方法名 | 说明 |
---|---|
void run() | 在线程开启后,此方法将被调用执行 |
void start() | 使此线程开始执行,Java虚拟机会调用run方法() |
因为run()
是用来封装被线程执行的代码
run()
:封装线程执行的代码,直接调用,相当于普通方法的调用start()
:启动线程;然后由JVM调用此线程的run()方法class MyThread extends Thread {
@Override
public void run() {
for(int i=0; i<100; i++) {
System.out.println(i);
}
}
}
public class Demo {
public static void main(String[] args) {
MyThread my1 = new MyThread();
MyThread my2 = new MyThread();
// my1.run();
// my2.run();
//void start() 导致此线程开始执行; Java虚拟机调用此线程的run方法
my1.start();
my2.start();
}
}
方法名 | 说明 |
---|---|
void setName(String name) | 将此线程的名称更改为等于参数name |
String getName() | 返回此线程的名称 |
Thread currentThread() | 返回对当前正在执行的线程对象的引用 |
class MyThread extends Thread {
public MyThread() {}
public MyThread(String name) {
super(name);
}
@Override
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println(getName()+":"+i);
}
}
}
// 测试类
public class Demo {
public static void main(String[] args) {
MyThread my1 = new MyThread();
MyThread my2 = new MyThread();
//void setName(String name):将此线程的名称更改为等于参数 name
my1.setName("线程1");
my2.setName("线程2");
//Thread(String name)
// MyThread my1 = new MyThread("线程1");
// MyThread my2 = new MyThread("线程2");
my1.start();
my2.start();
//static Thread currentThread() 返回对当前正在执行的线程对象的引用
System.out.println(Thread.currentThread().getName());
}
}
方法名 | 说明 |
---|---|
final int getPriority() | 返回此线程的优先级 |
final void setPriority(intnewPriority) | 更改此线程的优先级 线程默认优先级是5;线程优先级的范围是:1-10 |
class ThreadPriority extends Thread {
@Override
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println(getName() + ":" + i);
}
}
}
// 测试类
public class Demo {
public static void main(String[] args) {
ThreadPriority tp1 = new ThreadPriority();
ThreadPriority tp2 = new ThreadPriority();
ThreadPriority tp3 = new ThreadPriority();
tp1.setName("线程1");
tp2.setName("线程2");
tp3.setName("线程3");
//public final int getPriority():返回此线程的优先级
System.out.println(tp1.getPriority()); //5
System.out.println(tp2.getPriority()); //5
System.out.println(tp3.getPriority()); //5
//public final void setPriority(int newPriority):更改此线程的优先级
// tp1.setPriority(10000); //IllegalArgumentException
System.out.println(Thread.MAX_PRIORITY); //10
System.out.println(Thread.MIN_PRIORITY); //1
System.out.println(Thread.NORM_PRIORITY); //5
//设置正确的优先级
tp1.setPriority(5);
tp2.setPriority(10);
tp3.setPriority(1);
tp1.start();
tp2.start();
tp3.start();
}
}
方法名 | 说明 |
---|---|
static void sleep(long millis) | 使当前正在执行的线程停留(暂停执行)指定的毫秒数 |
void join() | 等待这个线程死亡 |
void setDaemon(boolean on) | 将此线程标记为守护线程,当运行的线程都是守护线程时,Java虚拟机将退出 |
class ThreadSleep extends Thread {
@Override
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println(getName() + ":" + i);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
// 测试类
public class Demo {
public static void main(String[] args) {
ThreadSleep ts1 = new ThreadSleep();
ThreadSleep ts2 = new ThreadSleep();
ThreadSleep ts3 = new ThreadSleep();
ts1.setName("线程1");
ts2.setName("线程2");
ts3.setName("线程3");
ts1.start();
ts2.start();
ts3.start();
}
}
class ThreadJoin extends Thread {
@Override
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println(getName() + ":" + i);
}
}
}
// 测试类
public class Demo {
public static void main(String[] args) {
ThreadJoin tj1 = new ThreadJoin();
ThreadJoin tj2 = new ThreadJoin();
ThreadJoin tj3 = new ThreadJoin();
tj1.setName("线程1");
tj2.setName("线程2");
tj3.setName("线程3");
tj1.start();
try {
tj1.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
tj2.start();
tj3.start();
}
}
class ThreadDaemon extends Thread {
@Override
public void run() {
for (int i = 0; i < 100; i++) {
System.out.println(getName() + ":" + i);
}
}
}
//测试类
public class Demo {
public static void main(String[] args) {
ThreadDaemon td1 = new ThreadDaemon();
ThreadDaemon td2 = new ThreadDaemon();
td1.setName("线程1");
td2.setName("线程2");
//设置主线程为线程1
Thread.currentThread().setName("线程1");
//设置守护线程
td1.setDaemon(true);
td2.setDaemon(true);
td1.start();
td2.start();
for(int i=0; i<10; i++) {
System.out.println(Thread.currentThread().getName()+":"+i);
}
}
}
线程一共有五种状态,线程在各种状态之间转换。
方法名 | 说明 |
---|---|
Thread(Runnable target) | 分配一个新的Thread对象 |
Thread(Runnable target, String name) | 分配一个新的Thread对象 |
class MyRunnable implements Runnable {
@Override
public void run() {
for(int i=0; i<100; i++) {
System.out.println(Thread.currentThread().getName()+":"+i);
}
}
}
//测试类
public class Demo {
public static void main(String[] args) {
//创建MyRunnable类的对象
MyRunnable my = new MyRunnable();
//创建Thread类的对象,把MyRunnable对象作为构造方法的参数
//Thread(Runnable target)
// Thread t1 = new Thread(my);
// Thread t2 = new Thread(my);
//Thread(Runnable target, String name)
Thread t1 = new Thread(my,"线程1");
Thread t2 = new Thread(my,"线程2");
//启动线程
t1.start();
t2.start();
}
}