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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
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!
Updated on: 27-Jun-2020
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