【并发编程】Java创建多线程的五种方式
1. 继承Thread类
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
/**
* 继承Thread类创建多线程单元测试
*
* @author CL
*/
@Slf4j
public class ThreadTest {
@Test
public void testThread() {
for (int i = 1; i <= 5; i++) {
new MyThread("thread-" + i).start();
}
}
/**
* 创建线程
*/
class MyThread extends Thread {
public MyThread(String name) {
super(name);
}
@Override
public void run() {
log.info(Thread.currentThread().getName() + " 正在执行任务...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
控制台打印：
21:41:48.690 [thread-1] INFO com.c3stones.test.MyThread - thread-1 正在执行任务...
21:41:48.690 [thread-3] INFO com.c3stones.test.MyThread - thread-3 正在执行任务...
21:41:48.690 [thread-5] INFO com.c3stones.test.MyThread - thread-5 正在执行任务...
21:41:48.690 [thread-4] INFO com.c3stones.test.MyThread - thread-4 正在执行任务...
21:41:48.690 [thread-2] INFO com.c3stones.test.MyThread - thread-2 正在执行任务...
2. 实现Runnable接口（包含Java8 Lambda方式）
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
/**
* 实现Runnable接口创建多线程单元测试
*
* @author CL
*/
@Slf4j
public class RunnableTest {
@Test
public void testRunnable() {
MyRunnable myRunnable = new MyRunnable();
for (int i = 1; i <= 5; i++) {
new Thread(myRunnable, "thread-" + i).start();
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
// java8 lambda方式
for (int i = 1; i <= 5; i++) {
new Thread(() -> {
log.info(Thread.currentThread().getName() + " 正在执行任务...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}, "lambda-thread-" + i).start();
}
}
/**
* 创建线程
*/
class MyRunnable implements Runnable {
@Override
public void run() {
log.info(Thread.currentThread().getName() + " 正在执行任务...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
控制台打印：
21:44:56.808 [thread-1] INFO com.c3stones.test.MyRunnable - thread-1 正在执行任务...
21:44:56.807 [thread-2] INFO com.c3stones.test.MyRunnable - thread-2 正在执行任务...
21:44:56.807 [thread-4] INFO com.c3stones.test.MyRunnable - thread-4 正在执行任务...
21:44:56.808 [thread-5] INFO com.c3stones.test.MyRunnable - thread-5 正在执行任务...
21:44:56.808 [thread-3] INFO com.c3stones.test.MyRunnable - thread-3 正在执行任务...
21:44:58.899 [lambda-thread-3] INFO com.c3stones.test.RunnableTest - lambda-thread-3 正在执行任务...
21:44:58.899 [lambda-thread-1] INFO com.c3stones.test.RunnableTest - lambda-thread-1 正在执行任务...
21:44:58.900 [lambda-thread-4] INFO com.c3stones.test.RunnableTest - lambda-thread-4 正在执行任务...
21:44:58.900 [lambda-thread-2] INFO com.c3stones.test.RunnableTest - lambda-thread-2 正在执行任务...
21:44:58.900 [lambda-thread-5] INFO com.c3stones.test.RunnableTest - lambda-thread-5 正在执行任务...
3. 实现Callable接口（包含Java8 Lambda方式）
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
/**
* 实现Callable接口创建多线程单元测试
*
* @author CL
*/
@Slf4j
public class CallableTest {
@Test
public void testCallable() {
MyCallable myCallable = new MyCallable();
for (int i = 1; i <= 5; i++) {
FutureTask<String> futureTask = new FutureTask<>(myCallable);
new Thread(futureTask, "thread-" + i).start();
try {
String result = futureTask.get();
log.info("thread-" + i + " 返回结果：" + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
// java8 lambda方式
for (int i = 1; i <= 5; i++) {
FutureTask<String> futureTask = new FutureTask<>(() -> {
log.info(Thread.currentThread().getName() + " 正在执行任务...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return Thread.currentThread().getName();
});
new Thread(futureTask, "lambda-thread-" + i).start();
try {
String result = futureTask.get();
log.info("lambda-thread-" + i + " 返回结果：" + result);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
}
/**
* 创建线程
*/
class MyCallable implements Callable<String> {
@Override
public String call() {
log.info(Thread.currentThread().getName() + " 正在执行任务...");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return Thread.currentThread().getName();
}
}
}
控制台打印：
21:46:31.805 [thread-1] INFO com.c3stones.test.MyCallable - thread-1 正在执行任务...
21:46:32.818 [main] INFO com.c3stones.test.CallableTest - thread-1 返回结果：thread-1
21:46:32.819 [thread-2] INFO com.c3stones.test.MyCallable - thread-2 正在执行任务...
21:46:33.820 [main] INFO com.c3stones.test.CallableTest - thread-2 返回结果：thread-2
21:46:33.821 [thread-3] INFO com.c3stones.test.MyCallable - thread-3 正在执行任务...
21:46:34.822 [main] INFO com.c3stones.test.CallableTest - thread-3 返回结果：thread-3
21:46:34.822 [thread-4] INFO com.c3stones.test.MyCallable - thread-4 正在执行任务...
21:46:35.822 [main] INFO com.c3stones.test.CallableTest - thread-4 返回结果：thread-4
21:46:35.822 [thread-5] INFO com.c3stones.test.MyCallable - thread-5 正在执行任务...
21:46:36.822 [main] INFO com.c3stones.test.CallableTest - thread-5 返回结果：thread-5
21:46:36.877 [lambda-thread-1] INFO com.c3stones.test.CallableTest - lambda-thread-1 正在执行任务...
21:46:37.878 [main] INFO com.c3stones.test.CallableTest - lambda-thread-1 返回结果：lambda-thread-1
21:46:37.878 [lambda-thread-2] INFO com.c3stones.test.CallableTest - lambda-thread-2 正在执行任务...
21:46:38.878 [main] INFO com.c3stones.test.CallableTest - lambda-thread-2 返回结果：lambda-thread-2
21:46:38.878 [lambda-thread-3] INFO com.c3stones.test.CallableTest - lambda-thread-3 正在执行任务...
21:46:39.878 [main] INFO com.c3stones.test.CallableTest - lambda-thread-3 返回结果：lambda-thread-3
21:46:39.878 [lambda-thread-4] INFO com.c3stones.test.CallableTest - lambda-thread-4 正在执行任务...
21:46:40.878 [main] INFO com.c3stones.test.CallableTest - lambda-thread-4 返回结果：lambda-thread-4
21:46:40.878 [lambda-thread-5] INFO com.c3stones.test.CallableTest - lambda-thread-5 正在执行任务...
21:46:41.879 [main] INFO com.c3stones.test.CallableTest - lambda-thread-5 返回结果：lambda-thread-5
