In this example we are going to see how you can check if aString contains anotherString in Java. The Java String Class API offers a method to do that,contains. To be more specific the complete signature ofcontains method ispublic boolean contains(CharSequence s). Which means that you are trying to see, whether aCharSequences resides inside a String. ACharSequence is an interface that denotes a readable sequence ofchars. It is used to provide uniformly read-only access to different kinds ofchar sequences. As you’ve probably seen in the documentation,String class implementsCharSequence interface, among others likeSerializable andComparable<String>.

Let’s see how you can use it :

StringContainsExample.java

package com.javacodegeeks.core.string;public class StringContainsExample {public static void main(String[] args){System.out.println("abcdefghiklmpo".contains("cde"));}}

The above program will check if the string"abcdefghiklmpo" contains the string"cde". It will output:

true

As you might imagine, you can use contains with all other classes that implementCharSequence interface. An example isStringBuilder.

Let’s see how you can use it:

StringContainsExample.java

package com.javacodegeeks.core.string;public class StringContainsExample {public static void main(String[] args){StringBuilder sBuilder = new StringBuilder();sBuilder.append("Java").append(" ").append("Code").append(" ").append("Geeks");System.out.println("Java Code Geeks are awsome".contains(sBuilder));}}

This will output:

true

This was a Java String Contains Example.

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