18 原型模式（原型设计模式）详解

​

//具体原型类
class Realizetype implements Cloneable {
    Realizetype() {
        System.out.println("具体原型创建成功！");
    }

    public Object clone() throws CloneNotSupportedException {
        System.out.println("具体原型复制成功！");
        return (Realizetype) super.clone();
    }
}

//原型模式的测试类
public class PrototypeTest {
    public static void main(String[] args) throws CloneNotSupportedException {
        Realizetype obj1 = new Realizetype();
        Realizetype obj2 = (Realizetype) obj1.clone();
        System.out.println("obj1==obj2?" + (obj1 == obj2));
    }
}

​

import java.awt.*;
import javax.swing.*;

class SunWukong extends JPanel implements Cloneable {
    private static final long serialVersionUID = 5543049531872119328L;

    public SunWukong() {
        JLabel l1 = new JLabel(new ImageIcon("src/Wukong.jpg"));
        this.add(l1);
    }

    public Object clone() {
        SunWukong w = null;
        try {
            w = (SunWukong) super.clone();
        } catch (CloneNotSupportedException e) {
            System.out.println("拷贝悟空失败!");
        }
        return w;
    }
}

public class ProtoTypeWukong {
    public static void main(String[] args) {
        JFrame jf = new JFrame("原型模式测试");
        jf.setLayout(new GridLayout(1, 2));
        Container contentPane = jf.getContentPane();
        SunWukong obj1 = new SunWukong();
        contentPane.add(obj1);
        SunWukong obj2 = (SunWukong) obj1.clone();
        contentPane.add(obj2);
        jf.pack();
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

​

​

public class ProtoTypeCitation {
    public static void main(String[] args) throws CloneNotSupportedException {
        citation obj1 = new citation("张三", "同学：在2016学年第一学期中表现优秀，被评为三好学生。", "韶关学院");
        obj1.display();
        citation obj2 = (citation) obj1.clone();
        obj2.setName("李四");
        obj2.display();
    }
}

//奖状类
class citation implements Cloneable {
    String name;
    String info;
    String college;

    citation(String name, String info, String college) {
        this.name = name;
        this.info = info;
        this.college = college;
        System.out.println("奖状创建成功！");
    }

    void setName(String name) {
        this.name = name;
    }

    String getName() {
        return (this.name);
    }

    void display() {
        System.out.println(name + info + college);
    }

    public Object clone() throws CloneNotSupportedException {
        System.out.println("奖状拷贝成功！");
        return (citation) super.clone();
    }
}

​

​

import java.util.*;

interface Shape extends Cloneable {
    public Object clone();    //拷贝

    public void countArea();    //计算面积
}

class Circle implements Shape {
    public Object clone() {
        Circle w = null;
        try {
            w = (Circle) super.clone();
        } catch (CloneNotSupportedException e) {
            System.out.println("拷贝圆失败!");
        }
        return w;
    }

    public void countArea() {
        int r = 0;
        System.out.print("这是一个圆，请输入圆的半径：");
        Scanner input = new Scanner(System.in);
        r = input.nextInt();
        System.out.println("该圆的面积=" + 3.1415 * r * r + "n");
    }
}

class Square implements Shape {
    public Object clone() {
        Square b = null;
        try {
            b = (Square) super.clone();
        } catch (CloneNotSupportedException e) {
            System.out.println("拷贝正方形失败!");
        }
        return b;
    }

    public void countArea() {
        int a = 0;
        System.out.print("这是一个正方形，请输入它的边长：");
        Scanner input = new Scanner(System.in);
        a = input.nextInt();
        System.out.println("该正方形的面积=" + a * a + "n");
    }
}

class ProtoTypeManager {
    private HashMap<String, Shape> ht = new HashMap<String, Shape>();

    public ProtoTypeManager() {
        ht.put("Circle", new Circle());
        ht.put("Square", new Square());
    }

    public void addshape(String key, Shape obj) {
        ht.put(key, obj);
    }

    public Shape getShape(String key) {
        Shape temp = ht.get(key);
        return (Shape) temp.clone();
    }
}

public class ProtoTypeShape {
    public static void main(String[] args) {
        ProtoTypeManager pm = new ProtoTypeManager();
        Shape obj1 = (Circle) pm.getShape("Circle");
        obj1.countArea();
        Shape obj2 = (Shape) pm.getShape("Square");
        obj2.countArea();
    }
}