Java Program - convert upper to lower and lower to upper for given string

 Question:

Write a Java program to convert upper to lower and lower to upper character for given String.

Input: "SeleniumTesting"

Output: "sELENIUMtESTING"


Steps:

Step 1: Initialize the input string in main method;

Step 2: Create charConversion()  method;

Step 3: Initialize the StringBuffer object;

Step 4: Iterate the for loop to check whether the given character is lower or upper using isLowerCase() and isUpperCase();

Step 5: Convert the character and add it into Stringbuffer using setCharAt() method;

Step 6: Finally print the output



public class lowerAndUpperConversion {

    public static void main(String[] args) {

      String name ="SeleniumTesting";

     charConversion(name);

  }

    

  public static void charConversion(String name){

    StringBuffer strBuff=new StringBuffer(name);

    //Logic too convert the lower to upper and upper to lower

    for(int i=0;i<name.length();i++){

      if(Character.isLowerCase(name.charAt(i))){

        strBuff.setCharAt(i,Character.toUpperCase(name.charAt(i)));

      }else if(Character.isUpperCase(name.charAt(i))){

        strBuff.setCharAt(i,Character.toLowerCase(name.charAt(i)));

      }

   }

    System.out.println(strBuff);

  }

 }


Output:

sELENIUMtESTING



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