Question

Am using JTextField for get average.It means the average must be start with 0 to 100.so the textfield allow to access the 0 to 100 only.If I give 101 means the value don’t added in the textfield.how to set the condition for this problem?

Answer 1

You have to use KeyListener where you can do the validation.

For example

final JTextField myTextField = new JTextField();
myTextField.addKeyListener(new KeyListener() {
      public void keyPressed(KeyEvent keyEvent) {

      }

      public void keyReleased(KeyEvent keyEvent) {
// Here write the comparison logic
                 if (Integer.parseInt(myTextField.getText()) > 100){
                     myTextField.setText(""); // Make it blank
                 }
      }

      public void keyTyped(KeyEvent keyEvent) {
      }
    });

You can use KeyAdapter as well. Hope this helps.