?synchronized：隐式锁，出了作用域自动释放，有代码块锁和方法锁
LOCK：显示锁（手动开启和释放）只有代码块锁；花费较少的时间调度线程，性能更好
public class DeadLock extends Thread{
public static void main(String[] args) {
Makeup g1 = new Makeup(0,"A");
Makeup g2 = new Makeup(1,"B");
g1.start();
g2.start();
}
}
class Lipstick{
}
class Mirror{
}
class Makeup extends Thread{
static Lipstick lip = new Lipstick();
static Mirror mirror = new Mirror();
int choice;
String name;
Makeup(int choices,String name){
this.choice = choices;
this.name = name;
}
public void run(){
try {
makeup();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
private void makeup() throws InterruptedException {
if(choice == 0){
synchronized (lip){
System.out.println(this.name+"拿到口红");
Thread.sleep(1000);
synchronized (mirror){
System.out.println(this.name+"拿到镜子");
}
}
}else{
synchronized (mirror){
System.out.println(this.name+"拿到镜子");
Thread.sleep(1000);
synchronized (lip){
System.out.println(this.name+"拿到口红");
}
}
}
}
}
public class DeadLock extends Thread{
public static void main(String[] args) {
Makeup g1 = new Makeup(0,"A");
Makeup g2 = new Makeup(1,"B");
g1.start();
g2.start();
}
}
class Lipstick{
}
class Mirror{
}
class Makeup extends Thread{
static Lipstick lip = new Lipstick();
static Mirror mirror = new Mirror();
int choice;
String name;
Makeup(int choices,String name){
this.choice = choices;
this.name = name;
}
public void run(){
try {
makeup();
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
private void makeup() throws InterruptedException {
if(choice == 0){
synchronized (lip){
System.out.println(this.name+"拿到口红");
Thread.sleep(1000);
}
synchronized (mirror){
System.out.println(this.name+"拿到镜子");
}
}else{
synchronized (mirror){
System.out.println(this.name+"拿到镜子");
Thread.sleep(1000);
}
synchronized (lip){
System.out.println(this.name+"拿到口红");
}
}
}
}
import java.util.concurrent.locks.ReentrantLock;
public class TestLock {
public static void main(String[] args) {
testlock2 t1 = new testlock2();
testlock2 t2 = new testlock2();
testlock2 t3 = new testlock2();
new Thread(t1).start();
//new Thread(t2).start();
//new Thread(t3).start();
}
}
class testlock2 implements Runnable{
int num = 10;
private final ReentrantLock lock = new ReentrantLock();
@Override
public void run() {
while(true){
lock.lock();
try{
if(num >0){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
System.out.println(num--);
}
else{
break;
}
}finally {
lock.unlock();
}
}
}
}