Basic String Operations with Implementation

Strings are one of the most commonly used data types in programming. In Java, a String represents a sequence of characters and provides many built-in methods to manipulate and process text data efficiently.

• Strings in Java are immutable, meaning their values cannot be changed after creation.
• The String class provides many built-in methods to perform common operations on text data.

Some Common String Operation

Let’s discuss some common String operations in Java along with their implementation.

Accessing characters by index in a string.

To access any character in a String, we need:

1. A non-empty string (say "s")
2. A position/index of the character from where it is to be accessed. (say "k")

Using this Approch the character can be easily accessed using the below syntax:

char ch = s.charAt(k);

Below is the implementation of the above approach:

Inserting Character/String into an String.

To insert any Character/String in a String, we need:

1. A character/string that is to be inserted in the string (say "ch")
2. A position/index of the Character/String where it is to be inserted. (say "k")

Below is the implementation of the above approach:

Original String : GeeksGeeks 
Modified String : GeeksforGeeks 

Modifying character in String

To modify any Character in a String, we need:

1. A character that is to replaced in the string (say "ch")
2. A position/index of the Character where it is to be replaced at. (say "k")

Below is the implementation of the above approach:

Original String = Geeks Gor Geeks
Modified String = Geeks For Geeks

Deletion of character in String

To delete any Character in a String, we need:

• A character that is to deleted in the string (say "ch")

Below is the implementation of the above approach:

eeksforeeks

Concatenating strings (combining multiple strings into one).

To concatenate any String to a String, we need:

• A string that is to appended with the string (say "ch")

Below is the implementation of the above approach:

this is init added now

Finding the length/size of a string

To find the length of the String, we need:

• A string for which the length/size is to be determined (say "str")

Below is the implementation of the above approach:

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Comparing Strings for Equality

String comparison is used to check if two strings are equal or to determine their lexicographic order.

• Equal: Both strings have exactly the same characters.
• Not Equal: Strings differ in one or more characters.
• Lexicographic Order: Determines which string comes first in dictionary order.