129;
		System.out.println("Object Compare:" + (originalLong == newLong));
		System.out.println("LongValue Compare:" + (originalLong.longValue() == newLong.longValue()));
		System.out.println("Equals Compare:" + originalLong.equals(newLong));

结果为：
Object Compare:false
LongValue Compare:true
Equals Compare:true

Long originalLong = (long) 128;
		Long newLong = (long) 128;
		System.out.println("Object Compare:" + (originalLong == newLong));
		System.out.println("LongValue Compare:" + (originalLong.longValue() == newLong.longValue()));
		System.out.println("Equals Compare:" + originalLong.equals(newLong));

结果为：
Object Compare:false
LongValue Compare:true
Equals Compare:true

总结：当Long对象的值在long类型的区间内是，比较对象的值是否相等可以两个对象直接用“==”比较，否则需要利用其他两种方式比较，才能得到正确的结果。
结论：比较两个Long对象昂的值是否相等的时候，直接使用其他两种方式比较，而不要使用“==”caozuofu.html" target="_blank">操作符。