Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;

public class Main {
    public static void main(String args[]) {

        Map<String, Boolean> map = new WeakHashMap<String, Boolean>();

        // create a set from map
        Set<String> set = Collections.newSetFromMap(map);

        // add values in set
        set.add("Java");
        set.add("C");
        set.add("C++");
        set.add("from java2s.com");

        // set and map values are
        System.out.println("Set is: " + set);
        System.out.println("Map is: " + map);
    }
}