Java Collection--ArrayList small staff project

ImportJava.io.*;Importjava.util.ArrayList; Public classEmexe { Public Static voidMain (string[] args)throwsIOException {empmanage em=NewEmpmanage (); BufferedReader BR=NewBufferedReader (NewInputStreamReader (system.in));  while(true) {System.out.println ("********** Management menu ************"); System.out.println ("1, add employee"); System.out.println ("2, find Employees"); System.out.println ("3. Modification of employees"); System.out.println ("4, delete employees"); System.out.println ("******************************"); System.out.println ("Please enter the number 1-4 select:"); String Opertype=Br.readline (); if(Opertype.equals ("1") {System.out.println ("Please enter employee number"); String EmpNo=Br.readline (); System.out.println ("Please enter employee name"); String name=Br.readline (); System.out.println ("Please enter employee Salary"); floatSal=float.parsefloat (Br.readline ()); EMP EMP=NewEmp (empno,name,sal);            Em.addemp (EMP); }            Else if(Opertype.equals ("2") {System.out.println ("Please enter employee number"); String EmpNo=Br.readline ();            Em.showinfo (EmpNo); }            Else if(Opertype.equals ("3")){                            }            Else if(Opertype.equals ("4")){                }        }            }}classemp{PrivateString EmpNo; PrivateString name; Private floatSal;  PublicEMP (String empno,string name,floatSal) {         This. empno=EmpNo;  This. name=name;  This. sal=Sal; }     PublicString Getempno () {returnEmpNo; }     Public voidsetempno (String empNo) { This. EmpNo =EmpNo; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     Public floatgetsal () {returnSal; }     Public voidSetsal (floatSal) {         This. Sal =Sal; }        }classempmanage{PrivateArrayList a1=NULL;  PublicEmpmanage () {A1=NewArrayList (); }     Public voidaddemp (emp emp) {a1.add (EMP); }     Public voidshowinfo (String empNo) {//traverse the entire ArrayList         for(intI=0;i<a1.size (); i++)        {            //Remove EMPEMP emp=(EMP) a1.get (i); if(Emp.getempno (). Equals (EmpNo)) {System.out.println ("The employee Number" +empno+ "name" +emp.getname () + "salary" +emp.getsal ()); }        }    }     Public voidUpdate (String EmpNo,floatnewsal) {         for(intI=0;i<a1.size (); i++) {EMP emp=(EMP) a1.get (i); if(Emp.getempno (). Equals (EmpNo)) {emp.setsal (newsal); System.out.println ("Success!"); }        }    }     Public voiddelemp (String empNo) { for(intI=0;i<a1.size (); i++) {EMP emp=(EMP) a1.get (i); if(Emp.getempno (). Equals (EmpNo)) {a1.remove (i); System.out.println ("Success!"); }        }    }}

Java Collection--ArrayList small staff project