Immutable.java

/* Immutable Class */
public final class Box {

	private final String key;
	private final String value;
	private final HashMap<String, String> hm;
	
	
	public Box(String key, String value, HashMap<String, String> hm) {
		this.key = key;
		this.value = value;
		
		HashMap<String, String> hmTest = new HashMap<>();
		
		for (Map.Entry<String, String> hmEntry : hm.entrySet()){
			htTest.put(hmEntry.getKey(), hmEntry.getValue());
		}
		this.hm = hmTest;
	}
	
	//No setters
	
	
	public String getKey() {
		return key;
	}
	
	public String getValue() {
		return value;
	}
	
	public HashMap<String, String> getHm() {
		return (HashMap<String, String>)hm.clone();
	}
}