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String contains() and indexOf() Example - Check String for SubString

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Javin Paul

Posts: 414
Nickname: javinpaul
Registered: Jan, 2012

Javin Paul is Java Programmer working on Finance domain.
String contains() and indexOf() Example - Check String for SubString Posted: Oct 18, 2012 9:32 AM
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Some time you want to check if one String contains another String or SubString or not e.g. "HelloWorld" contains "Hello" and "World" SubString. There are many ways to check SubString in String in Java e.g. contains(), indexOf() or matches() method of java.lang.String class. In our last article we have seen how to use matches method of String class with regular expression and In this article we will see example of contains() and indexOf() method to check any String or SubString in Java. contains and indexOf method are defined in java.lang.String class and used to check if String contains a particular SubString or not, only difference between contains() and indexOf() method is that, contains is added in Java 5 along with String matches() method while indexOf() is as old as equals(), hashCode and compareTo(). Another difference between contains() and indexOf() method is that contains() return boolean value e.g. true if String contains SubString and false if String doesn't contains SubString but indexOf() return int value, which is actually index of SubString i.e. starting location. indexOf() return -1 if source String does not contain SubString in Java.
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