Trivia questions and answers, drawn fresh from the well

• Easy Easy difficulty.
• Hashtags

Who is credited with inventing the hashtag on Twitter?

Answer

Chris Messina

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• Easy Easy difficulty.
• Hashtags

What is the common name for the # symbol used in social media hashtags?

Answer

Hash

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• Easy Easy difficulty.
• Java

Which package includes the System, String, and Math classes by default?

Answer

java.lang

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• Easy Easy difficulty.
• Java

Which Java keyword is used to instantiate an object?

Answer

new

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• Hard Hard difficulty.
• Java

What is the magic number at the start of a Java class file?

Answer

0xCAFEBABE

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• Easy Easy difficulty.
• Java

Which keyword is used to exit a loop prematurely in Java?

Answer

break

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• Easy Easy difficulty.
• Java

What is the file extension for compiled Java bytecode?

Answer

.class

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• Hard Hard difficulty.
• Java

What is the size in bits of a Java object reference when compressed OOPs are enabled?

Answer

32

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• Hard Hard difficulty.
• Java

What is the maximum number of constant pool entries allowed in a Java class file?

Answer

65534

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• Intermediate Intermediate difficulty.
• Java

What is the default initial capacity of a `StringBuilder` in Java?

Answer

16

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• Easy Easy difficulty.
• Java

What is the initial value of a boolean field in a Java class?

Answer

false

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• Hard Hard difficulty.
• Java

Which Java version removed the permanent generation (PermGen)?

Answer

Java 8

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