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在Java中，有三种方式创建多线程，继承类Thread，继承接口Runnable，继承接口Callable。其中Thread和Runnable需要重写方法run，方法run没有返回值；Callable需要重写方法call，方法call可以返回值。

Thread实现如下：

package ch01;/*** @copyright 2003-2024* @author    qiao wei* @date      2024-01-04 15:47* @version   1.0* @brief     * @history   */
public class MyThread extends Thread {@Overridepublic void run() {super.run();for (int index = 0; 100 != index; ++ index) {System.out.println("----------子线程：" + index + ", " + Thread.currentThread().threadId());}}
}

Runnable实现如下：

package ch01;/*** @copyright 2003-2024* @author    qiao wei* @date      2024-01-04 15:58* @version   1.0* @brief     * @history   */
public class MyRunnable implements Runnable {public MyRunnable() {}@Overridepublic void run() {for (int index = 0; 100 != index; ++ index) {System.out.println("----------子线程：" + index + ", " + Thread.currentThread().threadId());}}
}

Callable实现如下：

package ch01;import java.util.concurrent.Callable;/*** @copyright 2003-2024* @author    qiao wei* @date      2024-01-04 16:21* @version   1.0* @brief     继承接口Callable进行多线程。* @history   */
public class MyCallable implements Callable<String> {public MyCallable(int count) {this.count = count;}/*** @author  qiao wei* @brief   通过程序处理，返回响应值。* @param   * @return  返回处理后的Integer数据。* @throws  */@Overridepublic String call() throws Exception {int sum = 0;for (int index = 0; index != count; ++index) {sum += index;}// 有返回值。return Integer.toString(sum);}private int count;
}