Trivia questions and answers, drawn fresh from the well

• Easy Easy difficulty.
• Java

Which annotation is used to suppress compiler warnings in Java?

Answer

@SuppressWarnings

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• Hard Hard difficulty.
• Java

Which JVM command-line option is used to set the maximum heap size?

Answer

-Xmx

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• Hard Hard difficulty.
• Java

Which Java version standardized the 'record' keyword for data classes?

Answer

Java 16

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• Hard Hard difficulty.
• Java

What is the maximum number of dimensions allowed in a Java array?

Answer

255

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• Intermediate Intermediate difficulty.
• Java

Which interface must a class implement to be serializable in Java?

Answer

Serializable

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• Intermediate Intermediate difficulty.
• Java

Which version of Java introduced the module system (Project Jigsaw)?

Answer

Java 9

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• Intermediate Intermediate difficulty.
• Java

Which Java class implements the List interface using a dynamic array?

Answer

ArrayList

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• Intermediate Intermediate difficulty.
• Java

What is the name of the interface in java.util.function that takes two arguments and returns a result?

Answer

BiFunction

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• Intermediate Intermediate difficulty.
• Java

Which keyword is used to bring classes from a package into scope?

Answer

import

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• Intermediate Intermediate difficulty.
• Java

What is the name of the Java command-line tool that executes a compiled Java program?

Answer

java

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• Easy Easy difficulty.
• Java

Which keyword can be used to prevent a class from being extended?

Answer

final

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• Easy Easy difficulty.
• Java

What is the term for a special method that initializes a new object?

Answer

constructor

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