靜態代理和裝飾模式的區別
擷取一篇文章裡的總結：代理模式主要是控制對某個特定物件訪問，而裝飾模式主要是為了給物件新增行為
代理模式：
定義一個測試介面，裡面定義一個測試用例執行方法
interface ITest{
void execute();
}
定義一個測試用例類，具體實現測試執行函式
class TestCase implements ITest{
public void execute(){
System.out.println("running testcase");
}
}
定一個測試者類，因為測試用例本身不能去執行當然要人去執行，所以認為測試者是代理測試用例執行的代理類，同樣實現具體execute方法，但是裡面加了一些邏輯，只有叫xiaoming的測試者才能執行測試用例。
class Tester implements ITest{
private ITest test;
private String testerName;
Tester(ITest test,String testerName){
this.test = test;
this.testerName = testerName;
}
public void execute(){
if(testerName == "xiaoming"){
System.out.println("I am xiaoming. I have permission to execute test.");
test.execute();
} else{
System.out.println("Sorry, only xiaoming has permission to execute test.");
}
}
}
主程式
public class MyProxy {
public static void main(String[] argv){
ITest test = new TestCase();
ITest tester1 = new Tester(test,"xiaoming");
tester1.execute();
ITest tester2 = new Tester(test,"xiaoxu");
tester2.execute();
}
測試結果：
I am xiaoming. I have permission to execute test.
running testcase
Sorry, only xiaoming has permission to execute test.
}
裝飾模式：
同樣定義測試介面
interface ITest{
void execute();
}
同樣定義一個測試用例類
class TestCase implements ITest{
public void execute(){
System.out.println("running testcase");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
定義一個時間裝飾類，列印測試用例執行的開始時間和結束時間
class TimeDecorator{
private ITest test;
TimeDecorator(ITest test){
this.test = test;
}
public void execute(){
Date date = new Date();
System.out.println("Case start time:" + date.toString());
test.execute();
date = new Date();
System.out.println("Case end time:" + date.toString());
}
}
測試：
public class MyDecorator {
public static void main(String[] args) {
ITest testcase = new TestCase();
TimeDecorator td = new TimeDecorator(testcase);
td.execute();
}
}
結果：
Case start time:Tue May 22 22:35:05 CST 2018
running testcase
Case end time:Tue May 22 22:35:07 CST 2018