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”信息和一个“End”信息并且间隔地显示2个“Loop”信息(间隔变化为(0.5-2)秒之间的随机延迟)。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 Startb Startc Startb Loopa Loopb Loopb Endc Loopa Loopa Endc Loopc 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(_________________);}}
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”信息和一个“End”信息并且间隔地显示2个“Loop”信息(间隔变化为(0.5-2)秒之间的随机延迟)。
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(_________________);
}
}