partofio.java

来自「Java 入门书的源码」· Java 代码 · 共 36 行

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

/* Shows the readInt method from the
 * Io class.
 */

import iopack.Io;
import java.io.*;
public class PartOfIo { 
  public static int readInt(String prompt) {
    boolean done = false;
    String s;
    int i=0;
    while (!done) {
      System.out.print(prompt+ ":  ");
      System.out.flush(); 
      try {
        BufferedReader in = new BufferedReader (
                              new InputStreamReader(System.in));
        s = in.readLine();
        i = Integer.parseInt(s);
        done = true; 
      }catch (IOException e){
        done = true;
      }catch (NumberFormatException e1){ 
        System.out.println("Error -- input an integer -- Try again");
      }  
    } 
    return i;
  }
  public static void main(String [] args) {
    System.out.println(readInt("Enter an integer"));
    Io.readString("Press any key to exit");   // Added for IDE use
  }
}