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  • Michael ss thinks this is interesting:

h type of container has some layout manager attached to it. As you saw in the previous chapter, for panel objects the default layout manager is FlowLayout. For window objects, the default layout manager is BorderLayout. If you do not use a layout manager, the components are placed using absolute coordinates. In such a case, when the parent container is resized, or when a u

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window object和panel object都是有layout manager的container