MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.util.Map;
import java.util.TreeMap;

public class MainClass {
    public static void main(String[] a) {

        TreeMap map = new TreeMap();
        map.put("key1", "value1");
        map.put("key2", "value2");
        map.put("key3", "value3");

        Map map2 = map.headMap("key2");
        System.out.println(map2);
    }
}