Java Thread 執行緒的建立

繼承 Thread 類別

public class ThreadA extends Thread {
    

    public void run() {
        System.out.println("A");
    }
}

執行

Thread a = new ThreadA();
a.start();

實作 Runnable 介面

public class ThreadB implements Runnable {
    
    public void run() {
        System.out.println("B");
    }

}

執行

Thread b = new Thread(new ThreadB());
b.start();

匿名內部類別

new Thread(new Runnable() {
    public void run() {
        System.out.println("C");
    }
}).start();

// Lambda
new Thread(() -> {
    System.out.println("D");
}).start();

Thread Pool

節省效能

ExecutorService ex = Executors.newSingleThreadExecutor();
ex.execute(new Runnable() {
    public void run() {
        System.out.println("E");
    }
});
ex.shutdown(); //要記得關閉
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