程序功能：4個線程，2個線程對某個數值進行加1；2個線程進行減1，要求該數在0和1之間切換。程序如下，大家看看問題出在哪里：

DecThread類，對sample的i進行減1的線程：

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 類，對sample的i進行加1的線程：

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類：

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();

}

}

}

測試類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();

}

}

總結

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