如果每个线程执行的代码相同，可以使用同一个Runnable对象，这个Runnable对象中有那个共享的数据，例如 买票系统就是那么做的。
[java]
package com.itm.thread;
public class MultiThreadShareData {
public static void main(String[] args) {
ShareData1 data1 = new ShareData1();
//(1)种方法。
new Thread(data1).start();
new Thread(data1).start();
}
}
class ShareData1 implements Runnable{
private int count = 100;
@Override
public void run() {
while(true){
count--;
}
}
private int j = 0;
public synchronized void increment(){
j++;
}
public synchronized void descrement(){
j--;
}
}
package com.itm.thread;
public class MultiThreadShareData {
public static void main(String[] args) {
ShareData1 data1 = new ShareData1();
//(1)种方法。
new Thread(data1).start();
new Thread(data1).start();
}
}
class ShareData1 implements Runnable{
private int count = 100;
@Override
public void run() {
while(true){
count--;
}
}
private int j = 0;
public synchronized void increment(){
j++;
}
public synchronized void descrement(){
j--;
}
}
如果 每个线程执行的代码不同 怎么解决呢？？？
[java]
package com.itm.thread;
public class MultiThreadShareData2 {
private final static TwoShareData data1 = new TwoShareData();
public static void main(String[] args) {
// 此为 共享数据。
TwoShareData data2 = new TwoShareData();
new Thread(new OneMyRunnable(data2)).start();
new Thread(new TwoMyRunnable(data2)).start();
// 局部变量 加上 final。也可以行得通。
final TwoShareData data1 = new TwoShareData();
// Runnable 为 内部类。
new Thread(new Runnable(){
@Override
public void run() {
data1.descrement();
}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
data1.increment();
}
}).start();
}
}
class OneMyRunnable implements Runnable{
private TwoShareData data1;
public OneMyRunnable(TwoShareData data1){
this.data1 = data1;
}
public void run(){
data1.descrement();
}
}
class TwoMyRunnable implements Runnable{
private TwoShareData data1;
public TwoMyRunnable(TwoShareData data1){
this.data1 = data1;
}
public void run(){
data1.increment();
}
}
class TwoShareData {
private int j = 0;
public synchronized void increment(){
j++;
}
public synchronized void descrement(){
j--;
}
}
package com.itm.thread;
public class MultiThreadShareData2 {
private final static TwoShareData data1 = new TwoShareData();
public static void main(String[] args) {
// 此为 共享数据。
TwoShareData data2 = new TwoShareData();
new Thread(new OneMyRunnable(data2)).start();
new Thread(new TwoMyRunnable(data2)).start();