package com.dj;

import java.util.Arrays;

import java.util.Comparator;

import java.util.Random;

public class Main {

public static void main(String[] args) {

Integer five = 5;

Integer[] others = {0, 5, 10, -50, 50};

for (Integer i : others){

int val = five.compareTo(i);

System.out.printf("%d %s %d: compareTo=%d %n ", five,(val == 0 ? "==": (val < 0) ? "<":">"),i,val);

}

String banana = "banana";

String[] fruit = {"apple","banana","pear","BANANA"};

for (String s : fruit){

int val = banana.compareTo(s);

System.out.printf("%s %s %s: compareTo=%d%n", banana,(val ==0 ? "==" : (val < 0) ? "<" : ">"),s,val);

}

Arrays.sort(fruit);

System.out.println(Arrays.toString(fruit));

System.out.println("A:" + (int)'A' + " " + "a:" + (int)'a');

System.out.println("B:" + (int)'B' + " " + "b:" + (int)'b');

System.out.println("P:" + (int)'P' + " " + "p:" + (int)'p');

Student tim = new Student("Tim");

Student[] students = {new Student("Zach"),new Student("Tim"), new Student("Ann")};

Arrays.sort(students);

System.out.println(Arrays.toString(students));

System.out.println("result = " + tim.compareTo(new Student("TIM")));

Comparator<Student> gpaSorter =new StudentGPAComparator();

Arrays.sort(students,gpaSorter.reversed());

System.out.println(Arrays.toString(students));

}

}

class StudentGPAComparator implements Comparator<Student>{

@Override

public int compare(Student o1, Student o2){

return (o1.gpa + o1.name).compareTo(o2.gpa + o2.name);

}

}

class Student implements Comparable<Student>{

private static int LAST_ID =1000;

private static Random random = new Random();

String name;

private int id;

protected double gpa;

public Student(String name) {

this.name = name;

id = LAST_ID++;

gpa = random.nextDouble(1.0,4.0);

}

@Override

public String toString() {

return "%d - %s (%.2f)".formatted(id,name,gpa);

}

@Override

public int compareTo(Student o) {

return Integer.valueOf(id).compareTo(Integer.valueOf(o.id));

}

// @Override

// public int compareTo(Object o) {

// Student other = (Student) o;

// return name.compareTo(other.name);

// }

}