package OOP;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.Vector;

public class A {
 private String tenNV;
 private int tuoi;
 Scanner input = new Scanner(System.in);

 public A(String tenNV, int tuoi){
  this.tenNV = tenNV;
  this.tuoi = tuoi;
 }
 
 public A() {
  
 }

 public String getTenNV() {
  return tenNV;
 }
 public void setTenNV(String tenNV) {
  this.tenNV = tenNV;
 }
 public String getTuoi() {
  return tuoi;
 }
 public void setTuoi(String tuoi) {
  this.tuoi = tuoi;
 }
 
 
 public ArrayList<A> input(int number){
  ArrayList<A> alA = new ArrayList<A>();
  for(int i = 0; i < number; i++){
   System.out.println("tenNV:");
   this.tenNV = input.nextLine();
   System.out.println("tuoi:");
   this.tuoi = Integer.parseInt(input.nextLine());
   
   A a = new A(tenNV, tuoi);
   alA.add(a);
  }

  return alA;
 }
        @Override
 public String toString(){
  return "tenNV: " + this.tenNV + " \ntuoi: " + this.tuoi;
 }
 

}





package arraylist;

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

import OOP.A;

public class ArrayListDemo extends A{
 
 public ArrayListDemo(){
  
 }
 
 public static void SortArrayList(ArrayList<A> alA){
  Comparator<A> compalA = new Comparator<A>() {
   
   @Override
   public int compare(A obj1, A obj2) {
    // so sanh  chuoi
    // muon sap xep nguoc lai thi doi lai vi tri cua obj1 va obj2
    return obj1.getTenNV().compareToIgnoreCase(obj2.getTenNV());
    /*
     * Sap xep so
     * if(obj1.getTuoi() - obj1.getTuoi() > 0){
      return 1;
     } else if(obj1.getTuoi() - obj1.getTuoi() < 0){
      return -1;
     } else {
      return 0;
     }
     * 
     * */
    
   }
  };
  Collections.sort(alA, compalA);
 }
 public static void displayData(ArrayList<A> alA){
  for(A a : alA){
   System.out.println(a.toString());
   
  }
 }
 
 public static void main(String[] args) {
  ArrayListDemo alDemo = new ArrayListDemo();
  ArrayList<A> alA = new ArrayList<A>();
  alA = alDemo.input(3);
  SortArrayList(alA);
  displayData(alA);
  
 }
}