﻿ Java Collection, TreeMap Exercises: Get the least key greater than or equal to the given key - w3resource # Java Collection, TreeMap Exercises: Get the least key greater than or equal to the given key

## Java Collection, TreeMap Exercises: Exercise-26 with Solution

Write a Java program to get the least key greater than or equal to the given key. Returns null if there is no such key.

Sample Solution:-

Java Code:

``````import java.util.*;
import java.util.Map.Entry;
public class Example26 {
public static void main(String args[]) {
// Declare tree maps
TreeMap < Integer, String > tree_map = new TreeMap < Integer, String > ();
// Put elements to the map
tree_map.put(10, "Red");
tree_map.put(20, "Green");
tree_map.put(40, "Black");
tree_map.put(50, "White");
tree_map.put(60, "Pink");
System.out.println("Orginal TreeMap content: " + tree_map);
System.out.println("Keys greater than or equal to 20: " + tree_map.ceilingKey(20));
System.out.println("Keys greater than or equal to 30: " + tree_map.ceilingKey(30));
System.out.println("Keys greater than or equal to 50: " + tree_map.ceilingKey(50));
}
}
``````

Sample Output:

```Orginal TreeMap content: {10=Red, 20=Green, 40=Black, 50=White, 60=Pink
}
Keys greater than or equal to 20: 20
Keys greater than or equal to 30: 40
Keys greater than or equal to 50: 50 ```

Java Code Editor:

What is the difficulty level of this exercise?

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## Java: Tips of the Day

Choice between Float and Double:

Data type Bytes used Significant figures (decimal)
Float 4 7
Double 8 15

Double is often preferred over float in software where precision is important because of the following reasons:
Most processors take nearly the same amount of processing time to perform operations on Float and Double. Double offers far more precision in the same amount of computation time.

Ref: https://bit.ly/3oj7K2K