Trivia questions and answers, drawn fresh from the well

• Intermediate Intermediate difficulty.
• Java

Which version of Java introduced the 'assert' keyword?

Answer

Java 1.4

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• Easy Easy difficulty.
• Java

What is the parent class of all Java classes?

Answer

Object

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• Hard Hard difficulty.
• Java

What is the name of the field that identifies a serializable class's version?

Answer

serialVersionUID

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• Hard Hard difficulty.
• Java

Which Java bytecode instruction is used to invoke a static method?

Answer

invokestatic

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• Hard Hard difficulty.
• Java

What is the maximum number of elements a Java array can hold?

Answer

2,147,483,647

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• Intermediate Intermediate difficulty.
• Java

What is the name of the technique where multiple methods share the same name but have different parameters?

Answer

method overloading

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• Intermediate Intermediate difficulty.
• Java

Which functional interface in java.util.function takes one argument and returns a boolean?

Answer

Predicate

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• Intermediate Intermediate difficulty.
• Java

What is the name of the utility class providing static methods for collections in Java?

Answer

java.util.Collections

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• Hard Hard difficulty.
• Java

Which version of Java finalized the sealed class feature?

Answer

Java 17

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• Hard Hard difficulty.
• Java

What is the maximum number of local variables allowed in a Java method (per JVM spec)?

Answer

65535

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• Intermediate Intermediate difficulty.
• Java

What is the name of the exception thrown when accessing a member of a null object?

Answer

NullPointerException

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• Intermediate Intermediate difficulty.
• Java

Which version of Java introduced default methods in interfaces?

Answer

Java 8

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