Java program to print all upper case and lower case Alphabets

In this article, we will discuss the concept of Java program to print all upper case and lower case Alphabets

In this post, we are going to learn how to display all the upper case and lower case Alphabets using loops in Java language

Code to print all upper case and lower case

Code to print all Alphabets using for loop

The program displays all the upper case and lower case alphabets letters from a to z using for loop in Java language

Program 1

public class Display_Alphabets{
public static void main(String args[]){
char ch;//char variable declaration
//Printing upper case Alphabets
System.out.println("Uppercase Alphabets are: \n");
for(ch='A'; ch<='Z'; ch++){
System.out.print(ch+" ");
//display uppercase Alphabets with space
}
System.out.print("\n");//move to next line

//Printing lower case Alphabets
System.out.println("Lowercase Alphabets are: \n");
for(ch='a'; ch<='z'; ch++){
System.out.print(ch+" ");
//display lowercase Alphabets with space
}

}

}

When the above code is executed, it produces the following result

In the above program, we are using two for loops, one is used to print upper case letters and another to print lower case letters

Code to print all Alphabets using while loop

The program displays all the upper case and lower case alphabets letters from a to z using while loop in Java language

Program 2

public class Display_Alphabets1{
public static void main(String args[]){
char ch;//char variable declaration
//Printing upper case Alphabets
System.out.println("Uppercase Alphabets are: \n");
ch='A';
while(ch<='Z'){
System.out.print(ch+" ");
//display uppercase Alphabets with space
ch++;
}
System.out.print("\n");//move to next line

//Printing lower case Alphabets
System.out.println("Lowercase Alphabets are: \n");
ch='a';
while(ch<='z'){
System.out.print(ch+" ");
//display lowercase Alphabets with space
ch++;
}

}

}

When the above code is executed, it produces the following result

In the above program, we are using two while loops, one is used for printing upper case letters and another to print lower case letters

Code to print all Alphabets using do-while loop

The program displays all the upper case and lower case alphabets letters from a to z using do-while loop in Java language

Program 3

public class Display_Alphabets1{
public static void main(String args[]){
char ch;//char variable declaration
//Printing upper case Alphabets
System.out.println("Uppercase Alphabets are: \n");
ch='A';
do{
System.out.print(ch+" ");
//display uppercase Alphabets with space
ch++;
}while(ch<='Z');
System.out.print("\n");//move to next line

//Printing lower case Alphabets
System.out.println("Lowercase Alphabets are: \n");
ch='a';
do{
System.out.print(ch+" ");
//display lowercase Alphabets with space
ch++;
}while(ch<='z');

}

}

When the above code is executed, it produces the following result

In the above program, we are using two do-while loops, one is used to print upper case letters and another is used for printing lower case letters

Approach

We will declare a counter variable “ch” of the loops (for loop, while loop and do-while loop) and initialize it by “a“(for print lower case) or “A” (for print upper case);
The program checks the given condition(ch<=”z” (lower case) or ch<=”Z”(Upper case) if the condition is true, alphabets will be printed
if the condition is false – loops will be terminated

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