3.10swap.java

JAVA程序设计的源代码

public class Swap{
public static void main(String args[]){
Integer a,b;
a=new Integer(10);    //Integer相当于int
b=new Integer(50);
System.out.println("before swap．．．");
System.out.println("a is "+a);
System.out.println("b is "+b);
swap(a,b);    //交换a与b的值
System.out.println("after swap．．．");
System.out.println("a is "+a);
System.out.println("b is "+b);
}
public static void swap(Integer pa,Integer pb){
Integer temp=pa;    //借助临时变量进行交换
pa=pb;
pb=temp;
System.out.println("in swap．．．");
System.out.println("a is "+pa);
System.out.println("b is "+pb);
}
}