what is string in java with example

Vincent 167 Published: 12/05/2024

what is string in java with example

I apologize for any frustration caused earlier.

In Java, a String is an immutable class representing a sequence of characters. It's one of the most used classes in Java programming. Strings can be represented as literal text or as the result of concatenating other strings.

Here are some key features and methods of the String class:

Immutable: Once created, a string cannot be changed. Any attempt to modify it will create a new string instead. Character Array: A string is stored internally as an array of characters, known as a character sequence.

Concatenation: Strings can be concatenated using the + operator or the concat() method.

Example:

String hello = "Hello"; // literal string

String world = "World"; // literal string


// Concatenating strings using +


String helloWorld = hello + " " + world;


System.out.println(helloWorld); // prints "Hello World"


// Using concat() method


helloWorld = hello.concat(" ").concat(world);


System.out.println(helloWorld); // prints "Hello World"

In this example, we create two String objects, hello and world. We then use the + operator to concatenate them with a space in between, creating a new String object helloWorld. We also demonstrate using the concat() method to achieve the same result.

Length: You can get the length (or size) of a string using the length() method. 
int length = hello.length();

System.out.println("Hello's length is: " + length); // prints 5
Substring: You can extract a substring from an existing string using the substring() method.

Example:

String greeting = "Hello World";

String hello = greeting.substring(0, 5);


System.out.println(hello); // prints "Hello"

In this example, we create a string greeting and use the substring() method to extract the substring "Hello" from it.

Formatting: Strings can be formatted using various methods, such as printf(), format(), or String.format().

Example:

String name = "John";

int age = 30;


String message = String.format("My name is %s and I'm %d years old.", name, age);


System.out.println(message); // prints "My name is John and I'm 30 years old."

In this example, we create a string message using the String.format() method, which replaces placeholders (%s and %d) with actual values.

These are just some of the many features and methods available for working with strings in Java. Mastering these will help you write efficient and effective code!

what is string in java with example

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