JAVA interview Basic questions and answers for freshers

1)What is OOPs? 
Ans: Object oriented programming organizes a program around its data,i.e.,objects and a set of well defined interfaces to that data.An object-oriented program can be characterized as data controlling access to code.

2)what is the difference between Procedural and OOPs?
Ans: a) In procedural program, programming logic follows certain procedures and the instructions are executed one after another. In OOPs program, unit of program is object, which is nothing but combination of data and code.

b) In procedural program,data is exposed to the whole program whereas in OOPs program,it is accessible with in the object and which in turn assures the security of the code.

Java Program for intializing and printing a Two-dimensional array

public class Twoarray
{
    public static void main(String args[])
    {
        int a[][]={{5,2},{1,4},{2,3}};
    System.out.println("given Two-dimensional array is: ");
        for(int i=0;i<3;i++)
        {
            for(int j=0;j<2;j++)
            {
                System.out.print(a[i][j]);
            }
        System.out.print(" ");
        }
    }
}

Java Program for printing the Fibonacci Series

class Fibonacci
{
 public static void main(String[] args)
 {
 int a=0,b=1,s=0;      
 System.out.println("Fibonacci series printing 10times:"); System.out.println(a);
 System.out.println(b);
 int i=0;
 while(i<10)
     {
            s=a+b;
            a=b;
            b=s;
            System.out.println(s);
            i++;
            }
    }
}

JAVA Program for Bubblesort (Ascending order) of a Single Dimensional Array

class Bubblesort
{
            public static void main(String[] args)
    {
        int a[]={4,1,8,3,5};
        int temp=0;
        System.out.println("given array: ");
        for(int j=0;j<5;j++)
        {
                System.out.print(a[j]);
        }
        System.out.println("");
        System.out.println("Bubble sort for ascending order");
        for(int j=0;<(a.length-1);j++)
        {
            for(int i=0;<(a.length-1);i++)
            {
                if(a[i]>a[i+1])
                {
                    temp=a[i];
                    a[i]=a[i+1];
                    a[i+1]=temp;
                }
               
            }
        }
            System.out.println("the sorted array is:");
            for(int k=0;k<5;k++)
        {
                System.out.print(a[k]);
        }
    }
}

JAVA Program to Print the season of a given month

public class Season
{
public static void main(String[] args)
{
int month=4;
switch(month)
{
case 1:
case 2:
case 3:
System.out.println("Automn");
break;
case 4:
case 5:
case 6:
System.out.println("summer");
break;

case 7:
case 8:
case 9:
System.out.println("winter");
break;
case 10:
case 11:
case 12:
System.out.println("spring");
break;
default:
System.out.println("Wrong input");

}
}
}

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JAVA Program to to find whether the given number is Armstrong or not

class Armstrong
{
public static void main(String[] args)
{
int n=143,temp,a=0,i=1;
temp=n;
while(i>0)
{
i=n%10;
a=(i*i*i)+a;
n=n/10;
}
if(a==temp)
System.out.println("the given number is armstrong");
else
System.out.println("the given number is not armstrong");
}
}

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JAVA Program to Print he Default Values

class Defaultvalues
{
static int a;
static byte b;
static char c;
static short s;
static long l;
static float f;
static double d;
static boolean bl;
public static void main(String[] args)
{
 System.out.println("Default values of various data types");
  System.out.println("int: "+a);
System.out.println("byte: "+b);
System.out.println("char: "+c);
System.out.println("short: "+s);
System.out.println("long: "+l);
System.out.println("float: "+f);
System.out.println("double: "+d);
System.out.println("boolean: "+bl);
}
}

Download this program Here