【Java多线程】线程的常用方法
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测试Thread中的常用方法
1.start():启动当前线程调用当前线程的run()
2.run():通常需要重写Thread类中的此方法将创建的线程要执行的
3.currentThread():静态方法返回当前代码的线程
4.getName():获取当前线程的名字
5.setName():设置当前线程的名字
6.yield():释放当前cpu的执行权
7.join():在线程a中调用线程b的join()此时线程就进入阻塞状态直到线程b完全执行完以后线程a才结束阻塞状态
8.stop():已过时。当执行此方法时强制结束当前线程。
9.sleep(long millis):使当前正在执行的线程以指定的毫秒数暂停暂时停止执行具体取决于系统定时器和调度程序的精度和准确性
10.isAlive():判断当前线程是否存活
=============================详细讲解如下================================
给线程命名的方法
1.通过setName()给线程命名
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread();
h1.setName("线程1");
h1.start();
}
}
运行结果如下
2.给主线程命名
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread();
h1.setName("线程1");
h1.start();
//给主线程命名
Thread.currentThread().setName("主线程");
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
}
运行结果如下
3.通过构造器
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
public HelloThread(String name){
super(name);
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread("Thread:1");
//h1.setName("线程1");
h1.start();
//给主线程命名
Thread.currentThread().setName("主线程");
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
}
运行结果如下
yield():释放当前cpu的执行权、
package java1;
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i % 20 == 0){
yield();
}
}
}
public HelloThread(String name){
super(name);
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread("Thread:1");
//h1.setName("线程1");
h1.start();
//给主线程命名
Thread.currentThread().setName("主线程");
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
}
}
}
join()方法在线程a中调用线程b的join()此时线程就进入阻塞状态直到线程b完全执行完以后线程a才结束阻塞状态
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i % 20 == 0){
yield();
}
}
}
public HelloThread(String name){
super(name);
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread("Thread:1");
//h1.setName("线程1");
h1.start();
//给主线程命名
Thread.currentThread().setName("主线程");
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i == 20) {
try {
h1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
stop():已过时。当执行此方法时强制结束当前线程。
sleep(long millis):使当前正在执行的线程以指定的毫秒数暂停暂时停止执行具体取决于系统定时器和调度程序的精度和准确性
当主线程执行到20等分线程一秒一下执行完在执行主线程
代码如下
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
try {
sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i % 20 == 0){
yield();
}
}
}
public HelloThread(String name){
super(name);
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread("Thread:1");
//h1.setName("线程1");
h1.start();
//给主线程命名
Thread.currentThread().setName("主线程");
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i == 20) {
try {
h1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
isAlive():判断当前线程是否存活
class HelloThread extends Thread{
@Override
public void run() {
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
// try {
// sleep(1000);
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i % 20 == 0){
yield();
}
}
}
public HelloThread(String name){
super(name);
}
}
public class ThreadMethodTest {
public static void main(String[] args) {
HelloThread h1 = new HelloThread("Thread:1");
//h1.setName("线程1");
h1.start();
//给主线程命名
Thread.currentThread().setName("主线程");
for (int i = 0; i < 100; i++) {
if (i % 2 == 0){
System.out.println(Thread.currentThread().getName() + ":" + i);
}
if (i == 20) {
try {
h1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
System.out.println(h1.isAlive());
}
}
感谢观看