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98 lines (68 loc) · 2.61 KB
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package com.hmkcode;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
import com.hmkcode.vo.Person;
public class MapApp
{
public static void main( String[] args )
{
// ( 1 ) Map
// A. Initiate
Map<String,Person> hashMap = new HashMap<String,Person>();
Map<String,Person> treeMap = new TreeMap<String,Person>();
// B. Populate
int k = 0 ;
for(Person person:getPersons()){
hashMap.put(""+k,person);
treeMap.put(""+k++,person);
}
// --> print
System.out.println("--------- Print All -------------");
System.out.println("HashMap: "+hashMap);
System.out.println("TreeMap: "+treeMap);
// C. Iterate
// --> print
System.out.println("--------- Print Iterate by get(key) -------------");
for(String key:treeMap.keySet()){
System.out.println("treeMap: [key: "+key+" , value: "+treeMap.get(key));
}
// --> print
System.out.println("--------- Print Iterate by Entry -------------");
for(Entry<String, Person> entry:treeMap.entrySet()){
System.out.println("treeMap: [key: "+entry.getKey()+" , value: "+entry.getValue());
}
// D. Sort by value
TreeMap<String,Person> sorted_map = new TreeMap<String,Person>(new ValueComparator());
sorted_map.putAll(hashMap);
// --> print
System.out.println("--------- Print Sorted Map by Value -------------");
System.out.println("Sorted HashMap: "+sorted_map);
// E. Convert Map to List
List<Person> persons = new ArrayList<Person>(sorted_map.values());
// --> print
System.out.println("--------- Print List<Person> -------------");
System.out.println("List<Person>: "+persons);
}
private static Person[] getPersons(){
Person[] persons = new Person[5];
persons[0] = new Person("Brit", 29);
persons[1] = new Person("John", 32);
persons[2] = new Person("Jack", 27);
persons[3] = new Person("Jenifer", 24);
persons[4] = new Person("Brit", 37);
return persons;
}
}
class ValueComparator implements Comparator {
Map map;
public ValueComparator(){
}
public int compare(Object keyA, Object keyB){
return ((String) keyA).compareTo((String) keyB);
}
}