继承的格式： class 子类名 extends 父类名{}

如何使用继承：属于同一种类的事物和方法，可以归于同一种类

1package debug; 2 3class Person{ 4publicstaticvoid eat(){ 5System.out.println("吃饭"); 6 } 7 8publicstaticvoid sleep(){ 9System.out.println("睡觉"); 10 }1112}1314classStudentextends Person {1516 }171819classTeacherextends Person {2021 }2223publicclass ExtendDemo {24publicstaticvoid main(String[] args) {25Student s =new Student();26 s.eat();27 s.sleep();2829Teacher t =new Teacher();30 t.eat();31 t.sleep();32 }33}