public class User {
//姓名,年龄
String name;
int age;
//无参构造方法
public User(){
}
//有参构造方法
public User(String name ,int age){
this.name=name;
this.age=age;
}
public User(String name){
this.name=name;
}
public void show(){
System.out.println(name+"\t"+age);
}
}
public class Test {
public static void main(String[] args) {
//手动初始化
User user=new User();
user.name="yu";
user.age=30;
user.show();
//使用构造函数初始化
User user1 = new User("cao", 20);
user1.show();
}
}
結果:
yu 30
cao 20