Nikos Maravitsas

About Nikos Maravitsas

Nikos has graduated from the Department of Informatics and Telecommunications of The National and Kapodistrian University of Athens. Currently, his main interests are system’s security, parallel systems, artificial intelligence, operating systems, system programming, telecommunications, web applications, human – machine interaction and mobile development.

Java String Contains Example

In this example we are going to see how you can check if a String contains another String in Java. The Java String Class API offers a method to do that, contains. To be more specific the complete signature of contains method is public boolean contains(CharSequence s). Which means that you are trying to see, whether a CharSequence s resides inside a String. A CharSequence is an interface that denotes a readable sequence of chars. It is used to provide uniformly read-only access to different kinds of char sequences. As you’ve probably seen in the documentation, String class implements CharSequence interface, among others like Serializable and Comparable<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 implement CharSequence interface. An example is StringBuilder.

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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