Java: Associate the specified value with the specified key in a HashMap
Write a Java program to associate the specified value with the specified key in a HashMap.
Sample Solution:
Java Code:
import java.util.*;
public class Example1 {
public static void main(String args[]) {
HashMap<Integer,String> hash_map= new HashMap<Integer,String>();
hash_map.put(1, "Red");
hash_map.put(2, "Green");
hash_map.put(3, "Black");
hash_map.put(4, "White");
hash_map.put(5, "Blue");
for(Map.Entry x:hash_map.entrySet()){
System.out.println(x.getKey()+" "+x.getValue());
}
}
}
Sample Output:
1 Red 2 Green 3 Black 4 White 5 Blue
For more Practice: Solve these Related Problems:
- Write a Java program to insert a key-value pair into a HashMap and then update the value if the key already exists.
- Write a Java program to merge two HashMaps such that if keys collide, the values are concatenated into a single string.
- Write a Java program to create a HashMap, add key-value pairs, and then remove a key only if it is mapped to a specific value.
- Write a Java program to implement a method that adds a key-value pair to a HashMap and returns the previous value associated with the key.
Java Code Editor:
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