21. What is the output of the following code in Java? `System.out.println("Hello" + 1 + 2 + 3);`
22. In Java, what is the purpose of the `compareTo` method in the Comparable interface?
23. Which data structure in Java is based on the Last-In-First-Out (LIFO) principle?
24. What is the default value of a local variable in Java if it is not explicitly initialized?
25. Which Java operator is used to perform bitwise AND between two integers?
26. What does the `finally` block in a Java `try-catch-finally` construct do?
27. In Java, which collection is typically implemented as a dynamic array that can grow or shrink in size?
28. What is the purpose of the `@Override` annotation in Java?
29. In Java, what is the role of the `System.arraycopy` method?
30. Which Java operator is used to perform a logical NOT operation?
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