Java Swap函数

class ABC{
 int abc;
 }public class Swap {
 public static void main(String args[]){
 ABC a1=new ABC();
 ABC a2=new ABC();
 a1.abc=111;
 a2.abc=222;
 System.out.println("a.abc:"+a1.abc+" b.abc:"+a2.abc);
 change(a1,a2);
 System.out.println("a.abc:"+a1.abc+" b.abc:"+a2.abc);
 }
 public static void change(ABC a,ABC b){
 ABC temp=new ABC();
 temp.abc=a.abc;
 a.abc=b.abc;
 b.abc=temp.abc;
 }
 }