Strings are used for storing text.
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";
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
String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; System.out.println("The length of the txt string is: " + txt.length());
More String Methods
There are many string methods available, for example
String txt = "Hello World"; System.out.println(txt.toUpperCase()); // Outputs "HELLO WORLD" System.out.println(txt.toLowerCase()); // Outputs "hello world"
Finding a Character in a String
indexOf() method returns the index (the position)
of the first occurrence of a specified text in a string
String txt = "Please locate where 'locate' occurs!"; System.out.println(txt.indexOf("locate")); // Outputs 7
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.