代理模式Proxy_JAVA_编程开发_程序员俱乐部

代理模式Proxy

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class="java" name="code">/**
 * 抽象主题角色
 * @author InJavaWeTrust
 */
public abstract class Emperor {
	
	public abstract void say();

}

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/**
 * 真实主题角色
 * @author InJavaWeTrust
 */
public class EmperorLingofHan extends Emperor {
	
	private String decree = "曹阿瞒是汉賊";
	
	public EmperorLingofHan(String decree) {
		this.decree = decree;
	}

	@Override
	public void say() {
		System.out.println(this.decree);
	}

}

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/**
 * 代理主题角色
 * @author InJavaWeTrust
 */
public class TraitorCao extends Emperor {
	
	private String decree = "曹操匡扶汉室";
	
	private EmperorLingofHan emperor;
	
	public TraitorCao() {
		
	}

	@Override
	public void say() {
		preRequest();
		if (emperor == null) {
			emperor = new EmperorLingofHan(this.decree);
		}
		emperor.say();
		afterRequest();
	}
	
	private void preRequest() {
		
	}
	
	private void afterRequest() {
		
	}

}

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/**
 * 测试类
 * @author InJavaWeTrust
 */
public class TestProxy {
	
	public static void main(String[] args) {
		Emperor emperor = new TraitorCao();
		emperor.say();
	}

}

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