1. Relational operators generate a "Boolean" result. They evaluate the relationship between operand values. The relational expression yields true if the relationship is true; false if the relationship is not true.
1. Check whether the objects are equal (== or !=)
Integer n1 = new Integer(47); Integer n2 = new Integer(47); System.out.println(n1 == n2); //结果为false System.out.println(n1 != n2); //结果为true 因为==与!=都是比较对象的句柄,n1和n2尽管Integer对象相同,对象内容相同,但是句柄不同 2. equals()的使用 Integer n1 = new Integer(47); Integer n2 = new Integer(47); System.out.println(n1.equals(n2)); //ture equals比较的是对象内容,所以为ture; class Value { int i; } public class EqualsMethod2 { public static void main(String[] args) { Value n1 = new Value(); Value n2 = new Value(); n1.i = n2.i = 10; System.out.println(n1.equals(n2)); //false } } 此时的结果又变回了false!这是由于 equals()的默认行为是比较句柄。所以除非在自己的新类中改变了 equals(),否则不可能表现出我们希望的行为。
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