Java Design Pattern: Prototype

最新推荐文章于 2021-03-13 17:21:10 发布

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最新推荐文章于 2021-03-13 17:21:10 发布

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本文详细介绍了原型设计模式的原理与应用，通过实例展示了如何利用此模式减少资源消耗，以及其在Java标准库中的实际应用。文章还探讨了模式在不同场景下的优势，并提供了与之相关的其他设计模式供读者参考。

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By X Wang

Prototype design pattern is used when very similar objects frequently are required. Prototype pattern clones objects and set the changed feature. This way less resources are consumed. Think about why less resources are consumed?

1. Prototype Pattern Class Diagram

2. Prototype Pattern Java Example

<span style="font-size:18px;">package designpatterns.prototype;
 
//prototype
interface Prototype {
    void setSize(int x);
    void printSize();
 }
 
// a concrete class
class A implements Prototype, Cloneable {
    private int size;
 
    public A(int x) {
        this.size = x;
    }
 
    @Override
    public void setSize(int x) {
        this.size = x;
    }
 
    @Override
    public void printSize() {
        System.out.println("Size: " + size);
    }
 
 
    @Override
    public A clone() throws CloneNotSupportedException {
        return (A) super.clone();
    }
}
 
//when we need a large number of similar objects
public class PrototypeTest {
    public static void main(String args[]) throws CloneNotSupportedException {
        A a = new A(1);
 
        for (int i = 2; i < 10; i++) {
            Prototype temp = a.clone();
            temp.setSize(i);
            temp.printSize();
        }
    }
}</span>

3. Prototype Design Pattern Used in Java Standard Library

java.lang.Object - clone()