Question1] JAVA Practical Exam Question Bank

( Any One from following will come as Question No. 1)

1) Write Java methods to find the smallest and largest number from array.

import java.util.Scanner;
class minmax
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
int min=100,max=0;
int []a=new int [8];
System.out.println("Enter range of array.... ");
int n =sc.nextInt();
System.out.println("Array is.... ");
for(int i=0;i<n;i++)
{
a[i]=sc.nextInt();
}
for(int i=0;i<n;i++)
{
if(max<a[i])
max=a[i];
}
System.out.println("Largest value is... "+max);
for(int i=0;i<n;i++)
{
if(min>a[i])
min=a[i];
}
System.out.println("Smallest value is... "+min);
}
}

2) Write Java methods for the following

i) accept (takes number n as input parameter) n-by-n matrix.
ii) Display()-which displays matrix.
iii) Add() –which takes two matrices as parameter and performs addition of
matrices.
import java.util.Scanner;
class matrix
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
int r1,r2,c1,c2,i,j;
System.out.println("Enter number of row1...");
r1=sc.nextInt();
System.out.println("Enter number of col1...");
c1=sc.nextInt();
System.out.println("Enter number of row2...");
r2=sc.nextInt();
System.out.println("Enter number of col 2...");
c2=sc.nextInt();
int m1[][]=new int [r1] [c1];
int m2[][]=new int [r2] [c2];
int m3[][]=new int [r1] [c1];
System.out.println("Enter first Matrix....");
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
{
m1[i][j]=sc.nextInt();
}
System.out.print("");
}
System.out.println(" First Matrix....");
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
{
System.out.print(m1[i][j]+" ");
}
System.out.println("");
}
System.out.println("Enter Second Matrix....");
for(i=0;i<r2;i++)
{
for(j=0;j<c2;j++)
{
m2[i][j]=sc.nextInt();
}
System.out.print("");
}
System.out.println("Second Matrix....");
for(i=0;i<r2;i++)
{
for(j=0;j<c2;j++)
{
System.out.print(m2[i][j]+" ");
}
System.out.println("");
}
System.out.println("Addition");
for(i=0;i<r1;i++)
{
for(j=0;j<c1;j++)
{
m3[i][j]=m1[i][j]+m2[i][j];
System.out.print(m3[i][j]+" ");
}
System.out.println("");
}
}
}

3) Write a Java program to find the index of an array element.

class pqr
{
public static int search(int[] a,int n)
{
for(i=0;i<a.length;i++)
{
if(a[i]==n)
return i;
}
return -1;
}
public static void main(string []args)
{
int[]a={25,14,56,15,36,56,77,18,29,49};
system.out.println("Index position of is: "+ search(a,25));
system.out.println("Index position of is: "+search(a,77));
}
}

4) Write a Java Program to find whether a number is prime/Armstrong or not.

import java.util.Scanner;
class abc
{
public static void main(String[] args)
 {
Scanner sc=new Scanner(System.in);
int c=0,a,temp;
int n=sc.nextInt();
temp=n;
while(n>0)
{
a=n%10;
n=n/10;
c=c+(a*a*a);
}
if(temp==c)
System.out.println("Armstrong....");
else
System.out.println("Not....");
}

}
import java.util.Scanner;
class bike
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
int n= sc.nextInt();
boolean flag = false;
for (int i = 2; i <= n / 2; i++)
{
if (n % i == 0)
{
flag = true;
break;
}
}
if (!flag)
System.out.println(n+ " is a prime number.");
else
System.out.println(n + " is not a prime number.");
}
}

OR

import java.util.Scanner;
class bike
{
Scanner sc=new Scanner(System.in);
public static void main(String[] args)
{
bike b=new bike();
b.primenumber();
b.amstrong();
}
void primenumber()
{
int n=sc.nextInt();
boolean flag = false;
for (int i = 2; i <= n / 2; i++)
{
if (n % i == 0)
{
flag = true;
break;
}
}
if (!flag)
System.out.println(n+ " is a prime number.");
else
System.out.println(n + " is not a prime number.");
}
void amstrong()
{
int c=0,a,temp;
int num=sc.nextInt();
temp=num;
while(num>0)
{
a=num%10;
num=num/10;
c=c+(a*a*a);
}
if(temp==c)
System.out.println("Armstrong....");
else
System.out.println("Not a Amstrong....");
}
}

5) Write a Java Program to find the second-highest number in an array.

public class abc{

public static int SecondLargest(int[] a,int n)
{
int temp;
for(int i=0;i<n;i++)
{
 for(int j=i;j<n;j++)
{
if(a[i]>a[j])
{
temp=a[i];
a[i]=a[j];
a[j]=temp;
}
}
}
return a[n-2];
}
public static void main(string args[])
{
int a[]={1,2,5,6,3,2};
system.out.println("SecondLargest: "+secondlargest(a,6));
}
}

6) Write a program to print the area of a rectangle by creating a class named

'Area' taking the values of its length and breadth as parameters of its
constructor and having a method named 'returnArea' which returns the area
of the rectangle. Length and breadth of rectangle are entered through
keyboard.

import java.until.Scanner;
class area
{
int length;
int breadth;
area(int a,int b)
{
length=a;
breadth=b;
}
public int areareturn()
{
return length*breadth;
}
}
public class Rectangle
{
public static void main(String []args)
{
Scanner obj=new Scanner(System.in);
int a,b;
System.out.println("Enter the length of Rectangle");
 a=obj.nextlnt();
System.out.println("Enter the breadth of Rectangle");
b=obj.nextln();
System.out.println("Area="+obj.areareturn(1));
}
}

7) Print the sum, difference and product of two complex numbers by creating
a class named 'Complex' with separate methods for each operation whose
real and imaginary parts are entered by user.

import java.util.Scanner;
class question
{
public static void main(String [] args)
{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the real part of first complex no..... ");
int r1=sc.nextInt();
System.out.println("Enter the imaginary part of first complex no.....");
//r=Real,i=Imagenary
int i1=sc.nextInt();
System.out.println("Enter the real part of Second complex no....");
int r2=sc.nextInt ();
System.out.println("Enter the imaginary part of Second complex no. : ");
int i2=sc.nextInt ();
complex c = new complex();
c.add(r1, i1, r2, i2);
c.sub(r1, i1, r2, i2);
c.mul (r1, i1, r2, i2);
}
}
class complex
{
void add(int r1, int i1, int r2, int i2)
{
int real=r1+r2;
int img=i1+i2;
System.out.println("Addition of Complex Number :"+real+"+"+img+"i");
}
void sub(int r1, int i1,int r2, int i2)
{
int real=r1-r2;
int img=i1-i2;
System.out.println("Subtraction of Complex Number :"+real+"-"+img+"i");
}
void mul (int r1, int i1, int r2, int i2)
{
int real=(r1*r2)-(i1*i2);
int img=(r2* i1)+(r1*i2);
System.out.println("Multiplication of Complex Number :" +real+"*"+img+"i");
}
}

8) Write a class Box with suitable data members and member functions.
Make use of Package to save this class.

package out;
import java.util.Scanner;
class Box
{
Scanner sc=new Scanner(System.in);
String name;
int age;
float height;
void accept()
{
name=sc.nextLine();
age=sc.nextInt();
height=sc.nextFloat();
}
void disp()
{
System.out.println("Name of a person..."+name);
System.out.println("Age of a person..."+age);
System.out.println("Height of a person..."+height);
}
public static void main(String []args)
{
Box o=new Box();
o.accept();
o.disp();
}
}

9) Write a program to implement Addition and Large interfaces in a class

Operation.
import java.util.Scanner;
interface I
{
void addition(int a,int b);
void largest(int[]array,int no);
}
class operation implements I
{
public static void main(String []args)
{
Scanner sc=new Scanner(System.in);
operation o=new operation();
System.out.println("First number is....");
int a=sc.nextInt();
System.out.println("Second number is....");
int b=sc.nextInt();
o.addition(a,b);
int[]array=new int[10];
System.out.println("Enter number of elments....");
int no=sc.nextInt();
System.out.println("Array is....");
for(int i=0;i<no;i++)
{
array[i]=sc.nextInt();
}
o.largest(array,no);
}
public void addition(int a,int b)
{
int c;
c=a+b;
System.out.println("Addition of number is...."+c);
}
public void largest(int[]array,int no)
{
int max=0;
int min=100;
for(int i=0;i<no;i++)
{
if(array[i]>max)
max=array[i];
}
System.out.println("Largest number is ..."+max);
}
}
10) Raise an exception if user enters number outside the range of 0 to 9.

import java.util.Scanner;
class OutRangeException extends OutRangeException
{
public OutRangeException()
{
super("Out of Range Number");
}
class question10
public static void main(string []args)
{
Scanner s=new Scanner(System.in);
System.out.println("Enter From 0 to 9");
int a=s.nextInt();
try{
if(a>0 && a<9)
{
System.out.println("You Have Entered Valid Number"+a);
}
else{
throw new OutRangeException();
}
}
catch (OutRangeException e){
System.out.println(e);
}
}
}