Java线程间同步

不同步的情况

public class Synchronize {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubQ q=new Q();new Thread(new Producer(q)).start();new Thread(new Consumer(q)).start();}}class Producer implements Runnable{Q q;public Producer(Q q) {this.q=q;}public void run(){int i=0;while(true){if(i==0){q.name="zhangsan"; try { Thread.sleep(1);} catch (Exception e) {e.printStackTrace();}q.sex="male";}else{q.name="lishi";q.sex="female";}i=(i+1)%2;}}}class Consumer implements Runnable{Q q;public Consumer(Q q){this.q=q;}public void run(){while(true){System.out.print(q.name);System.out.println(" "+q.sex);}}}class Q{String name="";String sex="";}

 

修改后同步的情况

 

 

public class Synchronize {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubQ q=new Q();new Thread(new Producer(q)).start();new Thread(new Consumer(q)).start();}}class Producer implements Runnable{Q q;public Producer(Q q) {this.q=q;}public void run(){int i=0;while(true){synchronized (q) {if(i==0){q.name="zhangsan"; try { Thread.sleep(1);} catch (Exception e) {e.printStackTrace();}q.sex="male";}else{q.name="lishi";q.sex="female";}i=(i+1)%2;}}}}class Consumer implements Runnable{Q q;public Consumer(Q q){this.q=q;}public void run(){while(true){synchronized (q) {System.out.print(q.name);System.out.println(" "+q.sex);}}}}class Q{String name="";String sex="";}