What is a string in Java?

What is a string in Java?

• In Java, a String is an object that represents an immutable sequence of characters. The String class is part of the java.lang package, which is automatically imported into all Java programs.

• Strings are used for storing text.

• A String variable contains a collection of characters surrounded by double quotes (""):

Creating Strings in Java
String Literal:

• A string literal is a string created using double quotes. These strings are stored in the String Constant Pool to save memory and reuse objects.

String s1 = "Hello";

Using new Keyword:

• When we create a string using the new keyword, Java creates a new object in heap memory even if the same value already exists.

String s2 = new String("Hello");

Key Characteristic's **
**1. Strings are Immutable

• Once a String object is created, its value cannot be changed.

String s = "Hello";
s.concat(" World");
System.out.println(s);

Output:
Hello 

2. String is a Class (not primitive)

• String is an object of String class from java.lang package.

String name = "Manoj";

3. Strings are Thread Safe

• Because they are immutable, they are automatically thread safe.

Reference
https://docs.oracle.com/javase/tutorial/java/data/strings.html
https://www.geeksforgeeks.org/java/strings-in-java/
https://docs.oracle.com/javase/8/docs/api/java/lang/String.html