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Strings in Java

1 Resources

  • What is a String?
  • What is a String?

    In Java, a String is much more than just a collection of characters—it is an immutable object with special memory handling in the String Pool.

    What is a Character?

    A Character is a single letter, number, or symbol enclosed within a single quote (' '). For example:

    char ch = 'A';

    What is a String?

    A String is a sequence of characters enclosed within double quotes (" "). For example:

    String str = "Hello";

    In Java, Strings are treated as objects, not just a simple collection of characters.

    Ways to Compare Strings

    • Using == operator: Compares the memory locations (references) of the strings.

    • Using equals() method: Compares the actual content of the strings.

    • Using compareTo() method: Compares strings character by character and returns an integer value.

    • Using equalsIgnoreCase() method: Compares strings while ignoring upper and lower case differences.

    Additional String Concepts

    Before writing code with strings, it is important to understand:

    • String Pool: Java optimizes memory usage by storing string literals in a common pool.

    • String Mutability: Since strings are immutable, modifying a string creates a new object instead of changing the original one.

    • StringBuffer and StringBuilder: These classes allow creating and modifying strings efficiently when frequent changes are needed.

    By understanding these concepts, you will be able to work efficiently with strings in Java.

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