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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
Open List
Check if value fits in byte
Easy
Jan 23, 2026
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Convert char digit to int
Easy
Jan 23, 2026
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Absolute difference as long
Easy
Jan 23, 2026
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Check if string is numeric (no sign)
Easy
Jan 23, 2026
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Parse binary string to int
Easy
Jan 23, 2026
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Clamp value in range
Medium
Jan 23, 2026
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Compare doubles with epsilon
Medium
Jan 23, 2026
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Count set bits in int
Medium
Jan 23, 2026
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Safe average without overflow
Medium
Jan 23, 2026
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Detect overflow on add
Medium
Jan 23, 2026
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Convert seconds to hh:mm:ss parts
Hard
Jan 23, 2026
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Fast power (pow)
Hard
Jan 23, 2026
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Encode two ints into one long
Hard
Jan 23, 2026
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Compute checksum mod 1e9+7
Hard
Jan 23, 2026
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Split integer into digits array
Hard
Jan 23, 2026
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