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  • Java 实现原型(Prototype)模式

    public class BaseSpoon implements Cloneable {//spoon 匙, 调羹 
    	String name;
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    	
    	@Override
    	protected BaseSpoon clone() throws CloneNotSupportedException {
    		System.out.println("clone a BaseSpoon");
    		BaseSpoon object = null;
    		try {
    			object = (BaseSpoon) super.clone();
    		} catch (CloneNotSupportedException e) {
    			e.printStackTrace();
    			System.err.println("BaseSpoon is not Cloneable");
    		}
    		return object;
    	}
    }

    public class SaladSpoon extends BaseSpoon {
    	
    	public SaladSpoon() {
    		setName("Salad Spoon");//沙拉 匙
    	}
    }
    

    public class SoupSpoon extends BaseSpoon {
    	
    	public SoupSpoon() {
    		setName("Soup Spoon");//汤匙
    	}
    }
    

    /*
     * 原型模式
     * 用原型实例指定创建对象的种类。而且通过拷贝这些原型创建新的对象。

    * Prototype原型模式是一种创建型设计模式。Prototype模式同意一个对象再创建另外一个可定制的对象,根本无需知道不论什么怎样创建的细节, * 工作原理是:通过将一个原型对象传给那个要发动创建的对象,这个要发动创建的对象通过请求原型对象拷贝它们自己来实施创建。 * 在java中 体现为 clone() 对象 */ public class Test { public static void main(String[] args) throws CloneNotSupportedException { //创建原型 BaseSpoon soup1 = new SoupSpoon(); BaseSpoon salad1 = new SaladSpoon(); //clone原型 得到新对象 SoupSpoon soup2 = (SoupSpoon) soup1.clone(); SaladSpoon salad2 = (SaladSpoon) salad1.clone(); //输出clone后原型和相应新对象的名字 System.out.println("clone 后:" + soup1.getName() + "-" + soup2.getName()); System.out.println("clone 后:" + salad1.getName() + "-" + salad2.getName()); soup1.setName("soup1 spoon"); salad1.setName("salad1 spoon"); soup2.setName("soup2 spoon"); salad2.setName("salad2 spoon"); System.out.println("属性又一次赋值后:" + soup1.getName() + "-" + soup2.getName()); System.out.println("属性又一次赋值后:" + salad1.getName() + "-" + salad2.getName()); } }




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  • 原文地址:https://www.cnblogs.com/gavanwanggw/p/6803033.html
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