请完成下列Java程序:运行3个线程,每一个线程有自己的标志,用a,b,c表示,每个线程显示一个“Start”
程序运行结果如下:(注:由于时间间隔为随机数,所以,运行结果的顺序不惟一)
a Start
b Start
c Start
b Loop
a Loop
b Loop
b End
c Loop
a Loop
a End
c Loop
c End
注意:请勿改动main()主方法和其他已有语句内容,仅在下划线处填入适当的语句。
public class ex2_2 implements Runnable {
static char flag2_2 = 'a';
public static void main(String[] arg) {
ex2_2 obj2_2 = new ex2_2();
Thread thread2_2 = new Thread(obi2_2);
thread2_2.start();
thread2_2 = new Thread(obj2_2);
thread2 2.start();
thread2_2 = new Thread(obi2_2);
thread2_2, start ();
}
public void run() {
char myflag2_2;
synchronized(this) {
_________________;
}
System.out.println(myflag2_2 +" Start");
for(int i=0; i<2; i++) {
try {
Thread.sleep(rand(500,2000));
System.out.println(myflag2_2 +" Loop");
} catch(InterruptedException ie) {
System.out.println(ie);
}
}
System.out.println(myflag2_2 +" End");
}
final private int rand(int low, int high)
return(_________________);
}
}