Mini Project Java Hands-On Solutions

The main agenda of this solution is those who are unable to do this course due to facing some issues, a little bit of lack of knowledge on these hands-on questions. Try to understand these codes and solve your hands-On Problems. (Not encourage copy and paste these solutions).

The Course Id: -  63716

1. Strings in Java

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class Solution{

    

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

        //complete the code

        char[] array = str.toCharArray();

        int count = 0;

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

            if(array[i] == ch){

                count++;

            }

        }

        return count;

    }

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

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

String str = reader.readLine();

char ch = (char)reader.read();

System.out.println(charSearch(str,ch));

}

}

2. Arrays in Java

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 */

        Scanner scanner = new Scanner(System.in);

        char[] ch = {'0','1','2','3','4','5','6','7','8','9'};

        int a = scanner.nextInt();

        String str = Integer.toString(a);

        int count = 0;

        for(int i=0;i<ch.length;i++){

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

                if(str.charAt(j) == ch[i])

                count++;

            }

        if(count>0){

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

            count = 0;

        }

        }

        

    }

}

3. Collections in Java:- 

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 */

        Scanner scanner = new Scanner(System.in);

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

        int n = scanner.nextInt(); 

        scanner.nextLine();

        while(n>0){

            String str =scanner.nextLine();

            String s[] = str.split(" ");

            hash.put(Integer.parseInt(s[0]), s[1]);

            n--;

        }

        int k = scanner.nextInt();

        if(hash.containsKey(k)){

            System.out.println(hash.get(k));

        }

        else{

            System.out.println("-1");

        }

    }

}

Thank You