My Life Goes By My Style

import java.io.*;
public class test13
{
public static void main(String[] args)throws IOException
{

BufferedReader input = new BufferedReader
(new InputStreamReader(System.in));

char ch,c;
do
{
System.out.println("*** 模擬選單功能 ***");
System.out.println();
System.out.println("\tA. 儲存功能");
System.out.println("\tB. 修改功能");
System.out.println("\tC. 刪除功能");
System.out.println("\tD. 離開功能");
System.out.println();
System.out.println("*********************");

while(true)
{
System.out.print("請選擇功能: ");
c=(char)input.read();
input.skip(2);
c=Character.toUpperCase(c);
if((c=='A')||(c=='B')||(c=='C')||(c=='D'))
break;
}
if(c=='A')
{
System.out.print("已儲存完畢,請按任意鍵回到主畫面");
ch=(char)input.read();
input.skip(2);
}
else if (c=='B')
{
System.out.print("已經修改完成,請按任意鍵回到主畫面");
ch=(char)input.read();
input.skip(2);
}
else if(c=='C')
{
System.out.print("已經刪除檔案,請按任意鍵回到主畫面");
ch=(char)input.read();
input.skip(2);
}
else if(c=='D')
System.out.println("即將離開程式");


}while((c!='D'));
}
}