Summary table of Java Modifiers and Access Specifiers.

Summary table of Java Modifiers and Access Specifiers.

• The only applicable modifier for the local variable is final.
• The only applicable modifiers for constructor are public, private, default, protected.
• The modifiers which are applicable only to the method is native.
• The modifiers which are applicable only for variables volatile and transient.
• The modifiers which are applicable for classes but not for an interface is final.
• The modifier which is applicable for classes but not for enum is final, abstract.

//Array of ArrayList Demonstration in java

import java.util.*;

public class ArrayOfArrayList

{

  public static void main(String args[])

  {

    ArrayList listArray[] = new ArrayList[2];

 

    ArrayList firstList = new ArrayList();

    firstList.add("Java");   

    firstList.add("Technology");

 

    ArrayList secondList = new ArrayList();

    secondList.add("Govind");   

    secondList.add("Ballabh");

    secondList.add("Khan");

    listArray[0] = firstList;

    listArray[1] = secondList;

 

    System.out.println(listArray[0]);

    System.out.println(listArray[1]);

  }

}

                                 // Java program to illustrate creating an array of objects

class Student
{
    public int roll_no;
    public String name;
    Student(int roll_no, String name)
    {
        this.roll_no = roll_no;
        this.name = name;
    }
}

// Elements of array are objects of a class Student.
public class StudentDemo
{
    public static void main (String[] args)
    {
        // declares an Array of Student Object.
        Student[] arr;

        // allocating memory for 5 objects of type Student.
        arr = new Student[5];

        // initialize the first elements of the array
        arr[0] = new Student(1,"govind");

        // initialize the second elements of the array
        arr[1] = new Student(2,"ajit");

        // so on...
        arr[2] = new Student(3,"mani");
        arr[3] = new Student(4,"dinesh");
        arr[4] = new Student(5,"sanjay");

        // accessing the elements of the specified array
        for (int i = 0; i < arr.length; i++)
            System.out.println("Element at " + i + " : " +
                        arr[i].roll_no +" "+ arr[i].name);
    }
}

                                                     One Dimensional Array in java

public class OneDimensionalArray
{
  public static void main(String args[])
  {
    int marks[] = new int[5];

  System.out.println("Elements are " + marks.length);           

 // Now assign values
   
    marks[0] = 68;
    marks[1] = 70;
    marks[2] = 76;
    marks[3] = 85;
    marks[4] = 94;

  System.out.println("Value of 1st element: " + marks[0]);
  System.out.println("Value of 2nd element: " + marks[1]);
  System.out.println("Value of 3rd element: " + marks[2]);
  System.out.println("Value of 4th element: " + marks[3]);
  System.out.println("Value of 5th element: " + marks[4]);           

    System.out.println("Printing through  for  loop ");
    for(int i = 0; i < marks.length; i++)
    {
       System.out.println(marks[i] ); 
    }

    System.out.println("Printing through for each loop");
    for(int k : marks)
    {
        System.out.println(k);
    }   
  }
}

                                                                 //String array in java
public class Demo
{
public static void main(String args[ ])
{
String fname = "Govind";
String mname = "Ballabh";
String lname = "Khan";

System.out.println("========================Names===============================");
String names[] = {fname, mname, lname};
for(int i = 0; i < names.length; i++)
{
System.out.println(names[i]);
}

System.out.println("========================Cities===============================");
// we can create like this also
String cities[ ] = {"patna", "Bhopal", "Delhi"};
for(int i = 0; i < cities.length; i++)
{
System.out.println(cities[i]);
}

System.out.println("========================Language===============================");
// we can do like this also
String languages[ ] = new String[6];
languages[0] = "C";
languages[1] = "C++";
languages[2] = "Java";
languages[4] = ".Net";
languages[5] = ".Php";
for(int i = 0; i <languages.length; i++)
{
System.out.println(languages[i]);
}
}
}