Java Values and Data Types Flashcard

Front

What are the primitive data types in Java? Options: string, array, object, null, undefined; integer, decimal, boolean, character, void; int, long, float, double, boolean, char, and byte; true, false, null, undefined, NaN

Back

int, long, float, double, boolean, char, and byte

Front

Explain the difference between int and double data types in Java.

Back

int stores whole numbers, while double stores decimal numbers.

Front

What are the numeric data types in Java?

Back

byte, short, int, long, float, and double

Front

How is a char data type represented in Java? Options: 'char', boolean, double, int

Back

'char'

Front

What is the boolean data type used for in Java?

Back

To represent true or false values

Front

Explain the concept of true and false in boolean data type in Java.

Back

The boolean data type in Java represents true or false values.

Front

What is the string data type in Java?

Back

String

Front

How do you declare and initialize a string variable in Java? Options: int variableName = 'initial value';, String variableName = initial value;, String variableName = new String('initial value');, String variableName = "initial value";

Back

String variableName = "initial value";

Front

What are the different methods available for string manipulation in Java? Options: add(), remove(), concat(), indexOf(), split(), join(), reverse(), isEmpty(), substring(), length(), charAt(), toUpperCase(), toLowerCase(), trim(), replace(), toUpperCaseFirstLetter(), toUpperCaseLastLetter(), toUpperCaseVowels(), toUpperCaseConsonants()

Back

substring(), length(), charAt(), toUpperCase(), toLowerCase(), trim(), replace()

Front

Explain the concept of string immutability in Java.

Back

Once a string object is created, it cannot be changed or modified.