Strings-String Compression [codingblocks]

Take as input S, a string. Write a function that does basic string compression. Print the value returned. E.g. for input “aaabbccds” print out a3b2c2ds.

Input Format
A single String S.

Constraints
A string of length between 1 to 1000

Output Format
The compressed String.

Sample Input
aaabbccds

Sample Output

a3b2c2ds

Explanation
In the given sample test case 'a' is repeated 3 times consecutively, 'b' is repeated twice, 'c' is repeated twice. But, 'd' and 's' occurred only once that's why we do not write their occurrence.

Java Code:

IDE Code: https://ide.geeksforgeeks.org/btZOsVDRAd

/*
Amit Kumar
14-12-2020
IDE Code: https://ide.geeksforgeeks.org/btZOsVDRAd
*/

package String;
import java.util.Scanner;

public class Strings_StringCompression {
    public static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args) {
        String str = scanner.next();
        StringBuilder stringBuilder = new StringBuilder();
        int count = 1;
        for (int i=1; i<str.length(); i++) {
            if (str.charAt(i-1) == str.charAt(i)) {
                count ++;
            } else {
                stringBuilder.append(str.charAt(i-1));
                if (count != 1)
                    stringBuilder.append(count);
                count = 1;
            }
        }
        stringBuilder.append(str.charAt(str.length()-1));
        if (count != 1)
            stringBuilder.append(count);
        System.out.println(stringBuilder.toString());
    }
}