从树形图中获取排序子图的Java程序

TreeMap<Integer, String> tree_map= new TreeMap<Integer, String>();


tree_map.submap(starting_key, ending_key);


tree_map.submap(starting_key, true, ending_key, true);


tree_map.submap(starting_key, false, ending_key, true);


// Java Program to  Get Sorted Sub-Map from TreeMap
// Importing all classes of
// java.util package
import java.util.*;
public class GFG {
    // Main driver code
    public static void main(String[] args)
    {
        // Create a TreeMap
        TreeMap<Integer, String> my_map
            = new TreeMap<Integer, String>();
        // Adding Element to TreeMap
        my_map.put(5, "DoubleAlpha");
        my_map.put(1, "Alpha");
        my_map.put(3, "Beta");
        my_map.put(2, "Gamma");
        my_map.put(4, "Theta");
        // Printing default sorted elements in given range
        // using subMap function
        System.out.println(
            "Elements:  "
            + my_map.subMap(1, true, 5, true));
    }
}


// Java Program to  Get Sorted Sub-Map from TreeMap
// using predefined functions
// Importing all classes of
// java.util package
import java.util.*;
public class GFG {
    // Main driver code
    public static void main(String[] args)
    {
        // Create a TreeMap
        TreeMap<Integer, String> my_map
            = new TreeMap<Integer, String>();
        // Adding elements to TreeMap
        my_map.put(5, "DoubleAlpha");
        my_map.put(1, "Alpha");
        my_map.put(3, "Beta");
        my_map.put(2, "Gamma");
        my_map.put(4, "Theta");
        // Reversing elements of map in
        // descending order
        Map<Integer, String> reversed_map
            = my_map.descendingMap();
        // Printing default reverse sorted elements
        // using subMap() function
        System.out.println("Elements:  " + reversed_map);
    }
}


Elements: {5=DoubleAlpha, 4=Theta, 3=Beta, 2=Gamma, 1=Alpha}