How to modify/add code to the initComponents() method in Java using NetBeans?

Yes the initComponents method is read only to keep full control for the IDE. You may add yours in the constructor right after initComponents.

public class NewJFrame extends javax.swing.JFrame {

/** Creates new form NewJFrame */
public NewJFrame() {
    initComponents();
    myInitComponents();
}

public void myInitComponents() {
}

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