Mini-Project - Core JAVA Hands-on solution | TCS Fresco Play

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1. Array Count

import java.io.*;

import java.util.*;

import java.text.*;

import java.math.*;

import java.util.regex.*;

public class Solution {

    public static void main(String args[] ) throws Exception {

        /* Enter your code here. Read input from STDIN. Print output to STDOUT */

        int[] arr=new int[10];

        for(int i=0;i<10;i++)

        arr[i]=0;

        Scanner sc=new Scanner(System.in);

        String text=sc.next();

        for(int i=0;i<text.length();i++)

        {

            arr[Integer.parseInt(text.substring(i,i+1))]++;

        }

        for(int i=0;i<10;i++)

        {

            if(arr[i]!=0)

            System.out.println(i+": "+arr[i]);

        }

    }

}

2. Collections

import java.io.*;

import java.util.*;

import java.text.*;

import java.math.*;

import java.util.regex.*;

public class Solution {

    public static void main(String args[] ) throws Exception {

        /* Enter your code here. Read input from STDIN. Print output to STDOUT */

        HashMap<Integer, String> ppl = new HashMap<Integer, String>();

        Scanner sc=new Scanner(System.in);

        int n=sc.nextInt();

        while(n-->0)

        {

            // System.out.println(sc.nextInt());

            int num=sc.nextInt();

            String val=sc.nextLine();

            // System.out.println(val);

            val=val.trim();

            ppl.put(num,val);

        }

        int num=sc.nextInt();

        if(ppl.containsKey(num))

            System.out.println(ppl.get(num));

        else

            System.out.println(-1);  

    }

}

3. Strings Count

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.*;

public class Solution{

    public static int charSearch(String str,char ch){

        //complete the code

        HashMap<Character,Integer> chrs = new HashMap<Character,Integer>();

        for(int i=0;i<str.length();i++)

        {

            chrs.put(str.charAt(i),chrs.getOrDefault(str.charAt(i),0)+1);

        }

        return chrs.getOrDefault(ch,0);

    }

public static void main(String[] args) throws IOException {