Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
_________________

// Geek.java

public class Geek {
private String name;
private int cntAnswered;
public Geek(String name) {
   this.name = name;
}
public String getName() {
   return name;
}
public int getNumberOfQuestions()
{
   return cntAnswered;
}
public boolean isEven(int num)
{
   cntAnswered++;
   if(num%2==0)
   {
       return true;
   }
   else
   {
       return false;
   }

}

public String multiConcat(String test,int count)
{
   cntAnswered++;
   String newStr="";
   for(int i=0;i<count;i++)
   {
       newStr+=test;
   }
   return newStr;
}
public int sumRange(int num1,int num2)
{
   cntAnswered++;
   int sum=0;
   if(num1==num2)
   {
       sum=0;
   }
   else if(num1>num2)
   {
       sum=0;
   }
   else
   {
       for(int i=(num1+1);i<num2;i++)
       {
           sum+=i;
       }
   }
   return sum;
}
public boolean isSorted(int num1,int num2,int num3)
{
cntAnswered++;
   if(num1<num2 && num1<num2 && num2<num3)
   {
       return true;
   }
   else
   {
       return false;
   }
}
public int countA(String test)
{
   cntAnswered++;
   int cnt=0;
   for(int i=0;i<test.length();i++)
   {
       if(test.charAt(i)=='a' || test.charAt(i)=='A')
       {
           cnt++;
       }
   }
   return cnt;
}
public boolean isPrime(int n)
{
   cntAnswered++;
// If the user entered number is '2' return true
if (n == 2)
return true;
for (int i = 2; i * i <= n; i++) {
if (n % i == 0)
return false;
}
return true;

}
public int countDigits(int num)
{
   cntAnswered++;
int t = num;
int remainder,cnt=0;

while (t != 0)
{
remainder = t % 10;
cnt++;
t = t / 10;
}
return cnt;
}

}

___________________________

// Test.java

import java.util.Scanner;

public class Test {

   public static void main(String[] args) {
       char choice;
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);
Geek g=null;
       while(true)
       {
           //Getting the input entered by the user
System.out.println("Command Options");
System.out.println("---------------------------");
System.out.println("a: Get name");
System.out.println("b : Num of questions asked");
System.out.println("c : Is it even");
System.out.println("d : Multi Concat");
System.out.println("e : Range between two integers");
System.out.println("f : isSorted");
System.out.println("g : count a");
System.out.println("h : count digits");
System.out.println("i : is it prime");
System.out.println("? : Display");
System.out.println("q : quit");
System.out.println("Please enter a command or type ?");
choice=sc.next(".").charAt(0);

switch(choice)
{
case 'a':
case 'A':
{
   sc.nextLine();
   String name=sc.nextLine();
   g=new Geek(name);
   continue;
}
case 'b':
case 'B':
{
   System.out.println(g.getNumberOfQuestions());
   continue;
}
case 'c':
case 'C':
{
   System.out.print("Enter a number :");
   int num=sc.nextInt();
   boolean b=g.isEven(num);
   if(b)
   {
       System.out.println(num+" is even.");
   }
   else
   {
       System.out.println(num+" is not even.");
   }
   continue;
}
case 'd':
case 'D':
{
   String str;
   int cnt;
   System.out.print("Enter a String :");
   str=sc.next();
   System.out.print("Enter an integer :");
   cnt=sc.nextInt();
   System.out.println(g.multiConcat(str,cnt));
   continue;
}
case 'e':
case 'E':
{
   int first,second;
   System.out.print("Enter the first number :");
   first=sc.nextInt();
   System.out.print("Enter the second number :");
   second=sc.nextInt();

   System.out.println("Sum of integers of "+first+" and "+second+" is "+g.sumRange(first,second));


   continue;
}
case 'f':
case 'F':
{
   int a,b,c;
   System.out.print("Enter three number :");
   a=sc.nextInt();
   b=sc.nextInt();
   c=sc.nextInt();
   boolean bool=g.isSorted(a,b,c);
   if(bool)
   {
       System.out.println("Sorted!");
   }
   else
   {
       System.out.println("Not Sorted!");
   }
   continue;
}
case 'g':
case 'G':
{
   String str;
   System.out.print("Enter a string :");
   str=sc.next();
   System.out.println("The String \""+str+"\" has "+g.countA(str)+" a(s)");

   continue;
}
case 'h':
case 'H':
{
   System.out.print("Enter an integer :");;
   int num=sc.nextInt();
   System.out.println("Number of digits in "+num+" is "+g.countDigits(num));
   continue;
}
case 'i':
case 'I':
{
   int num;
   System.out.print("Enter an number :");;
   num=sc.nextInt();
   System.out.println(num+" is not prime.");
   continue;
}
case '?':
{
   continue;
}
case 'q':
case 'Q':
{
   break;
}

default:{

}

}

break;
       }





   }

}

_____________________________

Output:

Command Options
---------------------------
a: Get name
b : Num of questions asked
c : Is it even
d : Multi Concat
e : Range between two integers
f : isSorted
g : count a
h : count digits
i : is it prime
? : Display
q : quit
Please enter a command or type ?
a
Williams
Command Options
---------------------------
a: Get name
b : Num of questions asked
c : Is it even
d : Multi Concat
e : Range between two integers
f : isSorted
g : count a
h : count digits
i : is it prime
? : Display
q : quit
Please enter a command or type ?
b
0
Command Options
---------------------------
a: Get name
b : Num of questions asked
c : Is it even
d : Multi Concat
e : Range between two integers
f : isSorted
g : count a
h : count digits
i : is it prime
? : Display
q : quit
Please enter a command or type ?
c
Enter a number :67
67 is not even.
Command Options
---------------------------
a: Get name
b : Num of questions asked
c : Is it even
d : Multi Concat
e : Range between two integers
f : isSorted
g : count a
h : count digits
i : is it prime
? : Display
q : quit
Please enter a command or type ?
d
Enter a String :Fun
Enter an integer :4
FunFunFunFun
Command Options
---------------------------
a: Get name
b : Num of questions asked
c : Is it even
d : Multi Concat
e : Range between two integers
f : isSorted
g : count a
h : count digits
i : is it prime
? : Display
q : quit
Please enter a command or type ?
q


_______________Could you plz rate me well.Thank You