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24_Map_HashMap.java
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51 lines (40 loc) · 1.2 KB
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import java.util.HashMap;
import java.util.Map;
public class Main {
public static void main(String[] args) {
/* KEY : VALUE
* "red" : "apple"
* "yellow" : "banana"
* "white" : "radish"
* "green" : "apple"
* */
Map<String, String> fruits = new HashMap<>();
fruits.put("red", "apple");
fruits.put("yellow", "banana");
fruits.put("white", "radish");
fruits.put("green", "apple");
// fruits.containsKey("red"); // returns true, if key is found
// fruits.containsValue("apple"); // returns true, if value is found
// fruits.size(); // returns the size of the MAP
// fruits.remove("red"); // Deletes the Entry whose key is "red"
// fruits.clear();
System.out.println(fruits.get("red"));
for (Map.Entry pairEntry: fruits.entrySet()) {
System.out.println(pairEntry.getKey() + " : " + pairEntry.getValue());
}
}
}
/*
* Map: Interface
* HashMap: Class that implements interface Map
*
* class HashMap implements Map {
* ...
* }
*
* Map Properties:
* 1. They contain values based on key
* 2. They are not ordered
* 3. "KEY" should be unique
* 4. "VALUE" can be duplicate
* */