hello/java/samples/collections/CollectionExample.java

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package collectionexample;

import java.io.File;
import java.io.FileReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

/**
 *
 * @author denis
 */
public class CollectionExample {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        //collectionInteger();
        
        collectionPerson();
    }
    
    public static void collectionPerson(){
        System.out.println("-----------------ArrayList------------------");
        List<Person> intArray = new ArrayList<>();
        intArray.add(new Person("Boby", 11));
        intArray.add(new Person("Andrey", 4));
        intArray.add(new Person("Boby", 1));
        intArray.add(new Person("Boby", 10));
        intArray.add(new Person("Boby", 5));
        intArray.forEach(System.out::println);
        
        System.out.println("-----------------LinkedList------------------");
        List<Person> intLink = new LinkedList<>(intArray);
        intLink.forEach(System.out::println);
        
        System.out.println("-----------------HashSet------------------");
        Set<Person> intHashSet = new HashSet<>(intArray);
        intHashSet.forEach(System.out::println);
        
        System.out.println("-----------------TreeSet------------------");
//        Set<Person> intTreeSet = new TreeSet<>(new Comparator<Person>() {
//            @Override
//            public int compare(Person o1, Person o2) {
//                int res = o2.name.compareTo(o1.name);
//                if(res==0) res = o2.phone.compareTo(o1.phone);
//                return res;
//            }
//        });
        Set<Person> intTreeSet = new TreeSet<>((o1, o2) -> {
                int res = o2.name.compareTo(o1.name);
                if(res==0) res = o2.phone.compareTo(o1.phone);
                return res;
        });
        //Set<Person> intTreeSet = new TreeSet<>((o1, o2) -> o2.name.compareTo(o1.name));
        intTreeSet.addAll(intLink);
        intTreeSet.forEach(System.out::println);
        
        System.out.println("-----------------HashMap------------------");
        Map<Integer, Person> maps = new HashMap<>();
        maps.put(intArray.get(0).phone, intArray.get(0));
        maps.put(intArray.get(1).phone, intArray.get(1));
        maps.put(intArray.get(2).phone, intArray.get(2));
        maps.put(intArray.get(3).phone, intArray.get(3));
        maps.put(intArray.get(4).phone, intArray.get(4));
        maps.forEach((e1, e2) -> {System.out.println(e1 + ": " + e2);});
       
    }
    
    public static void collectionInteger(){
        System.out.println("-----------------ArrayList------------------");
        List<Integer> intArray = new ArrayList<>();
        intArray.add(50);
        intArray.add(26);
        intArray.add(26);
        intArray.add(50);
        intArray.add(50);
        intArray.forEach(System.out::println);
        
        System.out.println("-----------------LinkedList------------------");
        List<Integer> intLink = new LinkedList<>(intArray);
        intLink.forEach(System.out::println);
        
        System.out.println("-----------------HashSet------------------");
        Set<Integer> intHashSet = new HashSet<>(intArray);
        intHashSet.forEach(System.out::println);
        
        System.out.println("-----------------TreeSet------------------");
        Set<Integer> intTreeSet = new TreeSet<>(intArray);
        intTreeSet.forEach(System.out::println);
        
        System.out.println("-----------------HashMap------------------");
        Map<String, Integer> maps = new HashMap<>();
        maps.put("One", intArray.get(0));
        maps.put("Two", intArray.get(1));
        maps.put("Three", intArray.get(2));
        maps.put("Four", intArray.get(3));
        maps.put("Five", intArray.get(4));
        maps.forEach((e1, e2) -> {System.out.println(e1 + ": " + e2);});
        
        System.out.println("-----------------LinkedHashMap------------------");
        Map<String, Integer> mapsLink = new LinkedHashMap<>();
        mapsLink.put("One", intArray.get(0));
        mapsLink.put("Two", intArray.get(1));
        mapsLink.put("Three", intArray.get(2));
        mapsLink.put("Four", intArray.get(3));
        mapsLink.put("Five", intArray.get(4));
        mapsLink.forEach((e1, e2) -> {System.out.println(e1 + ": " + e2);});
    }
    
}