原型模式（Prototype），用原型例項指定建立物件的種類，並通過拷貝這些原型建立新的物件。

圖示程式碼：

 1 public abstract class Prototype {
 2     private String id;
 3     
 4     public Prototype(String id) {
 5         this.id = id;
 6     }
 7 
 8     public String getId() {
 9         return id;
10     }
11 
12     public void setId(String id) {
 
13         this.id = id;
14     }
15     
16     public abstract Prototype clone();
17     
18 }

 1 public class ConcretePrototype1 extends Prototype {
 2 
 3     public ConcretePrototype1(String id) {
 4         super(id);
 5     }
 6 
 7     @Override
 8     public Prototype clone() {
 
 9         Prototype pt= new ConcretePrototype1(this.getId());
10         return pt;
11     }
12 
13 }

 1 public class ConcretePrototype2 extends Prototype {
 2 
 3     public ConcretePrototype2(String id) {
 4         super(id);
 5     }
 6 
 7     @Override
 8     public Prototype clone() {
 
 9         Prototype pt= new ConcretePrototype2(this.getId());
10         return pt;
11     }
12 
13 }

1 public class TestPrototype {
2     public static void main(String[] args) {
3         ConcretePrototype1 c1 = new ConcretePrototype1("I");
4         ConcretePrototype1 p1 = (ConcretePrototype1) c1.clone();
5         System.out.println(p1.getId());
6     }
7 }