方法的重写
1、在子类中可以根据需要对从基类中继承的方法进行重写
2、重写方法必须和被重写方法具有相同对的方法名称,相同的参数列表和返回值类型
3、重写方法不能使用比被重写方法更严格的访问权限
在方法重写的时候注意:对那个方法进行重写尽量copy那个方法,如果在重写
getInfo这个方法时,不小心写成了GetInfo当编译的时候,不会报错,但是得不到你想要的结果
例如:
class Person {private String name;private int age;public void setName(String name){this.name=name;}public void setAge(int age) {this.age=age;}public String getName(){return name;}public int getAge(){return age;}public String getInfo() {return "Name: "+ name + "\n" +"age: "+ age;}
}class Student extends Person {private String school;public String getSchool() {return school;}public void setSchool(String school){this.school =school;}public String getInfo() {return "Name: "+ getName() + "\nage: "+ getAge() + "\nschool: "+ school;}
}public class TestOverWrite {
public static void main(String arg[]){Student student = new Student();Person person = new Person();person.setName("none");person.setAge(1000);student.setName("John"); student.setAge(18);student.setSchool("SCH");System.out.println(person.getInfo());System.out.println(student.getInfo());}
}
posted on 2018-12-24 16:27 雪地里的Alan 阅读(...) 评论(...) 编辑 收藏