Consider the below two diagrams. The top one contains a plain arrow at the right end, and the bottom one contains an arrow with a diamond at the left end and a plain arrow at the right end. The great book GoF has usages of both of these two kinds of diagrams.

I want to understand what does the diamond signify in the second case, and which one of these two gives a stronger association between Customer and Order.

Is the Customer class responsible for the lifecycle of Order class in either of the two cases?

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design-patterns uml class-diagram
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