直接贴代码了
package test;
public class TestThreadLocal {
public static void main(String[] args) {
/*ExecutorService exce = Executors.newCachedThreadPool();
for(int i=0;i<10;i++){
exce.execute(new Thread(new TestThread(),"this is thread:"+i));
}
exce.shutdown();
}
*/
//一个公共的对象
TestI testI = new TestI();
//创建一个ThreadLocal来维护这个对象
LocalObject localObject = new LocalObject();
localObject.addTestI(testI);
// System.out.println(localObject.getTestI().getI());
for(int i=0;i<10 ;i++){
new Thread(new TestThread(localObject),"this is thread:"+i).start();
}
}
}
class LocalObject{
//创建一个ThreadLocal 用来维护对象TestI
private ThreadLocal<TestI> testIocal = new ThreadLocal<TestI>();
public void addTestI(TestI testI){
testIocal.set(testI);
}
public TestI getTestI(){
return testIocal.get();
}
public void doSomeThing(){
getTestI().setI();
}
}
class TestThread implements Runnable{
private LocalObject localObject ;
public TestThread(LocalObject localObject){
this.localObject = localObject;
}
private int i=10;
@Override
public void run() {
while(this.localObject.getTestI().getI()>0){
this.localObject.doSomeThing();
i--;
if(this.localObject.getTestI().getI()!=i){
System.out.println(Thread.currentThread().getName()+"not matched");
}
// System.out.println(Thread.currentThread().getName()+"::"+LocalObject.getTestI().getI());
}
}
}
class TestI {
private int i=10;
public void setI(){
i--;
}
public int getI(){
return i;
}
}
报错是Exception in thread "this is thread:1" java.lang.NullPointerException
at test.TestThread.run(TestThreadLocal.java:75)
就是run方法里面找不到对象，但是我通过构造方法注入了一个对象了呀。怎么回事 搞了2天了。。。
