import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
public class Test {
private final static Executor executor = Executors.newCachedThreadPool();//启用多线程
public static void main(String[] args) {
for(int i=0;i<=3;i++){
final int j=i; //关键是这一句代码，将 i 转化为 j，这样j 还是final类型的参与线程
executor.execute(new Runnable() {
@Override
public void run() {
try{
System.out.println(j);
}catch(Exception e){
}
}
});
}
}
}
)
