一：线程的基本概念
1. 调用run()方法
public class Demo1 {
publicstatic void main(String[] args) {
Thread1th1=new Thread1("线程A");
Thread1th2=new Thread1("线程B");
th1.run();
th2.run();
}
}
class Thread1 extends Thread{
privateString name;
publicThread1(String name){
this.name=name;
}
publicvoid run(){
for(inti=0;i<10;i++){
System.out.println(name+"运行i="+i);
}
}
}
2. 调用start()方法，报错
Thread1 th1=new Thread1("线程A");
th1.start();
th1.start();
3. 实现runnable接口
public class Demo1 {
publicstatic void main(String[] args) {
Thread1th1=new Thread1("线程A");
Threadt1=new Thread(th1);
t1.start();
}
}
class Thread1 implements Runnable{
privateString name;
publicThread1(String name){
this.name=name;
}
publicvoid run(){
for(inti=0;i<10;i++){
System.out.println(name+"运行i="+i);
}
}
}
总结：实现Runnable接口的优势
1. 多个相同的程序代码线程处理同一资源
2. 避免java单继承带来的局限
3. 增强程序的健壮性
二：线程的状态
1. 创建状态
Thread thread=newThread();
2. 就绪状态
thread.start();
3. 运行状态
thread.run();
4. 堵塞状态
sleep(),wait(),suspend()
5. 死亡状态
thread.stop();或者run()方法运行结束后
操作线程的相关方法
1. 线程名称
package com.cloud.day5;
public class day1 {
publicstatic void main(String[] args) {
MyThreadmt=new MyThread();
//系统自动设置线程名称
newThread(mt).start();
//自己设置线程名称
newThread(mt,"线程A").start();
}
}
class MyThread implements Runnable{
@Override
publicvoid run() {
for(inti=0;i<3;i++){
System.out.println(Thread.currentThread().getName()+"运行i="+i+"次");
}
}
}
2. 判断线程是否启动
package com.cloud.day5;
public class day1 {
publicstatic void main(String[] args) {
MyThreadmt=new MyThread();
Threadt=new Thread(mt,"线程");
System.out.println("线程启动前："+t.isAlive());
t.start();
System.out.println("线程启动后："+t.isAlive());
for(inti=0;i<3;i++){
System.out.println("main运行"+i);
}
System.out.println("代码执行完毕"+t.isAlive());
}
}
class MyThread implements Runnable{
@Override
publicvoid run() {
for(inti=0;i<3;i++){
System.out.println(Thread.currentThread().getName()+"运行i="+i+"次");
}
}
}
3. 线程强制运行
package com.cloud.day5;
public class day1 {
publicstatic void main(String[] args) {
MyThreadmt=new MyThread();
Threadt=new Thread(mt,"线程");
t.start();
for(inti=0;i<50;i++){
if(i>10){
try{
t.join();
}catch(Exceptione){}
}
System.out.println("main线程运行"+i);
}
}
}
class MyThread implements Runnable{
@Override
publicvoid run() {
for(inti=0;i<3;i++){
System.out.println(Thread.currentThread().getName()+"运行i="+i+"次");
}
}
}
4. 线程休眠
package com.cloud.day5;
public class day1 {
publicstatic void main(String[] args) {
MyThreadmt=new MyThread();
Threadt=new Thread(mt,"线程");
t.start();
}
}
class MyThread implements Runnable{
@Override
publicvoid run() {
for(inti=0;i<5;i++){
try{
Thread.sleep(500);
}catch (Exception e) {
}
System.out.println(Thread.currentThread().getName()+"运行i="+i+"次");
}
}
}
5. 线程的中断
package com.cloud.day5;
public class day1 {
publicstatic void main(String[] args) {
MyThreadmt=new MyThread();
Threadt=new Thread(mt,"线程");
t.start();
try{
Thread.sleep(2000);
}catch (Exception e) {
//TODO: handle exception
}
//中断线程执行
t.interrupt();
}
}
class MyThread implements Runnable{
@Override
publicvoid run() {
System.out.println("1.进入run方法");
try{
Thread.sleep(10000);
System.out.println("2.完成10秒休眠");
}catch (Exception e) {
System.out.println("3.终止休眠");
}
System.out.println("4.run方法正常结束");
}
}
6. 线程的优先级
package com.cloud.day5;
public class day1 {
publicstatic void main(String[] args) {
System.out.println("main线程的优先级："+Thread.currentThread().getPriority());
Threadt1=new Thread(new MyThread(),"线程A");
Threadt2=new Thread(new MyThread(),"线程B");
Threadt3=new Thread(new MyThread(),"线程C");
t1.setPriority(Thread.MIN_PRIORITY);
t2.setPriority(Thread.MAX_PRIORITY);
t3.setPriority(Thread.NORM_PRIORITY);
t1.start();
t2.start();
t3.start();
}
}
class MyThread implements Runnable{
@Override
publicvoid run() {
for(inti=0;i<5;i++){
try{
Thread.sleep(500);
}catch (Exception e) {
}
System.out.println(Thread.currentThread().getName()+"运行i="+i+"次");
}
}
}
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