Simple Encapsulation example in java

class test
{
  String Name=null;
  int age;
  String occupation=null;
  public void set(String name,int age1,String occ)
  {
      Name=name;
      age=age1;
      occupation=occ;
  }
  public void get()
  {
   
      System.out.println("-------YOUR PERSONAL INFORMATION------");
      System.out.println("NAME :"+Name);
      System.out.println("AGE :"+age);
      System.out.println("OCCUPATION :"+occupation);
     
  }

}
public class EncapsulationExample extends test{
    public static void main(String Dx[])
    {
        test t1=new test();
        t1.set("Dx Panchal",23,"TRAINEE");
        t1.get();
       
    }

}

How to create abstract class in java

abstract class NewCars{
    String CarsName=null;
    public void display(String CN)
    {
        this.CarsName=CN;
        System.out.println("CarName :"+CarsName);
    }
   
}
public class AbstractionExample extends NewCars{

    public static void main(String Dx[])
    {
        AbstractionExample absEx=new AbstractionExample();
       
        absEx.display("New i30");
       
    }
}

How to use TreeSet in java

import java.util.ArrayList;
import java.util.Iterator;
import java.util.TreeSet;


public class TreeSetExample {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        TreeSet<String> name=new TreeSet<>();
        name.add("Dx");
        name.add("Ravi");
        name.add("mitul");
        name.add("Dhaval");
        name.add("Bittu");
       
        Iterator<String> it=name.iterator();
        while(it.hasNext())
        {
            System.out.println(it.next());
        }
    }

}

How to use simple String array in java

import java.util.*;
public class SimpleArray {

    public static void main(String[] Dx) {
        // TODO Auto-generated method stub
       
        String[] name = new String[5];
        name[0]="Dx ";
        name[1]="RAvi ";
        name[2]="Mitul";
        name[3]="Brijesh";
        name[4]="Dhaval";
       
       
        for(int i=0;i<5;i++)
        {
        System.out.println(" "+name[i]);

        }
    }
}

How to use Hashset in java

public class HashsetExample {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        HashSet<String> name=new HashSet<String>();
        name.add("Dx");
        name.add("Ravi");
        name.add("mitul");
        name.add("Dhaval");
        name.add("Bittu");
       
        Iterator<String> it=name.iterator();
        while(it.hasNext())
        {
            System.out.println(it.next());
        }
    }

}

How to use Hashmap in java

import java.util.HashMap;
import java.util.Map;


public class HashmapExample {

    public static void main(String[] args) {

      HashMap<Integer, String> name=new HashMap<Integer, String>();
      name.put(1001,"Dx");
      name.put(1002,"Ravi");
      name.put(1003,"Mitul");
      name.put(1004,"Bittu");
      name.put(1005,"Dhaval");
     
      for(Map.Entry m:name.entrySet())
      {
          System.out.println(m.getKey()+"  "+m.getValue());
         
      }
    
    }

}

how to How to use ArrayList in java

import java.util.ArrayList;


public class ArrayListExample {

    public static void main(String[] args) {
   
        ArrayList<String> name=new ArrayList<String>();
        name.add("Dx");
        name.add("Ravi");
        name.add("mitul");
        name.add("Dhaval");
        name.add("Bittu");
               
      
            System.out.println(name);        
      
     
    }

}