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Introduction to relational operators in java

Mar 22, 2017 pm 05:13 PM
javaoperator

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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