Controlling program flow is crucial in any programming language, and Java is no exception. In this article, we'll dive deep into conditional statements in Java, such as if, else, and switch, to help you direct your program's flow with ease.
In Java, an
if statement is used to conditionally execute code based on a given condition. When the condition is true, the block of code within the
if statement is executed. If the condition is false, the code is skipped. Let's take a look at a simple example:
In the example above, we have an integer variable
age with a value of 18. The
if statement checks if the age is greater than or equal to 18. Since the condition is true, the code within the
if block is executed, and "You are eligible to vote!" is printed.
Sometimes, you may want to execute some code when the
if condition is false. That's when
else comes into play. The
else statement follows an
if statement and is executed when the
if condition is false. Let's take a look at the voting example again, but this time with an
In this example, the age is set to 16, which makes the condition in the
if statement false. As a result, the code within the
else block is executed, and "Sorry, you are not eligible to vote yet." is printed.
Else If Statements
What if you have multiple conditions to check? That's where the
else if statement comes in handy. An
else if statement follows an
if statement and allows you to check for additional conditions. If the previous conditions are false, the
else if condition is checked. You can chain multiple
else if statements together to check for various conditions. Let's look at an example that demonstrates this:
In this example, we check the student's grade based on their marks. The program first checks if the marks are greater than or equal to 90. If this is false, it moves on to the next
else if statement to check if the marks are greater than or equal to 80, and so on. The output for the given
marks value (85) would be "Grade: B".
switch statement is another way of controlling program flow in Java. It allows you to execute different code blocks based on the value of a variable or expression. The
switch statement is particularly useful when you have a limited set of values to compare, as it can make your code more readable and concise. Here's an example that demonstrates the use of a
This example prints the day of the week based on the integer value of
switch statement compares the value of
dayOfWeek to each
case. When a match is found, the code within that
case is executed, followed by a
break statement to exit the
switch. If no match is found, the code within the
default block is executed.
Now that you have a solid understanding of conditional statements in Java, you can confidently control your program's flow and create more dynamic and responsive applications. Happy coding!