Introduce the difference between java and c# lambda expression.

UnderStanding of Lambda in Java and C#

In Java and C#, if you want to use lambda expression, then the object must first be a unnamed delegate. So in essence, lambda is a anonymous delegate. As we all know that delegate is a function pointer, although there is no delegate in Java, but we can use it like this:

C#

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class Program
{
    public delegate void delType(string s);
    
    static void Main(string[] args)
    {
        //Console.WriteLine("Hello World!");
        delType d = s => Console.WriteLine("Hello " + s);
        //d("world!");
        d.Invoke("world!");
    }
}

Java

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public class Main {

    public static void main(String[] args) {
	    // write your code here
        IDelType d = s -> System.out.println("Hello " + s);
        d.test("world!");
    }
}

interface IDelType{
    //Interface with only one member method.
    public void test(String s);
}

Delegate In Java And C#

UnderStanding of Lambda in Java and C#

C#

Java