主方法 MainTest.java

package com.example.mythread;import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;public class MainTest {public static void main(String[] data){
//        以下的方法的线程并发执行//执行线程一ExtendsThread extendsThread = new ExtendsThread();// 1.执行线程中的方法extendsThread.getData();// 2. 或者 启动线程extendsThread.start();try {Thread.sleep(1000);} catch (InterruptedException e) {throw new RuntimeException(e);}//执行线程二Runnable runnable = new RunnableThread();Thread thread2 = new Thread(runnable);//1 启动线程thread2.start();//执行线程三 实现Callable接口和Future创建线程Callable<String> callable = new CallableThread();FutureTask<String> futureTask = new FutureTask<>(callable);Thread thread3 = new Thread(futureTask);thread3.start();try {//获取线程返回值System.out.println(futureTask.get());} catch (Exception e) {e.printStackTrace();}try {Thread.sleep(1000);} catch (InterruptedException e) {throw new RuntimeException(e);}// Lambda表达式简化写法//扩展 函数式接口 创建线程Thread thread4 = new Thread(() ->{System.out.println("扩展函数式接口的输出");});thread4.start();//扩展 Runnable函数式接口 创建线程Runnable runnable2 =()->{System.out.println("扩展Runnable函数式接口的输出");};new Thread(runnable2).start();// 扩展 Callable 函数式接口Callable<String> c = () ->{System.out.println("扩展线程开始运行");//线程暂停3秒 表示业务处理啥的Thread.sleep(3000);System.out.println("扩展线程执行完成");return "Callable接口实现返回的字符串";};//启动线程//new Thread(new FutureTask<String>(c)).start();FutureTask<String> futureTask2 = new FutureTask<String>(c);new Thread(futureTask2).start();try {//输出返回数据System.out.println(futureTask2.get());} catch (Throwable e) {e.printStackTrace();}//new Thread(){@Overridepublic void run() {super.run();System.out.println("线程中的输出");}}.start();}
}

方式一：写个类继承Thread  ExtendsThread.java

package com.example.mythread;
// 方式一 写个类 extends Thread
public class ExtendsThread extends Thread{@Overridepublic void run() {super.run();//调用方法getData();}public void getData(){System.out.println("方式一：我是线程中的输出");}
}

方式二： 写个类实现 Runnable接口  RunnableThread.java

package com.example.mythread;
//创建线程方式二 实现 Runnable  接口
public class RunnableThread implements Runnable{@Overridepublic void run() {//调用方法getData();}public void getData(){System.out.println("方式二：我是线程中的输出");}
}

 方式三 写个类实现Callable接口和Future创建线程  CallableThread.java

package com.example.mythread;import java.util.concurrent.Callable;// 方式三 实现Callable接口和Future创建线程
public class CallableThread implements Callable<String> {@Overridepublic String call() throws Exception {getData();return "要返回的数据";}public void getData(){System.out.println("方式三：我是线程中的输出");}
}