目录

1.继承Thread类

2.实现Runnab类

2.1实现Runnable类

2.2使用Lambda表达式

3.实现Callable类

3.1返回Integer类型数据

3.2返回String类型数据

3.3返回Object类型数据

4.匿名内部类

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创建线程的方法：继承Thread类；实现Runnab类；匿名内部类；实现Callable类

1.继承Thread类

/**继承Thread类*/
public class ThreadDemo extends Thread{public static void main(String[] args) {ThreadDemo threadDemo = new ThreadDemo();/**start() 启动当前线程；调用当前线程run()方法*/threadDemo.start();}/**重写run()*/@Overridepublic void run() {/**执行run()中间的任务*/int num =100;for (int i=1;i<=num;i++){if (i%2 ==0){System.out.println("1-100的偶数为：" + i);}}}
}

2.实现Runnab类

2.1实现Runnable类

/**实现Runnable类*/
public class ThreadDemo implements Runnable {public static void main(String[] args) {ThreadDemo threadDemo = new ThreadDemo();/**获取Thread对象，将自定义的ThreadDemo对象存进去*/Thread thread = new Thread(threadDemo);/**start() 启动当前线程；调用当前线程run()方法*/thread.start();}/**重写run()*/@Overridepublic void run() {/**执行run()中间的任务*/int num =100;for (int i=1;i<=num;i++){if (i%2 ==0){System.out.println("1-100的偶数为：" + i);}}}
}

 2.2使用Lambda表达式

/**Lambda表达式*/
public class ThreadDemo {public static void main(String[] args) {Thread thread = new Thread(() -> {int num = 20;for (int i = 1; i <= num; i++) {if (i % 2 != 0) {System.out.println("1-20的奇数为：" + i);}}});/**start() 启动当前线程；调用当前线程run()方法*/thread.start();}
}

/**Lambda表达式*/
public class ThreadDemo {public static void main(String[] args) {new Thread(() -> {/**执行->箭头后面的任务*/System.out.println("线程");}).start();}
}

3.实现Callable类

当 FutureTask 处于未启动或已启动状态时，执行 FutureTask.get()方法将导致调用线程阻塞。如果 FutureTask 处于已完成状态，调用FutureTask.get()方法将导致调用线程立即返回结果或者抛出异常。

3.1返回Integer类型数据

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;/**Callable方法*/
public class ThreadDemo implements Callable<Integer> {public static void main(String[] args) throws ExecutionException, InterruptedException {FutureTask<Integer> integerFutureTask = new FutureTask<>(new ThreadDemo());Thread thread = new Thread(integerFutureTask);thread.start();Integer result = integerFutureTask.get();System.out.println(result);}@Overridepublic Integer call() throws Exception {int sum = 0;for (int i = 1; i <= 10; i++){sum += i;}return sum;}
}

3.2返回String类型数据

/**Callable方法*/
public class ThreadDemo implements Callable<String> {public static void main(String[] args) throws ExecutionException, InterruptedException {FutureTask<String> stringFutureTask = new FutureTask<>(new ThreadDemo());Thread thread = new Thread(stringFutureTask);thread.start();/**输出 线程进行中 */String result = stringFutureTask.get();System.out.println(result);/**输出 Thread-0 *//*String name = thread.getName();*//*System.out.println(name);*/}@Overridepublic String call() throws Exception {return "线程进行中";}
}

3.3返回Object类型数据

public class User {private String name = "张三";private int age = 18;private String gender ="男";public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public User(String name, int age, String gender) {this.name = name;this.age = age;this.gender = gender;}public User() {}@Overridepublic String toString() {return "User{" +"name='" + name + '\'' +", age=" + age +", gender='" + gender + '\'' +'}';}
}

/**Callable方法*/
public class ThreadDemo implements Callable<Object> {public static void main(String[] args) throws ExecutionException, InterruptedException {FutureTask<Object> stringFutureTask = new FutureTask<>(new ThreadDemo());Thread thread = new Thread(stringFutureTask);thread.start();Object result = stringFutureTask.get();/**输出 User{name='张三', age=18, gender='男'}*/System.out.println(result);}@Overridepublic Object call() throws Exception {User user = new User();/** 返回 包名.类名@哈希码值(demo.User@135fbaa4)*//*return user;*//**返回 User{name='张三', age=18, gender='男'}*/return user.toString();}
}

4.匿名内部类

/**匿名内部类*/
public class ThreadDemo {public static void main(String[] args) {/**获取Thread对象，使用匿名内部类方式获取Runnable对象*/Thread thread = new Thread(new Runnable() {/**重写run()*/@Overridepublic void run() {/**执行run()中间的任务*/int num = 100;for (int i = 1; i <= num; i++) {if (i % 2 != 0) {System.out.println("1-100的奇数为：" + i);}}}});/**start() 启动当前线程；调用当前线程run()方法*/thread.start();}
}