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本程序使用多线程并发模拟多个发卡人同时发卡，利用简单的同步锁（关键字synchronized）实现线程同步控制。请在阅读程序的基础上完成填空（共5个空）。public class TestIssueClimbingCard {public static void main(String[] args) {IssueClimbingCard icc = (1);Thread staffA = new Thread(icc, "发卡人A");Thread staffB = new Thread(icc, "发卡人B");Thread staffC = new Thread(icc, "发卡人C");staffA.start();staffB.start();staffC.start();}}class IssueClimbingCard implements (2) {private int ClimbingCardNum = 1;@Overridepublic void (3) {while(true){(4) (this){ //同步块if(ClimbingCardNum <= 100) {try {// 此处睡眠10毫秒(5);} catch (InterruptedExceptione) {e.printStackTrace();}System.out.println(Thread.currentThread().getName() + "：发放第"+ ClimbingCardNum+ "号登山卡；");ClimbingCardNum ++;} else {System.out.println(Thread.currentThread().getName() + "：100张卡已全部发放完毕！");break;}}}}}

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