In this example, we will show you how to write multiple statements using Java 8 lambda expression.

Java Lambda Expressions Multiple Statements

In the below example, we have demonstrated both like with and without using lambda expression:

interface IAvarage{  
    double avg(int[] array);  
}  
public class JLEExampleMultipleStatements {

    public static void main(String[] args) {
  
        // without lambda expression, IAvarage implementation using anonymous class  
         IAvarage avarage = new IAvarage() {
            @Override
            public double avg(int[] array) {
                double sum = 0;
                int arraySize = array.length;
    
                System.out.println("arraySize : " + arraySize);
                for (int i = 0; i < array.length; i++) {
                    sum = sum + array[i]; 
                } 
                System.out.println("sum : " + sum);
    
                return (sum/ arraySize);
           }
        };
        int[] array = {1,4,6,8,9};
        System.out.println(avarage.avg(array));
  
        // with a lambda expression
        // You can pass multiple statements in lambda expression 
  
        IAvarage withLambda = (withLambdaArray) -> {
            double sum = 0;
            int arraySize = withLambdaArray.length;
   
            System.out.println("arraySize : " + arraySize);
            for (int i = 0; i < withLambdaArray.length; i++) {
                sum = sum + withLambdaArray[i]; 
            }
            System.out.println("sum : " + sum);
   
            return (sum/ arraySize);
       };
  
        int[] withLambdaArray = {1,4,6,8,9};
        System.out.println(withLambda.avg(withLambdaArray)); 
    }
}

Output:

arraySize : 5
sum : 28.0
5.6
arraySize : 5
sum : 28.0
5.6