//cd d:\JavaTry\Application1
//javac Hexa2.java
//set CLASSPATH=.
//java Hexa2 15

class Hexa2 {
  public static void main(String[] args) {
    String s= args[0];
    int n=Integer.valueOf(s).intValue();
    System.out.println("Decimal: " + s );
    System.out.println("Binary: " + Integer.toBinaryString(n));
    System.out.println("Hexa: " + Integer.toHexString(n).toUpperCase());
  }
}
/*
D:\JavaTry\Application1>java Hexa2 15
Decimal: 15
Binary: 1111
Hexa: f

コマンドライン引数を忘れると下記エラー。
C:\JavaTry\Application1>java Hexa2
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
        at Hexa2.main(Hexa2.java:8)
*/