程序功能：4个线程，2个线程对某个数值进行加1；2个线程进行减1，要求该数在0和1之间切换。程序如下，大家看看问题出在哪里：
DecThread类，对sample的i进行减1的线程：
class="java">
public class DecThread extends Thread{
private Sample sample;
public DecThread(Sample sample, String name){
super(name);
this.sample = sample;
}
@Override
public void run() {
for(int i=0; i<20; i++){
sample.dec();
}
}
}
IncThread 类，对sample的i进行加1的线程：
public class IncThread extends Thread{
private Sample sample;
public IncThread(Sample sample, String name){
super(name);
this.sample = sample;
}
@Override
public void run() {
for(int i=0; i<20; i++){
sample.inc();
}
}
}
Sample类：
public class Sample {
int i = 0;
public synchronized void inc() {
try {
while (i == 1) {
wait();
}
i++;
System.out.println(Thread.currentThread().getName() + "-" + i);
notify();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public synchronized void dec() {
try {
while (i == 0) {
wait();
}
i--;
System.out.println(Thread.currentThread().getName() + "-" + i);
notify();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
测试类TestIncDec ：
public class TestIncDec {
public static void main(String[] args) {
Sample sample = new Sample();
IncThread inc1 = new IncThread(sample,"inc1");
IncThread inc2 = new IncThread(sample,"inc2");
DecThread dec1 = new DecThread(sample,"dec1");
DecThread dec2 = new DecThread(sample,"dec2");
inc1.start();
inc2.start();
dec1.start();
dec2.start();
}
}
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