1.写出下面代码的执行结果:
public class T {
    

    public static void main(String[] args) {
        Byte b=new Byte("127");
        System.out.println(b.toString()==b.toString());
              
    }
}

2.写出下面代码的执行结果：
package com.ibm.bmcc.test;

public class T {
    

    public static void main(String[] args) {
        method1();
        System.out.println("f");
    }
    
    static void method1(){
        try{
            method2();
            System.out.println("a");
        }catch (NullPointerException e) {
            System.out.println("b");
        }finally{
            System.out.println("c");
        }
        System.out.println("d");
    }
    
    static void method2(){
        System.out.println("e");
        throw new IllegalStateException();
    }
    
    
    
}
3.用Java实现一个单利模式
4.多线程编程，第一个线程负责对某个数加一，第二个线程负责对这个数减一

public class BankQueueThread {
    
    private static List<CustomerInfo> queue= Collections.synchronizedList(new ArrayList<CustomerInfo>());
    private static List<String> vipqueue= Collections.synchronizedList(new ArrayList<String>());
    private static int num=0;
    private static int rnum=0;
    private SimpleDateFormat datef=new SimpleDateFormat("HH:mm");
    public static void main(String args[]) {
        BankQueueThread bankQueueThread=new BankQueueThread();
        AddUser adduser=bankQueueThread.new AddUser();
        Thread th= new Thread(adduser);
        th.start();
        
        for(int i=0;i<3;i++){
            OrderNormalQueue orn=bankQueueThread.new OrderNormalQueue();
            th= new Thread(orn);
            th.start();
        }
        OrderVIPQueue orv=bankQueueThread.new OrderVIPQueue();
        th= new Thread(orv);
        th.start();
    }
    //增加普通用户排队
    public synchronized void addUser(int nums){
        String s=""+(++num);
        CustomerInfo customerInfo=new CustomerInfo();
        customerInfo.setType("普通");
        customerInfo.setId(s);
        customerInfo.setFtime(nums);
        customerInfo.setStime(datef.format(new Date()));
        queue.add(customerInfo);
    }
    //增加VIP排队
    public synchronized void addVipUser(int nums){
        String s=""+(++num);
        CustomerInfo customerInfo=new CustomerInfo();
        customerInfo.setType("VIP");
        customerInfo.setId(s);
        customerInfo.setFtime(nums);
        customerInfo.setStime(datef.format(new Date()));
        queue.add(customerInfo);
        vipqueue.add(s);
    }
    //普通窗口假设处理业务
    public synchronized void removieUser(){
        CustomerInfo cus=null;
        if(queue.size()>0){
            rnum++;
            cus=(CustomerInfo)queue.remove(0);
        
            if(vipqueue.size()>0&&vipqueue.get(0).equals(cus.getId())){
               vipqueue.remove(0);
               System.out.println(Thread.currentThread().getName()+":>> "+rnum+" "+cus.getId()+" "+cus.getType()+" "+cus.getStime()+" "+cus.getFtime()+" <<办理业务完毕");
           }else{
               System.out.println(Thread.currentThread().getName()+":>> "+rnum+" "+cus.getId()+" "+cus.getType()+" "+cus.getStime()+" "+cus.getFtime()+" <<办理业务完毕");
           }
        }
    }
    //VIP窗口假设处理业务
    public synchronized void removieVipUser(){
        String d="";
        CustomerInfo cus=null;
        if(vipqueue.size()>0){
          rnum++;
          d=vipqueue.remove(0);
          for(int i=0;i<queue.size();i++){
              cus=(CustomerInfo)queue.get(i);
            if(cus.getId().equals(d)){
              queue.remove(i);
              System.out.println(Thread.currentThread().getName()+":>> "+rnum+" "+cus.getId()+" "+cus.getType()+" "+cus.getStime()+" "+cus.getFtime()+" <<办理业务完毕");
              break;
            }
          }
        }else if(queue.size()>0){
              rnum++;
              cus=(CustomerInfo)queue.remove(0);
              System.out.println(Thread.currentThread().getName()+":>> "+rnum+" "+cus.getId()+" "+cus.getType()+" "+cus.getStime()+" "+cus.getFtime()+" <<办理业务完毕");
        }
        
    }

    //用户排队
    class AddUser implements Runnable{
        Random rd=new Random();
        int sd=0;
        public void run() {
            // TODO Auto-generated method stub
            while(true){
            sd=rd.nextInt(10);
            if(sd==8){
                addVipUser(sd);
            }else{
                addUser(sd);
            }
            if(queue.size()>=100){
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            }
            
        }
        
    }
    //普通窗口业务受理
    class OrderNormalQueue implements Runnable{
        public void run() {
            // TODO Auto-generated method stub
            while(true){
            
              removieUser();
              try {
                Thread.currentThread().sleep(1000);
              } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              }
            }
        }
        
    }
    //VIP窗口业务受理
    class OrderVIPQueue implements Runnable{

        public void run() {
            // TODO Auto-generated method stub
            while(true){
            removieVipUser();
            try {
                Thread.currentThread().sleep(1000);
              } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              }
            }
        }
        
    }
    
    class CustomerInfo{
        
        private String stime;
        private String id;
        private String type;
        private int ftime;
        public String getStime() {
            return stime;
        }
        public void setStime(String stime) {
            this.stime = stime;
        }
        public String getId() {
            return id;
        }
        public void setId(String id) {
            this.id = id;
        }
        public String getType() {
            return type;
        }
        public void setType(String type) {
            this.type = type;
        }
        public int getFtime() {
            return ftime;
        }
        public void setFtime(int ftime) {
            this.ftime = ftime;
        }
    }
    

}