/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    private static final HashMap<String, String> map = new HashMap<>(2, 0.8f);
 
    public static void main(String[] args) throws Exception {
    	map.put("one", "one");
        map.put("two", "two");
        map.put("three", "three");
        map.put("four", "four");
        map.put("five", "five");
        map.put("six", "six");
        print();
        map.put("seven", "seven");
        map.remove("seven");
        print();
    }
 
    private static void print() {
        map.forEach((id, name) -> System.out.println(id + ": " + name));
        System.out.println();
    }
}

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