public class Test
{
int i;
int j;
public Test(int i, int j)
{
this.i=i;
this.j=j;
}
public void change()
{
int x=i;
i=j;
j=x;
}
public static void main(String[] args)
{
Test t=new Test(2,3);
System.out.println(t.i+" "+t.j);
t.change();
System.out.println(t.i+" "+t.j);//调换了
}
}