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package Collection;

import java.util.*;

public class HashSetDemo {

    public static void main(String args[]){

        Set<String> set = new HashSet<>();

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package Collection;

import java.util.*;

public class HashSetDemo2 {

    public static void main(String args[]){

        Set<String> set1 = new HashSet<>();

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package Collection;

import java.util.*;
public class LinkedHashSetDemo {

    public static void main(String args[]){

        Set<String> set = new LinkedHashSet<>();

        set.add("London");

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public class Person {

    String isim;
    int yas;

    public Person(String isim, int yas){
        this.isim = isim;
        this.yas = yas;
    }
}

MericBERBER

import java.util.Comparator;

public class PersonComparator implements Comparator<Person> {
    @Override
    public int compare(Person o1, Person o2) {
        return o1.yas > o2.yas ? 1 : -1;
    }
}

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public class TestComparator {

    public static void main(String args[]){

        Person p1 = new Person("Meric",25);
        Person p2 = new Person("Ali",15);

        Person older = older(p1,p2, new PersonComparator());

        System.out.println("Yasi buyuk olan person :" + older.isim); // Meric

MericBERBER

import java.util.*;
 
public class TestArrayAndLinkedList {
    public static void main(String[] args) {
        List<Integer> arrayList = new ArrayList<>();
        arrayList.add(1);
        arrayList.add(2);
        arrayList.add(3);
        arrayList.add(1);
        arrayList.add(4);

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import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;
 
import static java.nio.file.FileVisitOption.*;
import java.util.*;
 
 
public class Find {
 

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import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import static java.nio.file.FileVisitResult.*;
 
 
public  class PathDemo extends SimpleFileVisitor <Path>
{
    @Override
    public FileVisitResult visitFile(Path file,

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class PassByReference {
    private  String value = "First Value";

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }