j02060413.java

来自「经典java教材《java完美经典》一书中源码的完全收集」· Java 代码 · 共 29 行

import java.lang.*;

class j02060413
{
  public static void main(String para[])
  {  
    Object o1 = new Object();
    Object o2 = new Object();        
    String s1 = new String("壹贰叁");
    String s2 = "壹贰叁";
    Integer I1 = new Integer(100);
    Integer I2 = new Integer(100);    
    
    if(o1 == o2)
        System.out.println("o1 == o2" );  //没有
    if(o1.equals( o2 ))
        System.out.println("o1 equals o2" ); //没有
        
    if(s1 == s2)
        System.out.println("s1 == s2" );  //没有 
    if("壹贰叁".equals( s1 ))
        System.out.println("s1 equals s2" );  //有
        
    if(I1 == I2)
        System.out.println("I1 == I2" );  //没有
    if(I1.equals( I2 ))
        System.out.println("I1 equals I2" );  //有
  }
}