how to move a panel over its parnet's component?

Dear all who could you give me some suggestion or example code to show how to move a JPanel over its parent? thank you so much. with regards

actually , i wanna develop a workflow editor basd-on java. I have defined each node of the workflow by inheritanted from JPanel. But I want to know how to move each node of workflow over the editor canvas as parent of each node. i think that is pretty much you need to know. thank u