java 多线程的一些货色

java 多线程的一些东西

1.两种方式实现多线程

????????????? ?一种是继承Thread类，一种是实现Runnable接口；

?????????????? Thread类是在java.lang包中定义的。一个类只要继承了Thread类同时覆写了本类中的run()方法就可以实现多线程操作了，但是一个类只能继承一个父类，这是此方法的局限

????????????????

public class XunleiInterviewMultithread {public static void main(String[] args) {XunleiLock lock = new XunleiLock();new Thread(new XunleiPrinter("A", lock)).start();new Thread(new XunleiPrinter("B", lock)).start();new Thread(new XunleiPrinter("C", lock)).start();}}class XunleiPrinter implements Runnable {private String name = "";private XunleiLock lock = null;private int count = 10;public XunleiPrinter(String name, XunleiLock lock) {this.name = name;this.lock = lock;}@Overridepublic void run() {while (count > 0) {synchronized (lock) {if (lock.getName().equalsIgnoreCase(this.name)) {System.out.print(name);count--;if (this.name.equals("A")) {lock.setName("B");} else if (this.name.equals("B")) {lock.setName("C");} else if (this.name.equals("C")) {lock.setName("A");}}}}}}class XunleiLock {public String name = "A";public String getName() {return name;}public void setName(String name) {this.name = name;}}

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方法（二）线程类修改如下，其他类一样：

class XunleiPrinter2 implements Runnable {

?????? private String name = "";

?????? private XunleiLock lock = null;

?????? private int count=10;

?????? public XunleiPrinter2(String name, XunleiLock lock) {

????????????? this.name = name;

????????????? this.lock = lock;

?????? }

?????? @Override

?????? public void run() {

????????????? while(count>0) {

???????????????????? synchronized (lock) {

??????????????????????????? while(!lock.getName().equalsIgnoreCase(this.name)) {

?????????????????????????????????? try{

????????????????????????????????????????? lock.wait();

?????????????????????????????????? }catch(InterruptedException e){

????????????????????????????????????????? e.printStackTrace();

?????????????????????????????????? }

??????????????????????????? }

??????????????????????????? System.out.print(name);

??????????????????????????? count--;

??????????????????????????? if (this.name.equals("A")) {

?????????????????????????????????? lock.setName("B");

??????????????????????????? } elseif (this.name.equals("B")) {

?????????????????????????????????? lock.setName("C");

??????????????????????????? } elseif (this.name.equals("C")) {

?????????????????????????????????? lock.setName("A");

??????????????????????????? }

??????????????????????????? lock.notifyAll();

???????????????????? }

????????????? }

?????? }

}

来源：http://www.blogjava.net/hankchen