sort

package demo.sort;

import java.util.ArrayList;
import java.util.Collections;

public class ArrayListDemo1 {

	public static void main(String[] args) {
		ArrayList<User> users = new ArrayList<User>();
		users.add(new User(10, "김유신"));
		users.add(new User(80, "이순신"));
		users.add(new User(40, "유관순"));
		users.add(new User(50, "홍길동"));
		users.add(new User(20, "강감찬"));
		
		Collections.sort(users);
		
		for (User user : users) {
			System.out.println(user.getNo() + ", " + user.getName());
		}
	}
}

package demo.sort;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class ArrayListDemo2 {

	public static void main(String[] args) {
		ArrayList<Fruit> box = new ArrayList<Fruit>();
		box.add(new Fruit("사과", 2000));
		box.add(new Fruit("바나나", 6000));
		box.add(new Fruit("오렌지", 3000));
		box.add(new Fruit("아보카도", 8000));
		box.add(new Fruit("토마토", 4000));
		box.add(new Fruit("감", 9000));
		
		Comparator<Fruit> priceComparator = new Comparator<Fruit>() {
			@Override
			public int compare(Fruit o1, Fruit o2) {
				return o1.getPrice() - o2.getPrice();
			}
		};
		
		Collections.sort(box, priceComparator);
		
		for (Fruit fruit : box) {
			System.out.println(fruit.getName() + " " + fruit.getPrice());
		}
	}
}

package demo.sort;

import java.util.TreeSet;

public class TreeSetDemo {

	public static void main(String[] args) {
		TreeSet<User> users = new TreeSet<User>();
		
		users.add(new User(10, "김유신"));
		users.add(new User(80, "이순신"));
		users.add(new User(40, "유관순"));
		users.add(new User(50, "홍길동"));
		users.add(new User(20, "강감찬"));
		
		for (User user : users) {
			System.out.println(user.getNo() + ", " + user.getName());
		}		
	}
}

package demo.sort;

public class User implements Comparable<User>{

	private int no;
	private String name;
	
	public User() {}
	public User(int no, String name) {
		this.no = no;
		this.name = name;
	}

	public int getNo() {
		return no;
	}
	
	public void setNo(int no) {
		this.no = no;
	}
	
	public String getName() {
		return name;
	}
	
	public void setName(String name) {
		this.name = name;
	}
	
	@Override
	public int compareTo(User o) {
		return name.compareTo(o.name);
	}
    
}

package demo.sort;

public class Fruit {

	private String name;
	private int price;
	
	public Fruit() {}
	public Fruit(String name, int price) {
		this.name = name;
		this.price = price;
	}
	
	public String getName() {
		return name;
	}
	
	public void setName(String name) {
		this.name = name;
	}
	
	public int getPrice() {
		return price;
	}
	
	public void setPrice(int price) {
		this.price = price;
	}
}