validateinput.java

Java 入门书的源码

//Copyright (c) 1998, Arthur Gittleman
//This example is provided WITHOUT ANY WARRANTY either expressed or implied.

/* Validates the index that the user inputs
 * so that the program doesn't abort.
 */

import iopack.Io;
public class ValidateInput{
  public static void main(String [] args) {
    int [] anArray = {5,6,7};
    int index = Io.readInt("Enter an index from 0 to 2"); 
    int value;
    if (index >= 0 && index <= 2){  
      value = anArray[index];
      System.out.println("Execution does not get here if index is bad");
    }
    else
      System.out.println("Stick with 0, 1, or 2"); 
    Io.readString("Press any key to exit");   // Added for IDE use
  }
}