[Java] PhoneManager

public class Manage {
Scanner sc = new Scanner(System.in);
HashMap<String, ArrayList<PhoneInfo>> map = new HashMap<String, ArrayList<PhoneInfo>>();
int choice;

Manage(){
}

void disp(){
System.out.println("-------전화번호부 관리 프로그램--------");
System.out.println("1.입력  2.출력  3.수정 4.삭제 5.정렬 6.저장 7.불러오기");
}

void choice()throws Exception{
while(true){
disp();
try{choice = sc.nextInt();
sc.nextLine();
}catch(Exception e){
System.out.println("숫자만 입력하시오!");
return;
}
switch(choice){
case 1:
Input();
break;
case 2:
show();
break;
case 3:
modify();
break;
case 4:
delete();
break;
case 5:
sort();
break;
case 6:
write();
break;
case 7:
read();
break;
default:
return;
}
}
}

void addGroup(String group){
if(!map.containsKey(group)){
map.put(group, new ArrayList<PhoneInfo>());
}
}

void Input(){
System.out.print("그룹 입력 : ");
String group = sc.nextLine();
System.out.print("이름 입력 : ");
String name = sc.nextLine();
System.out.print("전화 번호 입력 : ");
String phone = sc.nextLine();
System.out.print("생일 입력 : ");
String birth = sc.nextLine();

addGroup(group);
ArrayList<PhoneInfo> list = map.get(group);
   list.add(new PhoneInfo(name, phone, birth));
   System.out.println();
}

void show(){
Set set = map.entrySet();
Iterator iter = set.iterator();

while(iter.hasNext()){
Map.Entry e = (Map.Entry)iter.next();
System.out.println(e.getKey() + "[" + ((ArrayList)e.getValue()).size() + "]");
Iterator iterSub = ((ArrayList)e.getValue()).iterator();
while(iterSub.hasNext()){
PhoneInfo pi = (PhoneInfo)(iterSub.next());
pi.showInfo();
}
System.out.println();
}
System.out.println();
}

void modify(){
System.out.print("전화번호부 수정할 사람의 이름을 입력해 주십시오");
String name = sc.nextLine();

Set set = map.entrySet();
Iterator iter = set.iterator();

while(iter.hasNext()){
Map.Entry e = (Map.Entry)iter.next();
Iterator iterSub = ((ArrayList)e.getValue()).iterator();

while(iterSub.hasNext()){
PhoneInfo pi = (PhoneInfo)(iterSub.next());
if(pi.name.equals(name)){
System.out.print("수정할 전화번호를 입력하세요");
String phone = sc.nextLine();
pi.phoneNum = phone;
}
}
}
System.out.println();
}

void delete(){
System.out.print("삭제할 사람의 이름을 입력해 주십시오.");
String name = sc.nextLine();

Set set = map.entrySet();
Iterator iter = set.iterator();

while(iter.hasNext()){
Map.Entry e = (Map.Entry)iter.next();
Iterator iterSub = ((ArrayList)e.getValue()).iterator();

while(iterSub.hasNext()){
PhoneInfo pi = (PhoneInfo)(iterSub.next());
if(pi.name.equals(name)){
iterSub.remove();
}
}
}
}

void sort(){
Comparator<PhoneInfo> cp = new Comparator<PhoneInfo>() {

@Override
public int compare(PhoneInfo o1, PhoneInfo o2) {
// TODO Auto-generated method stub
if(o1.name.compareTo(o2.name)<0)
return -1;
else if(o1.name.compareTo(o2.name)>0)
return 1;
return 0;
}
};

Set set = map.entrySet();
Iterator iter = set.iterator();
System.out.print("정렬할 그룹를 입력하세요");
String group = sc.nextLine();

while(iter.hasNext()){
Map.Entry e = (Map.Entry)iter.next();

if(e.getKey().equals(group))
Collections.sort(((ArrayList)e.getValue()), cp);

}
System.out.println();
}

private void write() throws Exception {
// TODO Auto-generated method stub
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("PhonInfo.ser"));
oos.writeObject(map);
oos.close();
//map = null;
System.out.println("저장되었습니다.");
}

private void read() throws Exception {
// TODO Auto-generated method stub
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("PhonInfo.ser"));
map = (HashMap<String, ArrayList<PhoneInfo>>)ois.readObject();
ois.close();
System.out.println("불러오기를 완료했습니다.");
}

}