Java Collection, HashMap Exercises: Get the value of a specified key in a map

Java Collection, HashMap Exercises: Exercise-10 with Solution

Write a Java program to get the value of a specified key in a map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example10 {  
    public static void main(String args[]){  
   HashMap<Integer,String> hash_map= new HashMap<Integer,String>();  
     // get value of key 3
   String val=(String)hash_map.get(3); 
   // check the value
   System.out.println("Value for key 3 is: " + val);

Sample Output:

Value for key 3 is: Black

Java Code Editor:

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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