Strings
Java Strings
Text can be stored in strings.
A group of characters enclosed in double quotations make up a String variable:
Example
Create a variable of type String and assign it a value:
String greeting = "Hello";
String Length
In Java, a string is essentially an object that has methods on it that may be used to manipulate strings. For instance, the length() method can be used to determine the length of a string:
Example
String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
System.out.println("The length of the txt string is: " + txt.length());
More String Methods
Numerous string methods exist, such as toLowerCase() and toUpperCase():
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
The index, or location, of the first instance of a given text in a string (including whitespace) is returned by the indexOf() method:
Example
String txt = "Please locate where 'locate' occurs!";
System.out.println(txt.indexOf("locate")); // Outputs 7
Java starts counting at zero.
In a string, 0 is the first place, 1 is the second, and 2 is the third.
