原型模式和迭代器模式稚失，使用場景比較特殊鸣皂，原型模式就是用來clone 對象的瞪讼，假設(shè)對象很多屬性要賦值瞻坝，new 一個對象就需要一個個填寫屬性蛛壳，當(dāng)然你也可以ctrl +c

public class Thing implements Cloneable {
    private String name=null;

    public Thing(String name) {
        this.name = name;
    }

    @Override
    protected Thing clone() throws CloneNotSupportedException {

        return (Thing) super.clone();
    }

    @Override
    public String toString() {
        return "Thing{" +
                "name='" + name + '\'' +
                '}';
    }

    public String getName() {
        return name;
    }

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

public class Client {
    public static void main(String[] args) {
        Thing hello = new Thing("hello");
        try {
            Thing clone = hello.clone();
            System.err.println(clone);
            clone.setName("wo");
            System.err.println(hello);
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
}

有個主意地方，克隆時候如果是基本類型和String對象，他是直接拷貝衙荐，遇到引用類型他是淺拷貝捞挥，拷貝的只是引用，改了副本改了值還是會關(guān)聯(lián)到原本

public class Thing implements Cloneable {
    private String name=null;
    private ArrayList<String> stringList=new ArrayList<>();

    public Thing(String name) {
        this.name = name;
    }

    @Override
    public Thing clone() throws CloneNotSupportedException {

        Thing clone1 = (Thing) super.clone();
        clone1.stringList = (ArrayList<String>) this.stringList.clone();
        return clone1;

    }


    public void addString(String string){
        stringList.add(string);
    }


    @Override
    public String toString() {
        return "Thing{" +
                "name='" + name + '\'' +
                '}';
    }

    public String getName() {
        return name;
    }

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

public class Client {
    public static void main(String[] args) {
        Thing hello = new Thing("hello");
        hello.addString("AAA");
        try {
            Thing clone = hello.clone();
            System.err.println(clone);
            clone.setName("wo");
            clone.addString("BBBB");
            System.err.println(hello);
            //-------------------------------

        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
}

上面例子測試了淺拷貝和深拷貝忧吟，ArrayList 要引用砌函，不能用List,List沒實(shí)現(xiàn)clone 接口