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private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

String a=jTextField1.getText();

int x=a.length();

jTextField2.setText(Integer.toString(x));

String b=a.toLowerCase();

jTextField3.setText(b);

String c=a.toUpperCase();

jTextField4.setText(c);

Q13. To check if entered character is a vowel.