MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.util.Collections;

public class MainClass {
    public static void main(String[] a) {
        System.out.println(Collections.singletonList("a"));
        System.out.println(Collections.singleton("a"));
        System.out.println(Collections.singletonMap("a", "b"));

    }
}