What is String in Java?

What is String in Java?

• A. A class in java.lang used to represent sequences of characters
• B. A primitive type
• C. An interface
• D. A keyword

Answer: (A)

String is a class in the Java standard library, located in the java.lang package, used to represent sequences of characters. It is not a primitive type, so you don’t declare strings with a special keyword like int or boolean. It is not an interface, and it is not a keyword—“String” is simply the name of a class. Strings are immutable, meaning once a String object is created, its characters cannot be changed; operations that seem to modify a string actually produce new String objects. You can create strings with literals like "hello," which are automatically available without an import due to being in java.lang, and the class provides many methods for working with text (length, charAt, substring, indexOf, equals, compareTo, etc.). While using the + operator is convenient for combining strings, concatenating in a loop is better done with a StringBuilder for performance.

String is a class in the Java standard library, located in the java.lang package, used to represent sequences of characters. It is not a primitive type, so you don’t declare strings with a special keyword like int or boolean. It is not an interface, and it is not a keyword—“String” is simply the name of a class. Strings are immutable, meaning once a String object is created, its characters cannot be changed; operations that seem to modify a string actually produce new String objects. You can create strings with literals like "hello," which are automatically available without an import due to being in java.lang, and the class provides many methods for working with text (length, charAt, substring, indexOf, equals, compareTo, etc.). While using the + operator is convenient for combining strings, concatenating in a loop is better done with a StringBuilder for performance.