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                #### 創建線程的兩種方式 ``` class MyThread extends Thread{ //指定線程名稱 public MyThread(String name) { super(name); } @Override public void run() { for (int i=0; i<100; i++){ System.out.println("i"+i); } } } ``` ``` class MyThread implements Runnable{ @Override public void run() { for (int i=0; i<100; i++){ System.out.println("i"+i); } } } ``` ``` 匿名內部類方式實現線程 Runnable r = new Runnable() { @Override public void run() { System.out.println(""); } }; new Thread(r).start(); ``` #### Thread和Runnable的區別 ``` 1. 如果一個類繼承Thread,則不適合資源共享 2. 如果實現了Runable接口的話,則很容易的實現資源共享 ``` ### Runnable的優勢 ``` 1. 適合多個相同的程序代碼的線程去共享同一個資源 2. 可以避免java中的單繼承的局限性 3. 增加程序的健壯性,實現解耦操作,代碼可以被多個線程共享,代碼和線程獨立 4. 線程池只能放入實現Runable或Callable類線程,不能直接放入繼承Thread的類 ``` 擴充 ``` 在java中,每次程序運行至少啟動2個線程 一個是main線程,一個是垃圾收集線程 因為每當使用 java命令執行一個類的時候,實際上都會啟動一個JVM,每一個JVM其實在就是在操作系統中啟動了一個進程 ```
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