hashmap of hashmap in java code example
Example 1: java hashmap syntax
// Import the HashMap class
import java.util.HashMap;
// First Example
// Create a HashMap object called capitalCities
HashMap capitalCities = new HashMap();
// Add keys and values (Country, City)
capitalCities.put("England", "London");
capitalCities.put("Germany", "Berlin");
capitalCities.put("Norway", "Oslo");
capitalCities.put("USA", "Washington DC");
System.out.println(capitalCities);
//Second Example
// Create a HashMap object called stGrade
Map stGrade = new HashMap();
// Insert elements
stGrade.put("aaron", new Integer(90));
stGrade.put("isaac", new Integer(100));
stGrade.put("john", new Integer(35));
stGrade.put("mohammad", new Integer(100));
// Get value
stGrade.get("mohammad"); // returns 100
stGrade.get("aaron"); // returns 90
stGrade.get("john"); // returns 35
stGrade.get("isaac"); // returns 100
Example 2: hashmaps java
import java.util.HashMap;
//Within a class
//You can do new HashMap();, but you don't need to
HashMap examplehashmap=new HashMap<>();
{
//put in values
examplehashmap.put(5, "example");
};
//get value
examplehashmap.get(5);
//returns "example"
Example 3: java hashmap example
//Hash map creation
Map< String,Integer> hm =
new HashMap< String,Integer>();
//inserting elements into hashmap
hm.put("a", new Integer(100));
hm.put("b", new Integer(200));
hm.put("c", new Integer(300));
hm.put("d", new Integer(400));
Example 4: HashMap> hashMap = new HashMap<>();
HashMap> hashMap = new HashMap<>();