简单面试题--值传递还是引用传递
package com.jo;
public class CTest {
private int id;
public void setId(int id) {
this.id = id;
}
static public void aa(CTest f) {
f = new CTest();
f.setId(3);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
CTest f = null;
aa(f);
System.out.println(f == null);
}
}
答案是 true
package com.jo;
public class CTest {
private int id;
public void setId(int id) {
this.id = id;
}
static public void aa(CTest f) {
//f = new CTest();
f.setId(3);
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
CTest f = new CTest();
aa(f);
System.out.println(f.id == 3);
}
}
答案是 true
