1.繼承Thread類

2.實現implement介面

3.實現Callable介面

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class testCallable {
    public static void main(String[] args) {
        Test test = new Test();
        //呼叫Callable需要構造一個FutureTast裝載實現Callable的類
 

        FutureTask<Integer> futureTask = new FutureTask<>(test);
        //FutureTask繼承了Runnable介面
        Thread t = new Thread(futureTask);
        t.start();

        try {
            //可通過get()方法獲取執行緒返回的值
            //try/catch捕獲異常
            System.out.println(futureTask.get());;
        } 
 
catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }
}
//實現Callable介面
class Test implements Callable<Integer>{

    //重寫call方法，相比run方法更加強大，
    //能返回值和丟擲異常
    @Override
    public Integer call() throws Exception {
        int sum=0;
        for (int i = 1; i <=100; i++) {
            System.out.println(i);
            sum
 
+=i;
        }
        return sum;
    }

}