一个考试题目
package test;public class ArugmentTest{
static class IntA{
private int a;
public IntA(int a){ this.a = a; }
public int getA() { return a; }
public void setA(int a){ this.a = a; }
}
static public void change(int a){
a = 3;
}
static public void change(IntA a){
a.setA(3);
}
static public void changeRef(IntA a){
a = new IntA(9);
}
public static void main(String[] args){
int a = 2;
change(a);
System.out.print(a);
IntA ia = new IntA(5);
change(ia);
System.out.print(ia.getA());
changeRef(ia);
System.out.println(ia.getA());
}
}
