how can i get random sort in an array?

[diljava]

how can i accept only numeral with getKeyChar?

 

[sedj]

Try converting the value to an Integer. If it fails (ie its not a number) then it will throw NumberFormatException - you can catch this and take appropriate action.

 

[hologram]

If your use a JTextField to get your input you can use the following class "NumericInputField" which only accepts numeric keys and the backspace and delete keys. [Should also work for an Awt TextField].

import javax.swing.*;
import java.awt.event.*;

public class NumericInputField extends JTextField {

  public NumericInputField() {
    this.addKeyListener(new KeyAdapter() {
    public void keyTyped(KeyEvent e) {
      char c = e.getKeyChar();
      if (!((Character.isDigit(c)) ||
         (c == KeyEvent.VK_BACK_SPACE) ||
         (c == KeyEvent.VK_DELETE))) {
          getToolkit().beep();
          e.consume();
        }
      }
    });
  }

  public static void main(String args[]) {
    JFrame f = new JFrame("NumericExample");
    JTextField numField = new NumericInputField();
    f.getContentPane().add(numField);
    f.setSize(200,300);
    f.setVisible(true);
  }

}