Toggle each character in a String In this java program we’re going to make a program to toggle each character in a String , First we will take String input from user .

If the letter is in uppercase we will convert it to lowercase and if it is in uppercase we will convert it to lowercase.

length of string without using strlen Algorithm Take String input from user and store in the variable “s” (in this case) Take another String variable s1 (in this case) Take a for loop i start from i=0 to i<s.length Take if part get one by one character from String using charAt() method and and check whether is it upper case using isUpperCase() and change upper case character to lower case and store it in s In else part change the variable from lower case to upper case and store it in s variable Code in Java Run import java.util.Scanner;

public class Main {

public static void main(String[] args) {
 String s = "PrePInsTa";
 String s1 = "";
 for (int i = 0; i < s.length(); i++) {
	if(Character.isUpperCase(s.charAt(i))) 
		 s1=s1+Character.toLowerCase(s.charAt(i));
	else 
		 s1=s1+Character.toUpperCase(s.charAt(i));
}
System.out.println("Toggle String is : "+s1);

}

} Output Enter a String : PrePInsTa Toggle String is : pREpiNStA Method 2 The Logic is same here we are using the ASCII value

Initialize the variables. Initiate a for loop. Toggle each character. Terminate the loop. Print toggled string. Run public class Main {

public static void main(String[] args) { String str1 = "PrepInsta"; char str[] = str1.toCharArray();

for (int i = 0; i < str1.length(); i++) { if (str[i] >= 'A' && str[i] <= 'Z') str[i] = (char)(str[i] + 'a' - 'A'); else if (str[i] >= 'a' && str[i] <= 'z') str[i]= (char)(str[i] + 'A' - 'a'); } System.out.println("Toggled string: "); for (int i = 0; i < str1.length(); i++) { System.out.print(str[i]); } } } Toggled string: pREPiNSTA Method 3 This program is the same as above, but this time we are using the While Loop.

Run public class Main {

public static void main(String[] args) {

    String str1 = "PrepInsta";
    char str[] = str1.toCharArray();
    int i = 0;

    while (i < str1.length()) {
        if (str[i] >= 'a' && str[i] <= 'z') {               
       str[i] = (char)(str[i] + 'A' - 'a');           

} else if (str[i] >= 'A' && str[i] <= 'Z') { str[i] = (char)(str[i] + 'a' - 'A'); } i++; }

    System.out.println("Toggled string: ");
    for (i = 0; i < str1.length(); i++) {
        System.out.print(str[i]);
    }
}

} Output Toggled string: pREPiNSTA