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Oh ok ok.. I'm new to here. I should let him solve. Anyway. Thanks 4 ur reply

@ Norm : What's the Mistake i did?

--- Update ---

I just corrected the mistake he did. Not Spoonfeeded.

public void deliveryWindow(){

JFrame newFrame = new JFrame("Delivery Details");

Container pane = getContentPane();
newFrame.setLayout(new FlowLayout());
newFrame.setSize(new Dimension(250,...