Jave:接口

Shape

package com.wanson.HandleInterface;

/**
 * 接口就是一种公共的规范标准。
 * 只要符合规范标准，就可以大家通用。
 * 接口interface一种引用数据类型，其中抽象方法是关注要点
 */
public interface Shape {
    // 以下都是抽象方法
/*    public abstract void methodAbs1();
    abstract void methodAbs2();
    public void methodAbs3();
    void methodAbs4();*/

    public double getArea();

    public double getCircumference();

//    默认方法 :目的是解决 接口升级的问题
    public default void getInfomation(){
        System.out.println("这是新添加方法");
    }

    public static void getVIPInformation(){
        System.out.println("VIP信息");
    }

}

Animals

package com.wanson.HandleInterface;

public interface Animals {

    // 接口默认方法
    public default void getAnimalName(){
        System.out.println("动物品种");
        printStart();
    }

    // 接口静态方法
    public static void getExtraFullInfomation(){
        System.out.println("获取额外信息");
        printStart();
    }

    private static void printStart(){
        for (int i = 0; i <50 ; i++) {
            System.out.print("\t"+"*");
        }
    }



}

Cat

package com.wanson.Cat;

import com.wanson.HandleInterface.Animals;
import com.wanson.HandleInterface.Shape;

public class Cat implements Animals {

}

Rectangle

package com.wanson.Rectangle;

import com.wanson.HandleInterface.Shape;

public class Rectangle implements Shape {
    private double width;
    private double height;

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public double getArea() {
        System.out.println("面积信息:\t");
        return width*height;
    }

    public double getCircumference() {
        System.out.println("周长信息:\t");
        return (width+height)*2;
    }

    @Override
    public void getInfomation() {
        System.out.println("正方形");
    }
}

测试

package com.wanson.HandleInterface.test;

import com.wanson.Cat.Cat;
import com.wanson.HandleInterface.Animals;
import com.wanson.HandleInterface.Shape;
import com.wanson.Rectangle.Rectangle;

public class Driver {
    public static void main(String[] args) {

        Cat cat=new Cat();
        cat.getAnimalName();

        Rectangle rectangle=new Rectangle();
        System.out.println(rectangle.getArea());
        System.out.println(rectangle.getCircumference());
        rectangle.getInfomation();

        Shape.getVIPInformation();
        Animals.getExtraFullInfomation();



    }

}