My fith program: Password Generator

[Project Evolution]

Code:

Random randomGen = new Random();
    private String randomizeInt() {
        int toInt = Integer.parseInt(jTextField4.getText());
        int randomIndex = randomGen.nextInt(toInt);
        String randomString = Integer.toString(randomIndex);
        return randomString;
    }

Code:

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
        jTextField5.setText(randomizeInt());
    }