Count how many times the substring appears in the larger String in Java

Let’s say we have the following string.

String str = "Learning never ends! Learning never stops!";

In the above string, we need to find out how many times the substring “Learning” appears.

For this, loop until the index is not equal to 1 and calculate.

while ((index = str.indexOf(subString, index)) != -1) { subStrCount++; index = index + subString.length(); }

The following is an example.

Example

 Live Demo

public class Demo {    public static void main(String[] args) {       String str = "Learning never ends! Learning never stops!";       System.out.println("String: "+str);       int subStrCount = 0;       String subString = "Learning";       int index = 0;       while ((index = str.indexOf(subString, index)) != -1) {          subStrCount++;          index = index + subString.length();       }       System.out.println("Substring "+subString+" found "+subStrCount+" times!");    } }

Output

String: Learning never ends! Learning never stops! Substring Learning found 2 times!