set size wont work in java

Question

public void start_Gui() {

    JFrame window = new JFrame(\"Client Program\");
    window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);

    JPanel panel = new JP         


        

Answer 1

but setXxxSize (for ContainersChilds) works as chaims if you change from setSize() (for TopLayoutContainer) to setPreferredSize() and you have to call pack() before setVisible()