Learn JAVA #9

Java Strings

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";

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());

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"

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


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