public class Demo2 {
public static void main(String[] args) {
Person p1 = new Person();
Person p2 = new Person("黄蓉");
Person p3 = new Person("杨过",18);
p1.tell();
p2.tell();
p3.tell();
}
}
class Person{
private String name;
private int age ;
public Person(){System.out.println("无参构造器");}
public Person(String name){
System.out.println("有一个参数的构造器");
}
public Person(String name,int age ){
this.name = name;
this.age = age ;
System.out.println("有两个参数的构造器");
}
//以后只要是属性就必须封装,后必须通过setter和getter设置和获取
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
if(age>0&&age<150){ //设置合法年龄
this.age = age;
}
}
public void tell(){ //定义一个说话的方法
System.out.println("姓名:"+name+','+"年龄:"+age);
}
};