equaltest.java

来自「这是java 2应用开发指南这本书上所有例子的源代码」· Java 代码 · 共 24 行

class A{
  int a=1;
}

public class equalTest{
   public static void main(String[] args) {
    A obj1=new A();
    A obj2=new A();
    String s1,s2,s3="abc",s4="abc";
    s1=new String("abc");
    s2=new String("abc");
    System.out.println("s1=s2?"+(s1.equals(s2)));
    System.out.println("s1=s3?"+(s1==s3));
    System.out.println("s1=s3?"+(s1.equals(s3)));
    System.out.println("s3=s4?"+(s3==s4));
    System.out.println("s2=s3?"+(s2.equals(s3)));
    System.out.println("obj1=obj2?"+(obj1.equals(obj2)));
    System.out.println("s1=s2?"+(s1==s2));
    obj1=obj2;
    System.out.println("obj1=obj2 after obj1=obj2 ?"+(obj1.equals(obj2)));
    System.out.println("obj1=obj2 after obj1=obj2 ?"+(obj1==obj2));
  }
}