Test01.java

package testowa;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

public class Test01 {

    public static void main(String[] args) {

        /*
        Map<Integer, String> mapa = new HashMap<>();

        mapa.put(1, "Hello");
        mapa.put(3, "Hello3");
        mapa.put(4, "Hello4");

        for ( Integer key : mapa.keySet() ) {

            System.out.println( key + " " + mapa.get(key) );

        }

        System.out.println( mapa.hashCode() );
        *
        */
        Set<Student> zbior = new TreeSet<>();

        zbior.add(new Student("Kowlaski", 2));
        zbior.add(new Student("Adamski", 5));
        zbior.add(new Student("Bednarski", 7));

        for (Student student : zbior) {
            System.out.println(student);
        }

    }

}