Question – How do I check If a String contains another substring in Java? In our previous article, you learned to compare two strings in Java programming language. This tutorial will help you to check if the main string contains another substring in it.
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Syntax
1 2 | str1.contains(str2) // Case sensitive str1.toLowerCase().contains(str2.toLowerCase()) // Ignore case |
Example 1 – Check with Case Sensitive
This will be case sensitive check. As per the below example, Welcome is different than welcome as we know java is a case sensitive programming language.
1 2 3 4 | String str1 = "Hi, Welcome to TecAdmin"; str1.contains("Welcome") //Return True str1.contains("welcome") //Return false (due to case sensitive) |
Example 2 – Check with Ignoring Case
Using this string will be checked with ignoring the case. The function change string to lower case and check if one string contains another case.
1 2 3 4 5 6 | String str1 = "Hi, Welcome to TecAdmin"; String str2 = "welcome"; //The below code will change all charecters to lower case //Then compare strings, but do not change original content. str1.toLowerCase().contains(str2.toLowerCase()) //Return true |