Complete List of All Control Statements in Java Programming

In Java programming, control statements are important tools that control how a program runs. They let developers make decisions, repeat actions, and manage the flow of code based on certain conditions. By using control statements, programmers can create flexible and efficient applications that can adapt to different situations and user inputs. So, this article is here to give a simple overview of the control statements in Java. Including selection, iteration, and jump statements, with examples of how to use them. Whether you are new to programming or have experience. In fact, learning these control structures is key to writing effective and adaptable Java programs.

What are Control Statements in Java?

Control statements in Java are tools that help control the flow of a program based on certain conditions. They let developers decide which parts of the code should run and when making programs more flexible and adaptable. These control statements are key to writing clear and effective Java programs that can handle different situations.

Selection Statements in Java

Selection statements are used to make decisions within a program. They allow the program to choose different paths of execution based on the evaluation of certain conditions.

1. if Statement

The if statement is one of the most basic control structures in Java. It evaluates a boolean expression and executes the block of code inside the if statement if the expression is true.

? int num = 10;

???if (num > 5) {

???????System.out.println("Number is greater than 5");

???}

2. if-else Statement

The if-else control statements in Java provide an alternative path of execution when the if condition is false.

? int num = 3;

???if (num > 5) {

???????System.out.println("Number is greater than 5");

???} else {

???????System.out.println("Number is not greater than 5");

???}

3. else-if Ladder

The else-if ladder is used when there are multiple conditions to check. These control flow statements in Java allow the program to test multiple conditions and execute different blocks of code accordingly.

? int num = 7;

???if (num > 10) {

???????System.out.println("Number is greater than 10");

???} else if (num > 5) {

???????System.out.println("Number is greater than 5 but less than or equal to 10");

???} else {

???????System.out.println("Number is 5 or less");

???}

4. switch Statement

The switch statement is an alternative to the else-if ladder. It compares a variable with multiple values (cases) and executes the block of code corresponding to the matching case.

? int day = 2;

???switch (day) {

???????case 1:

???????????System.out.println("Monday");

???????????break;

???????case 2:

???????????System.out.println("Tuesday");

???????????break;

???????case 3:

???????????System.out.println("Wednesday");

???????????break;

???????default:

???????????System.out.println("Invalid day");

???}

Iteration Control Statements in Java

Iteration statements, also known as looping statements, allow a block of code to be executed repeatedly based on a condition.

1. for loop

The for loop is a control structure in Java that allows code to be executed repeatedly. It is commonly used when the number of iterations is known beforehand.

? for (int i = 0; i < 5; i++) {

???????System.out.println("Iteration " + i);

???}

2. while Loop

The while loop continues to execute the code inside its block as long as the specified condition remains true. It is useful when the number of iterations is not known in advance.

? int i = 0;

???while (i < 5) {

???????System.out.println("Iteration " + i);

???????i++;

???}

3. do-while Loop

The do-while loop is similar to the while loop, except that it guarantees that the code inside the loop is executed at least once, regardless of whether the condition is true.

? int i = 0;

???do {

???????System.out.println("Iteration " + i);

???????i++;

???} while (i < 5);

Jump Control Statements in Java

Jump Java control statements are used to transfer control to another part of the program. These statements allow for breaking out of loops or skipping iterations.

1. break Statement

The break statement is used to exit from a loop or a switch statement prematurely.

? for (int i = 0; i < 10; i++) {

???????if (i == 5) {

???????????break;

???????}

???????System.out.println("Iteration " + i);

???}

2. continue Statement

The continue control statement in Java skips the current iteration of a loop and proceeds to the next iteration.

? for (int i = 0; i < 10; i++) {

???????if (i == 5) {

???????????continue;

???????}

???????System.out.println("Iteration " + i);

???}

3. return Statement

The return statement is used to exit from a method and optionally return a value to the calling method.

? public int add(int a, int b) {

???????return a + b;

???}

Remember to understand how important the break, continue, and return control statements are in Java when you are developing software. A Java full stack certification course will be beneficial. Knowing these control statements in Java is crucial for anyone looking to start a career in software development.

Control Statements Program in Java

Let’s bring all the control structures together in a simple Java program that calculates the factorial of a given number using both selection and iteration control statements.

import java.util.Scanner;

public class FactorialCalculator {

???public static void main(String[] args) {

???????Scanner scanner = new Scanner(System.in);

???????System.out.print("Enter a number: ");

???????int num = scanner.nextInt();

???????if (num < 0) {

???????????System.out.println("Factorial is not defined for negative numbers.");

???????} else {

???????????int factorial = 1;

???????????for (int i = 1; i <= num; i++) {

???????????????factorial *= i;

???????????}

???????????System.out.println("Factorial of " + num + " is " + factorial);

???????}

???}

}

Conclusion

In conclusion,? control statements in Java are tools that help decide how a program runs based on certain conditions. They are essential for writing code that is both efficient and flexible. By using selection, iteration, and jump statements, developers can build applications that adapt to different situations and user inputs. Learning these control structures is important for everyone, from beginners to experts, as they are at the heart of decision-making in Java. Whether it is choosing different paths for the code to follow, or repeating actions. As well as for managing loops, knowing how to use control statements leads to strong and adaptable Java programs. With these tools, developers can create software that works well and is easy to update and maintain.