Question

Modify the code to turn the text area background to the color YELLOW if you click an "x" (lower or uppercase)?

package com.java24hours; import javax.swing.*; import java.awt.event.*; import java.awt.*; public class KeyViewer extends JFrame implements KeyListener { JTextField keyText = new JTextField(80); JLabel keyLabel = new JLabel("Press any key in the text field."); public KeyViewer() { super("KeyViewer"); set LookAndFeel(); setSize(350, 100); setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE) ; keyText.addKeyListener(this); BorderLayout bord = new BorderLayout(); set Layout (bord); add (keyLabel, BorderLayout. NORTH); add (keyText, BorderLayout. CENTER); setVisible(true); @Override public void keyTyped (KeyEvent input) { char key = input.getKeychar(); key Label.setText("You pressed " + key); @Override public void keyPressed (KeyEvent txt) { // do nothing

Answer 1

Replace your existing keyTyped() method code code with the one given below.

@Override
public void keyTyped(KeyEvent input) {
   char key = input.getKeyChar();
   if(key == 'x' || key == 'X') {
       keyText.setBackground(Color.yellow);
   }
}