先创建一个Person 类
public class Person {
int age;
String name;
//空构造器
public Person() {
}
public Person(int age, String name) {
this.age = age;
this.name = name;
}
}
在创建一个Student类
public class Student extends Person{
int score;
//空构造器
public Student() {
super();//实际上每个构造器里都有一个这
}
public Student(int score) {
this.score = score;
}
public Student(int age, String name, int score) {
// this.age=age;//这个也可以
// this.name=name;
// super.age=age;//最传统最便于理解的方法
// super.name=name;
//super(); //super调用构造器只能调一次
super(age, name);//利用super调用父类构造器
this.score = score;
//this(score);//会报错,this和super只能出现一个
}
}
接着创建Test类
public class Test {
public static void main(String[] args) {
Student s1=new Student(12);
Student s2=new Student(18,"lxl",100);
}
}



