原型-设计模式

原型设计模式

原型模式应用场景：创建一个对象比较复杂，当前存在一个和需要创建的对象极其相似，我们就可以采用原型模式，在原来的对象上进行一个修改。
修改方案：在原来的基础上进行拷贝，在进行部分的修改。（具体采用深拷贝和浅拷贝根据具体的业务场景进行选择）就像我们写一段文本时，前面已经写过一段极其相似的文本，我们可以直接拷贝，然后进行修改。提高了写文本的效率。

package com.obstar.prototype;

public class MachineStatus {
    public String stable;

    public String getStable() {
        return stable;
    }

    public MachineStatus(String stable) {
        this.stable = stable;
    }

    public void setStable(String stable) {
        this.stable = stable;
    }

    @Override
    public String toString() {
        return "MachineStatus{" +
                "stable='" + stable + '\'' +
                '}';
    }
}
package com.obstar.prototype;

public class Machine implements Cloneable{
    private String model;
    private String speed;
    private String weight;
    private String power;
    private MachineStatus status;

    public Machine(String model, String speed, String weight, String power, MachineStatus status) {
        this.model = model;
        this.speed = speed;
        this.weight = weight;
        this.power = power;
        this.status = status;
    }

    public MachineStatus getStatus() {
        return status;
    }

    public void setStatus(MachineStatus status) {
        this.status = status;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public String getSpeed() {
        return speed;
    }

    public void setSpeed(String speed) {
        this.speed = speed;
    }

    public String getWeight() {
        return weight;
    }

    public void setWeight(String weight) {
        this.weight = weight;
    }


    public String getPower() {
        return power;
    }

    public void setPower(String power) {
        this.power = power;
    }

    @Override
    public String toString() {
        return "Machine{" +
                "model='" + model + '\'' +
                ", speed='" + speed + '\'' +
                ", weight='" + weight + '\'' +
                ", power='" + power + '\'' +
                ", status='" + status + '\'' +
                '}';
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Machine machine = (Machine)super.clone();
        MachineStatus machineStatus = new MachineStatus(this.status.stable);
        machine.setStatus(machineStatus);
        return machine;
    }
}

DEMO：

public class Demo {
    public static void main(String[] args) throws CloneNotSupportedException {
        Machine machine1 = new Machine("A19", "3600", "1000KG"
            ,"5000W", new MachineStatus("稳定"));

        Machine machine2 = (Machine) machine1.clone();
        machine2.setModel("A20");

        System.out.println(machine1);
        System.out.println(machine2);
    }
}