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Practice Zone • Java
10 Topics 15 Questions All Difficulty
Topics
All Questions Full list for Java 151 Arrays Practice Arrays with real questions. 15 Collections Practice Collections with real questions. 17 Control Flow Practice Control Flow with real questions. 15 Data Types Practice Data Types with real questions. 15 Exceptions Practice Exceptions with real questions. 15 Java Arrays Practice Java Arrays with real questions. 15 Methods Practice Methods with real questions. 14 OOP Basics Practice OOP Basics with real questions. 15 Operators Practice Operators with real questions. 15 Variables Practice Variables with real questions. 15
Questions
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Swap two elements
Easy
Jan 23, 2026
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Copy array manually
Easy
Jan 23, 2026
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Find first occurrence
Easy
Jan 23, 2026
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Count occurrences
Easy
Jan 23, 2026
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Find minimum value
Easy
Jan 23, 2026
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Reverse a subrange
Medium
Jan 23, 2026
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Remove element (new length)
Medium
Jan 23, 2026
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Merge two arrays alternately
Medium
Jan 23, 2026
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Prefix sum array
Medium
Jan 23, 2026
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Find majority element (Boyer-Moore)
Medium
Jan 23, 2026
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Find intersection of two arrays (unique)
Hard
Jan 23, 2026
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Minimum window size for sum >= target
Hard
Jan 23, 2026
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Rearrange array by sign (stable)
Hard
Jan 23, 2026
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Count inversions (merge sort)
Hard
Jan 23, 2026
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Product of array except self
Hard
Jan 23, 2026
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