java - Why is this JPanel not sticking to the specified size? -

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so, i'm trying learn java swing , custom components. i've created jframe, given background color, , added jpanel:

    jframe frame = new jframe("testing");     frame.setdefaultcloseoperation(jframe.exit_on_close);     frame.setsize(1000, 2000);     frame.setbackground(color.white);      jpanel jp = new jpanel();     jp.setbackground(color.blue);     jp.setsize(40, 40);     frame.add(jp);      frame.setvisible(true);

the result 1000x2000 window colored blue (as opposed white window 40x40 blue box inside it). why jpanel expanding beyond specified size?

using code, add 1 line change layoutmanager of jframe. then, when add component, keep it's preferred size.

also, instead of calling jp.setsize(40,40), call jp.setpreferredsize(new dimension(40,40)).

and, need call pack() on jframe tell layout components.

jframe frame = new jframe("testing"); frame.setlayout(new flowlayout()); // new line of code frame.setdefaultcloseoperation(jframe.exit_on_close); frame.setpreferredsize(new dimension(1000, 2000));  // modified line of code frame.setbackground(color.white);  jpanel jp = new jpanel(); jp.setbackground(color.blue); jp.setpreferredsize(new dimension(40, 40)); // modified line of code frame.add(jp);  frame.pack(); // added line of code frame.setvisible(true);

also, should read on of different layoutmanagers available you. here great tutorial.


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