Question

How to create and use Consumer Interface for a lambda expression in Java

Answer 1

package javaapplication1;

import java.util.function.Consumer;

public class JavaApplication1 {

    static void display(int n) {

        switch (n) {
            case 1:
                System.out.println("n = 1");
                return;
            case 2:
                System.out.println("n = 2");
                return;
            default:
                System.out.println("default n = " + Integer.toString(n));
        }
    }

    public static void main(String[] args) {

        try {

            Consumer<Integer> consumer = n -> display(n);

            consumer.accept(0);
            consumer.accept(1);
            consumer.accept(2);
            consumer.accept(3);

        } catch (Exception e) {
            System.out.println(e.toString());
        }
    }
}

/*
               
run:
  
default n = 0
n = 1
n = 2
default n = 3
      
 */

 

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