Tell me why layout

Hi friend,
I how how to use layouts. But i feel it is difficult to design a form with layouts. instead of that i can create a form with null layout and i can drag and drop the components using any visual tool.
I think in java they have many classes for layout and still they are adding more layouts. So what is the primary advantage of layout. while i design a ui, what r the design constraints i have to follow(like layout, etc)?

It's more than that. Different OSes have different default font sizes which result in different preferred sizes. Thus, the preferred size from OS to OS is different. This means that even though the top x, y position of the component will be the same, the size is different, thus resulting in a GUI that either has overlapping components or too much space between components.

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