java 类的继承和接口的继承

父类public class person {	 String name;	 int age;	 void eat(){		 System.out.println("吃饭");	 }	 void introduce(){		 System.out.println("我的名字是"+name +",我的年龄是"+age);	 }	 }

子类public class testper extends person { int grade; void study(){  System.out.println("学习,年级是"+this.grade); }}

测试下继承public class ss {public static void main(String[] args){  testper testper=new testper();  testper.grade=1;  testper.name="北京";  testper.age=10;  testper.eat();  testper.introduce();  testper.study(); }}

输出

java的继承只能是单继承。

java接口的继承

usb接口：

interface Useb { void read(); void write();}

wifi接口
public interface WiFi { public void open(); public void close();}

实现public class Usebpone implements Useb,WiFi{ public void read() {  System.out.println("useb read"); } public void write() {  System.out.println("useb write"); } public void open(){  System.out.println("wifi open"); } public void close() {  System.out.println("wifi open"); }}

测试public class test { public static void main(String agrs[]) {  Usebpone usbPhone=new Usebpone();  Useb sab=usbPhone;  sab.read();  sab.write();  WiFi wiFi=usbPhone;  wiFi.open();  wiFi.close(); }}

运行结果

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原标题：java 类的继承和接口的继承

关键词：JAVA