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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
Encapsulation with getter/setter
Easy
Jan 23, 2026
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Constructor overloading
Easy
Jan 23, 2026
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Method overriding basics
Easy
Jan 23, 2026
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Interface usage
Easy
Jan 23, 2026
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Immutable value object
Easy
Jan 23, 2026
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Copy constructor and defensive copy
Medium
Jan 23, 2026
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Comparable implementation
Medium
Jan 23, 2026
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Factory method pattern
Medium
Jan 23, 2026
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Composition over inheritance
Medium
Jan 23, 2026
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Polymorphic billing
Medium
Jan 23, 2026
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Strategy pattern for sorting key
Hard
Jan 23, 2026
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Thread-safe counter (synchronized)
Hard
Jan 23, 2026
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Deep clone object graph (simple)
Hard
Jan 23, 2026
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Builder pattern (basic)
Hard
Jan 23, 2026
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Equals/HashCode with inheritance (safe)
Hard
Jan 23, 2026
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