Tutorials References Exercises Bootcamp Menu
Sign Up Create Website Get Certified Pro

Java Tutorial

Java HOME Java Intro Java Get Started Java Syntax Java Output Java Comments Java Variables Java Data Types Java Type Casting Java Operators Java Strings Java Math Java Booleans Java If...Else Java Switch Java While Loop Java For Loop Java Break/Continue Java Arrays

Java Methods

Java Methods Java Method Parameters Java Method Overloading Java Scope Java Recursion

Java Classes

Java OOP Java Classes/Objects Java Class Attributes Java Class Methods Java Constructors Java Modifiers Java Encapsulation Java Packages / API Java Inheritance Java Polymorphism Java Inner Classes Java Abstraction Java Interface Java Enums Java User Input Java Date Java ArrayList Java LinkedList Java HashMap Java HashSet Java Iterator Java Wrapper Classes Java Exceptions Java RegEx Java Threads Java Lambda

Java File Handling

Java Files Java Create/Write Files Java Read Files Java Delete Files

Java How To

Add Two Numbers Count Words Reverse a String

Java Reference

Java Keywords Java String Methods Java Math Methods

Java Examples

Java Examples Java Compiler Java Exercises Java Quiz Java Certificate

Java Strings

Java Strings

Strings are used for storing text.

A String variable contains a collection of characters surrounded by double quotes:


Create a variable of type String and assign it a value:

String greeting = "Hello";

Try it Yourself »

String Length

A String in Java is actually an object, which contain methods that can perform certain operations on strings. For example, the length of a string can be found with the length() method:


System.out.println("The length of the txt string is: " + txt.length());

Try it Yourself »

More String Methods

There are many string methods available, for example toUpperCase() and toLowerCase():


String txt = "Hello World";
System.out.println(txt.toUpperCase());   // Outputs "HELLO WORLD"
System.out.println(txt.toLowerCase());   // Outputs "hello world"

Try it Yourself »

Finding a Character in a String

The indexOf() method returns the index (the position) of the first occurrence of a specified text in a string (including whitespace):


String txt = "Please locate where 'locate' occurs!";
System.out.println(txt.indexOf("locate")); // Outputs 7

Try it Yourself »

Java counts positions from zero.
0 is the first position in a string, 1 is the second, 2 is the third ...

Complete String Reference

For a complete reference of String methods, go to our Java String Methods Reference.

The reference contains descriptions and examples of all string methods.

Test Yourself With Exercises


Fill in the missing part to create a greeting variable of type String and assign it the value Hello.

 greeting = ;

Start the Exercise