入力文字から文字を抽出

//Sample_21_13.java
import java.io.Console;
public class Sample_21_13 {

  private static Console cons = System.console();

  public static Character getChar(String msg){

      Character och = null;

      String str = cons.readLine(msg);
      if(str.length() != 0){
          och = str.charAt(0);
      }

      return och;
  }

  public static void main(String[] args) {

      Character oc = getChar("Input [a-z]: ");
      switch(oc){
        case 'a': System.out.println("Alfa"); break;
        case 'b': System.out.println("Bravo"); break;
        case 'c': System.out.println("Charlie"); break;
        case 'd': System.out.println("Delta"); break;
        case 'e': System.out.println("Echo"); break;
        case 'f': System.out.println("Foxtrot"); break;
        case 'g': System.out.println("Golf"); break;
        case 'h': System.out.println("Hotel"); break;
        case 'i': System.out.println("India"); break;
        case 'j': System.out.println("Juliett"); break;
        case 'k': System.out.println("Kilo"); break;
        case 'l': System.out.println("Lima"); break;
        case 'm': System.out.println("Mike"); break;
        case 'n': System.out.println("November"); break;
        case 'o': System.out.println("Oscar"); break;
        case 'p': System.out.println("Papa"); break;
        case 'q': System.out.println("Quebec"); break;
        case 'r': System.out.println("Romeo"); break;
        case 's': System.out.println("Sierra"); break;
        case 't': System.out.println("Tango"); break;
        case 'u': System.out.println("Uniform"); break;
        case 'v': System.out.println("Victor"); break;
        case 'w': System.out.println("Whiskey"); break;
        case 'x': System.out.println("X-ray"); break;
        case 'y': System.out.println("Yankee"); break;
        case 'z': System.out.println("Zulu"); break;
        default : System.out.println("out of range!"); break;

      }
  }
}

ws>javac Sample_21_13.java
ws>java Sample_21_13
Input [a-z]:

ws>javac Sample_21_13.java
ws>java Sample_21_13
Input [a-z]: f　<---自分で入力した
Foxtrot