GOF23設計模式——原型模式（深克隆）

/**
 * 測試對象
 * 
 * @author Administrator
 *
 */
public class Name implements Cloneable, Serializable{

    private static final long serialVersionUID = L;

    private String name;

    public String getName() {
        return name;
    }

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

    public Name clone() {
        try {
            return (Name)super.clone();
        } catch (CloneNotSupportedException e) {
            return null;
        }
    }
}
           

/**
 * 深克隆
 * 
 * @author Administrator
 *
 */
public class ProductByDeepClone implements Cloneable, Serializable{

    private static final long serialVersionUID = L;

    private String id;

    private Name name;

    private String[] part;


    public ProductByDeepClone(String id, Name name, String[] part) {
        super();
        this.id = id;
        this.name = name;
        this.part = part;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public Name getName() {
        return name;
    }

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

    public String[] getPart() {
        return part;
    }

    public void setPart(String[] part) {
        this.part = part;
    }

    /**
     *  深克隆
     */
    public ProductByDeepClone clone() {
        try {
            ProductByDeepClone p = (ProductByDeepClone)super.clone();
            p.name = this.name.clone();
            p.part = this.part.clone();
            return p;
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
            return null;
        }
    }
}
           

/**
 * 深克隆測試
 * 
 * @author Administrator
 *
 */
public class ClientByDeepClone {

    public static void main(String[] args) {
        String id = "1";
        Name name = new Name();
        name.setName("name1");
        String[] part = { "part1", "part2" };
        ProductByDeepClone p1 = new ProductByDeepClone(id, name, part);
        System.out.println("首次指派");
        System.out.println(p1);
        System.out.println(p1.getId());
        System.out.println(p1.getName().getName());
        System.out.println(p1.getPart()[]);
        System.out.println();

        // 克隆
        System.out.println("克隆後的值");
        ProductByDeepClone p2 = (ProductByDeepClone) p1.clone();
        System.out.println(p2);
        System.out.println(p2.getId());
        System.out.println(p2.getName().getName());
        System.out.println(p2.getPart()[]);
        System.out.println();

        id = "2";
        name.setName("name2");
        part[] = "part21";

        // 給原對象重新指派後原先的對象的值
        System.out.println("給原對象重新指派後原先的對象的值");
        System.out.println(p1);
        System.out.println(p1.getId());
        System.out.println(p1.getName().getName());
        System.out.println(p1.getPart()[]);
        System.out.println();

        System.out.println("給原對象重新指派後新的對象的值");
        System.out.println(p2);
        System.out.println(p2.getId());
        System.out.println(p2.getName().getName());
        System.out.println(p2.getPart()[]);
        System.out.println();
    }
}
           

測試結果：

首次指派
com.suntefan.model.prototype.ProductByDeepClone@7852e922

name1
part1

克隆後的值
com.suntefan.model.prototype.ProductByDeepClone@4e25154f

name1
part1

給原對象重新指派後原先的對象的值
com.suntefan.model.prototype.ProductByDeepClone@7852e922

name2
part21

給原對象重新指派後新的對象的值
com.suntefan.model.prototype.ProductByDeepClone@4e25154f

name1
part1