내식 교체 원칙

import java.util.HashMap;
import java.util.Map;

/**
 *       
 */
public class LiskovSubstitution {
    private static void resize(Rectangle rectangle) {
        while (rectangle.getWidth() <= rectangle.getLength()) {
            rectangle.setWidth(rectangle.getWidth() + 1);
            System.out.println(rectangle);
        }
        System.out.println("resize    ：" + rectangle);
    }

    public static void main(String[] args) {
//        Rectangle rectangle = new Rectangle();
//        rectangle.setWidth(10);
//        rectangle.setLength(20);
//        resize(rectangle);

//        Square square = new Square();
//        square.setSideLength(10);
//        resize(square);

//        Base child = new Child();
//        child.method(new HashMap());

        Child1 child1 = new Child1();
        System.out.println(child1.method());
    }
}

interface Quadrangle {
    long getWidth();

    long getLength();
}

/**
 *    
 */
class Rectangle implements Quadrangle {
    private long length;
    private long width;

    @Override
    public long getWidth() {
        return this.width;
    }

    @Override
    public long getLength() {
        return this.length;
    }

    public void setLength(long length) {
        this.length = length;
    }

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

    @Override
    public String toString() {
        return "Rectangle{" +
                "length=" + length +
                ", width=" + width +
                '}';
    }
}

/**
 *    
 */
class Square implements Quadrangle {
    private long sideLength;

    public long getSideLength() {
        return sideLength;
    }

    public void setSideLength(long sideLength) {
        this.sideLength = sideLength;
    }

    @Override
    public long getLength() {
        return this.getSideLength();
    }

    @Override
    public long getWidth() {
        return this.getSideLength();
    }

    @Override
    public String toString() {
        return "Square{" +
                "length=" + this.getLength() +
                ", width=" + this.getWidth() +
                '}';
    }
}

/**
 *              ，       （      ）              
 */
class Base {
    public void method(HashMap map) {
        System.out.println("     ");
    }
}

class Child extends Base {
//    @Override
//    public void method(HashMap map) {
//        System.out.println("  HahsMap       ");
//    }

    public void method(Map map) {
        System.out.println("  Map       ");
    }
}

/**
 *               （  ，         ），       （    ）           
 */
abstract class Base1 {
    public abstract Map method();
}

class Child1 extends Base1 {

    @Override
    public HashMap method() {
        HashMap hashMap = new HashMap();
        System.out.println("  method   ");
        hashMap.put("message", "  method   ");
        return hashMap;
    }
}