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Java String Exercises: Count the number of triples (characters appearing three times in a row) in a given string

Java String: Exercise-86 with Solution

Write a Java program to count the number of triples (characters appearing three times in a row) in a given string.

Sample Solution:

Java Code:

import java.util.*;
public class Main
{
public int noOfTriples(String stng) 
{
  int l = stng.length();
  int ctr = 0;
  for (int i = 0; i < l-2; i++)
  {
    char tmp = stng.charAt(i);
    if (tmp == stng.charAt(i+1) && tmp == stng.charAt(i+2))
      ctr++;
  }
  return ctr;
}

public static void main (String[] args)
    {
      Main m= new Main();
      String str1 =  "welllcommmmeee";
      System.out.println("The given string is: "+str1);
      System.out.println("The number of triples in the string is: "+m.noOfTriples(str1));
	  }
}

Sample Output:

The given string is: welllcommmmeee
The number of triples in the string is: 4

Flowchart:

Flowchart: Java String Exercises - Count the number of triples (characters appearing three times in a row).

Java Code Editor:

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Next: Write a Java program to check whether a specified character is happy or not. A character is happy when the same character appears to its left or right in a string.

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Java: Tips of the Day

Count the number of occurrences of a char in a String:

int count = StringUtils.countMatches("a.b.c.d", ".");

Ref: https://bit.ly/2OTy6sG