import java.io.*;
class Counter{
private int counterValue;
Counter(int n){
counterValue=n;}
public int initiate(){
return counterValue;}
public int increment(int m){
return counterValue+=m;}
public int decrement(int m){
return counterValue-=m;}
public int reset(){
return counterValue=0;}
}
public class UseCounter{
public static void main(String args[]){
int g=0;
String s=" ";
Counter myCounter = new Counter(5);
System.out.println("当前投影仪数目为:"+myCounter.initiate());
for(int j=0; ;j++){
System.out.print("请选择操作：1.购入 2.收回 3.淘汰 4 退出：");
try{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
s = br.readLine();
}catch(IOException e){};
if(s.equals("1")){
try{
System.out.print("请输入购入个数:");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String h = br.readLine();
g = Integer.parseInt(h);
}catch(IOException e){};
System.out.println("现在投影仪个数为："+myCounter.increment(g));}
if(s.equals("2")){
try{
System.out.print("请输入收回个数:");
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