Question

Write a program in Java to enter a string in mixed case. Arrange all the alphabets of the
string in such a way that all the lower case characters are followed by the upper case

characters.
Sample Input : Computer Science

Sample Output : omputercienceCS​

Answer 1

Answer:

import java.util.*;

public class MixedCase

{

public static void main()

{

Scanner sc = new Scanner(System.in);

System.out.println("Enter the string=");

String str = sc.nextLine();

char a; String str1="", str2="", str3="";

int i;

int l = str.length();

for(i=0;i<l;i++)

{

a=str.charAt(i);

if(Character.isUpperCase(a)==true)

{

str1+=a;

}

else if(Character.isLowerCase(a)==true)

{

str2+=a;

}

else

{

str3+=a;

}

}

System.out.println("Lower case characters followed by upper case=");

System.out.println(str2+""+str1);

}

}

Answer 2

Answer:

import java.util.*;

public class StringLowerThenUpper

{

   public static void main(String args[]) {

       Scanner in = new Scanner(System.in);

       System.out.print("Enter string: ");

       String str = in.nextLine();

       int len = str.length();

       StringBuffer sbLowerCase = new StringBuffer();

       StringBuffer sbUpperCase = new StringBuffer();

       

       for (int i = 0; i < len; i++) {

           char ch = str.charAt(i);

           if (Character.isLowerCase(ch))

               sbLowerCase.append(ch);

           else if (Character.isUpperCase(ch))

               sbUpperCase.append(ch);

       }

     

       System.out.println("Input String:");

       System.out.println(str);

       String newStr = sbLowerCase.append(sbUpperCase).toString();

       System.out.println("Changed String:");

       System.out.print(newStr);

   }

}

Explanation: