1.继承thread（重写run）
public class ThreadDemo {public static void main(String[] args) {TestThread t1 = new TestThread("thread1");TestThread t2 = new TestThread("thread2");t1.start();t2.start();}
}class TestThread extends Thread {String name;public TestThread(String name) {this.name = name;}@Overridepublic void run() {for (int i = 0; i < 100; i++) {System.out.println(this.name + ":" + i);}}
}
Thread的run和start有什么区别
run()方法：
是在主线程中执行方法，和调用普通方法一样；（按顺序执行，同步执行）
start()方法：
是创建了新的线程，在新的线程中执行；（异步执行）
2.实现runnable（重写run）
package test;public class RunnableDemo {public static void main(String[] args) {TestRunnable r1 = new TestRunnable("runnable-1");TestRunnable r2 = new TestRunnable("runnable-2");r1.start();r2.start();}
}class TestRunnable implements Runnable {String name;Thread thread;public TestRunnable(String name) {this.name = name;}@Overridepublic void run() {for (int i = 0; i < 100; i++) {System.out.println(this.name + ":" + i);}}public void start() {System.out.println("Starting " + this.name);if (thread == null) {thread = new Thread(this, this.name);thread.start();}}
}3.匿名内部类（重写run）
package test;public class test3 {public static void main(String[] args) {System.out.println("-----多线程创建开始-----");Thread thread = new Thread(new Runnable() {public void run() {for (int i = 0; i< 100; i++) {System.out.println("i:" + i);}}});Thread thread2 = new Thread(new Runnable() {public void run() {for (int i = 0; i< 100; i++) {System.out.println("j:" + i);}}});thread.start();thread2.start();System.out.println("-----多线程创建结束-----");}}
4.Callable（重写run）
package test;import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;/*** callable*/
public class CallableDemo {static class MyThread implements Callable<String> {@Overridepublic String call() throws Exception {return "Hello world";}}static class MyRunnable implements Runnable {@Overridepublic void run() {}}public static void main(String[] args) {ExecutorService threadPool = Executors.newSingleThreadExecutor();Future<String> future = threadPool.submit(new MyThread());try {System.out.println(future.get());} catch (Exception e) {} finally {threadPool.shutdown();}}
}