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Help understanding excersise

 
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Can somebody help me understand what im supposed to be doing here I dont understand the question how should I think to solve this problem.

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Hello Meki

You might find these threads useful:
Understanding Objects and Reference Variables
Head First into Java - A Heap o Trouble
 
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They want to you to draw a line which tells which reference variables stores which references.
 
Don't get me started about those stupid light bulbs.
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