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Java: Get the portion of a map whose keys range from a given key to another key

Java Collection, TreeMap Exercises: Exercise-22 with Solution

Write a Java program to get the portion of a map whose keys range from a given key to another key.

Sample Solution:-

Java Code:

import java.util.*;
import java.util.Map.Entry;  
public class Example22 {  
           public static void main(String args[]) {

  // Declare tree maps
  TreeMap < Integer, String > tree_map = new TreeMap < Integer, String > ();
  SortedMap < Integer, String > sub_tree_map = new TreeMap < Integer, String > ();

  // Put elements to the map 
  tree_map.put(10, "Red");
  tree_map.put(20, "Green");
  tree_map.put(30, "Black");
  tree_map.put(40, "White");
  tree_map.put(50, "Pink");
  System.out.println("Orginal TreeMap content: " + tree_map);
  sub_tree_map = tree_map.subMap(20, true, 40, true);
  System.out.println("Sub map key-values: " + sub_tree_map);
 }
}

Sample Output:

Orginal TreeMap content: {10=Red, 20=Green, 30=Black, 40=White, 50=Pink
}                                                                      
Sub map key-values: {20=Green, 30=Black, 40=White}

Java Code Editor:

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Java: Tips of the Day

DropElements

Removes elements in an array until the passed function returns true. Returns the remaining elements in the array.

Loop through the array, using Arrays.copyOfRange() to drop the first element of the array until the returned value from the function is true. Returns the remaining elements.

public static int[] dropElements(int[] elements, IntPredicate condition) {
    while (elements.length > 0 && !condition.test(elements[0])) {
        elements = Arrays.copyOfRange(elements, 1, elements.length);
    }
    return elements;
}

Ref: https://bit.ly/37YWqzD

 





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