substring()

substring()

A part of String is called substring. In other words, substring is a subset of another String. Java String class provides the built-in substring() method that extract a substring from the given string by using the index values passed as an argument. In case of substring() method startIndex is inclusive and endIndex is exclusive.

Usage and examples :

String s = "Hello World";
String a = s.substring(0 , 5); // "Hello"
String b = s.substring(0, 7); // "Hello W"
String c = s.substring(0); // "Hello World"
/*The line below will cause an error and will throw 
java.lang.StringIndexOutOfBoundsException*/
String d = s.substring(100);