If-else Java 8

If-else Java 8

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In Java 8, you can use the if statement to perform a conditional operation based on a specific condition. The syntax for an if statement in Java is as follows:

if (condition) {
// code to execute if condition is true
}

For example, you can check if a number is greater than 5 using the following code:

int num = 7;
if (num > 5) {
System.out.println("The number is greater than 5");
} else {
System.out.println("The number is not greater than 5");
}

In this example, the condition num > 5 will be evaluated to true, so the code inside the if block will be executed. If you were to change the value of num to 4, then the condition would be evaluated as false, and the code in the else block would be executed.

You can also use a more complex condition using logical operators such as && (logical AND) or || (logical OR). For example:

int num1 = 6;
int num2 = 7;
if ((num1 > 5) && (num2 > 5)) {
System.out.println("Both numbers are greater than 5");
} else if ((num1 < 5) || (num2 < 5)) {
System.out.println("At least one number is less than 5");
} else {
System.out.println("Neither condition is met");
}

In this example, the if statement checks if both numbers are greater than 5. If that's not the case, it then checks if at least one of the numbers is less than 5.

You can also use a switch statement in Java to perform different operations based on the value of an expression. The syntax for a switch statement is as follows:

int dayOfWeek = 2;
switch (dayOfWeek) {
case 1:
System.out.println("Today is Monday");
break;
case 2:
System.out.println("Today is Tuesday");
break;
default:
System.out.println("Unknown day of the week");
}

In this example, the switch statement checks the value of dayOfWeek. If it's equal to 1, it prints "Today is Monday". If it's equal to 2, it prints "Today is Tuesday". Any other value will print "Unknown day of the week".

These are just a few examples of how you can use if and switch statements in Java. Let me know if you have any specific questions or if there's anything else I can help with!

How to use if condition in lambda expression in java javatpoint

I'm happy to help! Here's the answer:

The if-else statement is a fundamental concept in programming, and it can be implemented in Java using lambda expressions. In this tutorial, we will explore how to use if-condition in lambda expression in Java.

What are Lambda Expressions?

Before we dive into the world of if-statements in lambda expressions, let's quickly cover what lambda expressions are:

Lambda expressions are anonymous functions that can be used as arguments to methods or as return types for methods. They consist of an arrow (->) followed by a block of code. This code is executed when the lambda expression is invoked.

The syntax for creating a lambda expression is:

(parameters) -> {code}

where parameters are the input parameters for the function and code is the code that will be executed when the lambda expression is called.

Using if-else Statements in Lambda Expressions

Now that we've covered what lambda expressions are, let's explore how to use if-statements with them. If-statements allow you not to execute a certain block of code based on a condition. This can be achieved using the ternary operator:

return (condition) ? true_value : false_value;

This is equivalent to:

if (condition)

return true_value;

else

return false_value;

Let's see how this works in practice with an example.

Example: Filtering Even Numbers

Suppose we want to filter out even numbers from a list of integers. We can use the following lambda expression and if-statement:

List numbers = Arrays.asList(1, 2, 3, 4, 5);

numbers.stream()

.filter(n -> n % 2 == 0) // filter for even numbers

.forEach(System.out::println);

In this example, we're using the stream API to create a stream from the list of numbers. Then, we're using the filter method and a lambda expression to filter out the even numbers.

The lambda expression (n -> n % 2 == 0) checks if each number is divisible by 2 without leaving a remainder. If it is, then that means the number is even.

This will print only the even numbers from the list: 2, 4.

Conclusion

In this tutorial, we've explored how to use if-statements in lambda expressions in Java. We learned about the syntax of lambda expressions and how they can be used with if-statements to filter out certain data based on a condition. This knowledge will help you write more concise and efficient code in your future programming projects.

So, if you want to create more efficient code that uses functional programming concepts, this tutorial is perfect for you!