contain – Make Me Engineer

Java ArrayList Contain always return false although it contain the same value

June 1, 2023 by Tarik

You need to override the equals method herited from the Object class (and hence also hashCode to respect the contract, see Why do I need to override the equals and hashCode methods in Java? ) in your Hole class. Returns true if this list contains the specified element. More formally, returns true if and only … Read more

Java check if two rectangles overlap at any point

May 15, 2023 by Tarik

Background: A rectangle can be defined by just one of its diagonal. Let’s say the first rectangle’s diagonal is (x1, y1) to (x2, y2) And the other rectangle’s diagonal is (x3, y3) to (x4, y4) Proceeding: Now, if any of these 4 conditions is true, we can conclude that the rectangles are not overlapping: x3 … Read more

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