1-) Java - PANEL UZERİNDEKİ LABELLERİ DEGİSTİR

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {

Component[] c = jPanel1.getComponents();

for (int i = 0; i < c.length; i++) {

if (c[i] instanceof JLabel) {

JLabel tmp = (JLabel) c[i];

tmp.setForeground(Color.red);

tmp.setText("frame label"); } } }