java线程
public class SyPrint {
public synchronized void printName(String name){
for(int i=0;i<name.length();i++){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.print(name.charAt(i));
}
}
}
public class SyThreadRunable implements Runnable{
SyPrint s = new SyPrint();
private String name ;
public void setName(String name) {
this.name = name;
}
@Override
public void run() {
// TODO Auto-generated method stub
s.printName(Thread.currentThread().getName());
}
}
public class SyThread {
public static void main(String[] args) {
SyThreadRunable target = new SyThreadRunable();
SyThreadRunable target2 = new SyThreadRunable();
Thread t1 = new Thread(target);
Thread t2 = new Thread(target2);
t1.setName("zhangsan");
t2.setName("lisi");
t1.start();
t2.start();
}
}
public class SyThread {
public static void main(String[] args) {
SyThreadRunable target = new SyThreadRunable();
Thread t1 = new Thread(target);
Thread t2 = new Thread(target);
t1.setName("zhangsan");
t2.setName("lisi");
t1.start();
t2.start();
}
}
上面两个类main 方法运行的结果第一个没有实现同步,第二个实现了。请问第一个为什么实现不了。