How does hashset works in java?


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How many objects are created for a singleton class

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I have one Shopping cart application, i that i have selected some items, while clicking submit button by mistake i have clicked twice or trice, that time items are selected twice or trice. Actually i want only one copy of items but its selected twice or trice. So how can we avoid this problem?

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Is array an object in java?

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Read data from console and print in one file. That would be in C:\temp ? Thanks, Bose

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