-------------------synchronized不生效---------------
public?class?tx?implements?Runnable{
static?Integer??a=new?Integer(0);
????static??int??i=0;
public?void?increase(){
????Integer?integer?=?new?Integer(0);
????synchronized(integer){
????i++;}
}
@Override
public?void?run(){
????for?(int?j?=0?;?j<10000;j++){
????????increase();
????}
}

public?static?void?main(String[]?args)?throws?InterruptedException?{
????tx?tx?=?new?tx();
????Thread?t1?=?new?Thread(tx);
????Thread?t2?=?new?Thread(tx);
????t1.start();
????t2.start();
????t1.join();
????t2.join();
????System.out.println(i);
}
----------------分割線（synchronized生效）---------------------
public?class?tx?implements?Runnable{
static?Integer??a=new?Integer(0);
????static??int??i=0;
?????Integer?integer?=?new?Integer(0);---》放入increase方法內(nèi)定義不生效
public?void?increase(){?
????synchronized(integer){
????i++;}
}
@Override
public?void?run(){
????for?(int?j?=0?;?j<10000;j++){
????????increase();
????}
}

public?static?void?main(String[]?args)?throws?InterruptedException?{
????tx?tx?=?new?tx();
????Thread?t1?=?new?Thread(tx);
????Thread?t2?=?new?Thread(tx);
????t1.start();
????t2.start();
????t1.join();
????t2.join();
????System.out.println(i);
}