Java Perfect Program

How to create multiple copies of a given object

package com.java2novice.collections;

import java.util.Collections;

import java.util.List;

public class MyObjectNCopies

{

public static void main(String a[])

{

        String temp = "Java2novice";

        List tempCopies = Collections.nCopies(5, temp);

        System.out.println(tempCopies);

        Empy emp = new Empy(10, "Raghu", 25000);

        List empCopies = Collections.nCopies(5, emp);

        for(Empy e:empCopies)

       {

            System.out.println(e);

        }

    }

}

class Empy

{

    private int id;

    private String name;

    private Integer salary;

  public Empy(int id, String name, Integer sal)

 {

        this.id = id;

        this.name = name;

        this.salary = sal;

  }

  public int getId()

  {

        return id;

   }

  public void setId(int id)

  {

        this.id = id;

    }

  public String getName()

  {

        return name;

    }

   public void setName(String name)

   {

        this.name = name;

    }

    public Integer getSalary()

    {

        return salary;

    }

    public void setSalary(Integer salary)

    {

        this.salary = salary;

    }

    public String toString()

   {

        return id+"  "+name+"   "+salary;

    }

}

How to replace all occurances of a given object in the list

package com.java2novice.collections;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class MyListReplaceAll

{

public static void main(String a[])

{

        List list = new ArrayList();

        list.add("java");

        list.add("c");

        list.add("c++");

        list.add("unix");

        list.add("perl");

        list.add("php");

        list.add("javascript");

        list.add("ruby");

        list.add(".net");

        list.add("perl");

        list.add("c++");

        System.out.println(list);

        Collections.replaceAll(list, "perl", "dum_dum");

        System.out.println(list);

    }

}

How to rotate elements in the list by specified distance

package com.java2novice.collections;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class MyListRotate

{

public static void main(String a[])

{

        List list = new ArrayList();

        list.add("java");

        list.add("c");

        list.add("c++");

        list.add("unix");

        list.add("perl");

        list.add("php");

        list.add("javascript");

        list.add("ruby");

        list.add(".net");

        System.out.println(list);

        Collections.rotate(list, 3);

        System.out.println("List after rotation:");

        System.out.println(list);

    }

}