The following Java programs are fundamental & simple programs used for academic record purpose.
1. Welcome to java
class Triangle
18. Linear search
1. Welcome to java
class Hello
{
public static void main(String args[])
{
System.out.println("Welcome to java ");
}
}
output
javac Hello.java
java Hello
Welcome to java
2. To find the big number
class Big
{
public static void main(String args[])
{
int a=Integer.parseInt(args[0]);
int b=Integer.parseInt(args[1]);
if(a>b)
System.out.println("given number a is big" +a);
else
System.out.println("given number b is big" +b);
}
}
Output:
javac Big.java
java Big 12 32
given number b is big 32
3. Operators
class Sum
{
public static void main(String args[])
{
int a=65;
int b=47;
int c=a+b;
int d=a-b;
int e=a*b;
System.out.println("sum given numbers a & b " +c);
System.out.println("difference of given numbers a & b" +d);
System.out.println("multiplication of given numbers a & b" +e);
}
}
Output:
javac Sum.java
java Sum
Sum of given numbers a & b 112
Difference of given numbers a & b 18
Multiplication of given numbers a & b 3055
4. Even or odd
class Evenodd
{
public static void main(String args[])
{
int a=Integer.parseInt(args[0]);
if(a%2==0)
System.out.println("given number a is even" +a);
else
System.out.println("given number a is odd" +a);
}
}
Output:
javac Evenodd.java
java Evenodd 2
Given number a is even2
5. factorial and its average
class Factorial
{
public static void main(String args[])
{
int fact=1;
int n=Integer.parseInt(args[0]);
for(int i=1;i<=n;i++)
{
fact=fact*i;
}
System.out.println("factorial of given number is "+sum);
double avg=sum/n;
System.out.println("Average of factorial is "+avg);
}
}
Output
javac Factorial.java
java Factorial 5
factorial of given number is 120
average of factorial is 24.0
6. Fibonacci Series
class Fibonacci
{
public static void main(String args[])
{
int n=Integer.parseInt(args[0]);
int next,f=0,s=1;
System.out.println(+f);
System.out.println(+s);
for (int i=1;i<=(n-2);i++)
{
next=f+s;
System.out.println(+next);
f=s;
s=next;
}
}
}
output:
javac Fibonacci.java
java Fibonacci 7
0
1
1
2
3
5
7. print triangle with ‘*’
class Triangle
{
public static void main(String args[])
{
loop1:for(int i=0;i<=100;i++)
{
System.out.println();
if(i>10) break;
for(int j=0;j<=100;j++)
{
System.out.print("*");
if(i==j) continue loop1;
}
}
}
}
Out put:
javac Triangle.java
java Triangle
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
* * * * * * * * *
8. Palindrome or not
import java.io.*;
class Palindrome
{
public static void main(String args[])
{
try
{
BufferedReader object=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter number");
int num=Integer.parseInt(object.readLine());
int n=num;
int rev=0;
System.out.println("Number:");
System.out.println(""+num);
for(int i=0;i<=num;i++)
{
int r=num%10;
num=num/10;
rev=rev*10+r;
i=0;
}
System.out.println("After reversing the number:"+"");
System.out.println(""+rev);
if(n==rev)
{
System.out.println("Number is palindrome");
}
else
{
System.out.println("number is not palindrome");
}
}
catch(Exception e)
{
System.out.println("out of range");
}
}
}
Output:
javac Palindrome.java
java Palindrome
Enter the number 1221
After reversing number
1221
Given number is Palindrome
9. find area using multiple class
class Room
{
float length;
float breath;
void getdata(float l, float b)
{
length=l;
breath=b;
}
}
class Roomarea
{
public static void main(String args[])
{
float area;
Room room1=new Room();
room1.getdata(14,10);
area=room1.length*room1.breath;
System.out.println("Area :" +area);
}
}
Output:
javac Roomarea.java
java Roomarea
Area =140.0
10. print transpose of given matrix
import java.io.*;
class Trans
{
public static void main(String args[]) throws IOException
{
int a[][]=new int[5][5];
int i,j;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter how many row and columns for matrix A");
int m=Integer.parseInt(br.readLine());
int n=Integer.parseInt(br.readLine());
System.out.println("enter the elements into matrix ");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
a[i][j]=Integer.parseInt(br.readLine());
}
}
System.out.println("Given matrix is .....");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
System.out.print("\t" +a[i][j]);
}
System.out.println();
}
System.out.println("Transpose of given matrix is .....");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
System.out.print("\t" +a[j][i]);
}
System.out.println();
}
}
}
Output:
Javac Trans.java
Java Trans
Enter how many rows and columns in matrix A:
2
2
Enter the elements into matrix A:
1
2
3
4
Given matrix is ….
1 2
3 4
Transpose of given matrix is….
1 3
2 4
11. Matrix Addition
import java.io.*;
class Addition
{
public static void main(String args[]) throws IOException
{
int a[][]=new int[5][5];
int b[][]=new int[5][5];
int c[][]=new int[5][5];
int i,j;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter how many row and columns for matrix A");
int m=Integer.parseInt(br.readLine());
int n=Integer.parseInt(br.readLine());
System.out.println("enter the elements into matrix A");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
a[i][j]=Integer.parseInt(br.readLine());
}
}
System.out.println("Enter how many row and columns for matrix B");
int p=Integer.parseInt(br.readLine());
int q=Integer.parseInt(br.readLine());
System.out.println("enter the elements into matrix B");
for(i=0;i<p;i++)
{
for(j=0;j<q;j++)
{
b[i][j]=Integer.parseInt(br.readLine());
}
}
if(m!=p&&n!=q)
{
System.out.println("Addition not possible");
System.exit(0);
}
else
for(i=0;i<m;i++)
{
System.out.println();
for(j=0;j<n;j++)
{
c[i][j]=a[i][j]+b[i][j];
}
}
System.out.println("result matrix is .....");
for(i=0;i<m;i++)
{
System.out.println();
for(j=0;j<n;j++)
{
System.out.print("\t" +c[i][j]);
}
}
}
}
Output:
javac Addition.java
java Addition
Enter how many rows and columns for matrix A:
2
2
Enter the elements into matrix A:
1
2
3
4
Enter how many rows and columns for matrix B:
2
2
Enter elements into matrix B:
1
2
3
4
Result matrix is….
2 4
6 8
12. Matrix multiplication.
import java.io.*;
class Multiplication
{
public static void main(String args[]) throws IOException
{
int a[][]=new int[5][5];
int b[][]=new int[5][5];
int c[][]=new int[5][5];
int i,j;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter how many row and columns for matrix A");
int m=Integer.parseInt(br.readLine());
int n=Integer.parseInt(br.readLine());
System.out.println("enter the elements into matrix A");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
a[i][j]=Integer.parseInt(br.readLine());
}
}
System.out.println("Enter how many row and columns for matrix B");
int p=Integer.parseInt(br.readLine());
int q=Integer.parseInt(br.readLine());
System.out.println("enter the elements into matrix B");
for(i=0;i<p;i++)
{
for(j=0;j<q;j++)
{
b[i][j]=Integer.parseInt(br.readLine());
}
}
if(m!=p&&n!=q)
{
System.out.println("Addition not possible");
System.exit(0);
}
else
for(i=0;i<m;i++)
{
System.out.println();
for(j=0;j<n;j++)
{
c[i][j]=a[i][j]+b[i][j];
}
}
System.out.println("result matrix is .....");
for(i=0;i<m;i++)
{
System.out.println();
for(j=0;j<n;j++)
{
System.out.print("\t" +c[i][j]);
}
}
}
}
Output:
javac Matrix.java
java Matrix
Enter how many rows and columns for matrix A:
2
2
Enter the elements into matrix A:
1
2
3
4
Enter how many rows and columns for matrix B:
2
2
Enter elements into matrix B:
5
6
7
8
Result matrix is….
6 8
10 12
13. find complex number using constructors
class complex
{
int real,img;
complex() {}
complex(int a)
{
real=img=a;
}
complex(int x, int y)
{
real=x;
img=y;
}
complex sum(complex c1, complex c2)
{
complex c3=new complex();
c3.real=c1.real+c2.real;
c3.img=c1.img+c2.img;
return c3;
}
void display()
{
System.out.println(real+"+i"+img);
}
}
class Complexnum
{
public static void main(String args[])
{
complex c1=new complex(1,2);
complex c2=new complex(2);
complex c3=new complex();
c3=c3.sum(c1,c2);
c3.display();
}
}
Output:
Javac Complexnum.java
Java Complexnum
3+i4
14. find concatenation of two strings
class Concat
{
public static void main(String args[])
{
String str1="Table";
String str2="Tennis";
String Game=str1+" "+str2;
System.out.println(Game);
}
}
Output:
Javac Concat.java
Java Concat
Tabie tennis
15. bubble sort
import java.io.*;
class Bubblesort
{
public static void main(String args[])
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int n=0,i,j,t;
int a[]=new int[10];
System.out.println("Enter size of the array:");
try
{
n=Integer.parseInt(br.readLine());
}
catch(Exception e) {}
System.out.println("Enter elements into the array:");
try
{
for(i=0;i<n;i++)
a[i]=Integer.parseInt(br.readLine());
}
catch(Exception e) {}
for(i=0;i<n-1;i++)
for(j=0;j<n-1-i;j++)
if(a[j]>a[j+1])
{
t=a[j];
a[j]=a[j+1];
a[j+1]=t;
}
System.out.println("The sorted array is:");
for(i=0;i<n;i++)
System.out.println(a[i]);
}
}
Output:
javac Bubblesort.java
java Bubblesort
Enter the size of array
5
Enter the elements into the array
45
34
76
12
69
The sorted array is
12 34 45 69 76
16. selection sort
import java.io.*;
class Selectionsort
{
public static void main(String args[])
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int n=0,i,j,t;
int a[]=new int[10];
System.out.println("Enter size of the array:");
try
{
n=Integer.parseInt(br.readLine());
}
catch(Exception e){}
System.out.println("Enter elements into the array:");
try
{
for(i=0;i<n;i++)
a[i]=Integer.parseInt(br.readLine());
}
catch(Exception e){}
i=0;
while(i<n-1)
{
int key=i;
for(j=i+1;j<n;j++)
{
if(a[j]<a[key])
{
key=j;
}
}
t=a[key];
a[key]=a[i];
a[i]=t;
i++;
}
System.out.println("The sorted array is:");
for(i=0;i<n;i++)
System.out.println(a[i]);
}
}
Output:
javac Selectionsort.java
java Selectionsort
Enter the size of array
5
Enter the elements into the array
45
34
76
12
69
The sorted array is
76 69 45 34 12
17. Binary Search
import java.lang.*;
import java.util.*;
import java.io.*;
class Search
{
public int binarysearch(int[]a,int key)
{
int f=1;
int low=0;
int high=a.length-1;
int mid=(low+high)/2;
while(low<=high)
{
if(a[mid]==key)
{
f=0;
break;
}
if(a[mid]<key)
low=mid+1;
else
high=mid-1;
mid=(low+high)/2;
}
return(f);
}
}
class Binarysearch
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
Search s=new Search();
int[]a;
int i,k,n;
int f=1;
System.out.println("Binary search");
System.out.println("enter your choice");
System.out.println("Enter the size of array");
n=sc.nextInt( );
a=new int[n];
System.out.println("Enter the elements");
for(i=0;i<n;i++)
a[i]=sc.next();
System.out.println("Enter the element to search:");
k=sc.nextInt();
int c=s.binarysearch(a,k);
if(c==0)
System.out.println("The element is found");
else
System.out.println("The elements is not found");
}
}
Output:
javac Binarysearch.java
java Binarysearch
BINARY SEARCH
Enter your choice
Enter the size of array
5
Enter the elements into the array
2
4
1
8
9
Enter the element to search
8
The element is found
Output:
javac Binarysearch.java
java Binarysearch
BINARY SEARCH
Enter your choice
Enter the size of array
5
Enter the elements into the array
2
4
1
8
9
Enter the element to search
10
The element not found
18. Linear search
import java.lang.*;
import java.util.*;
import java.io.*;
class Search
{
public int linearsearch(int[]a,int key)
{
int flag=1;
for(int i=0;i<a.length;i++)
{
if(a[i]==key)
{
flag=0;
}
}
return(flag);
}
}
class Linearsearch
{
public static void main(String args[])
{
Scanner sc=new Scanner(System.in);
{
Search s=new Search( );
int []a;
int i,k,n,ch;
int f=1;
System.out.println("Linear Search\n");
System.out.println("Enter the size of array");
n=sc.nextInt( );
a=new int[n];
System.out.println("enter the elements");
for (i=0;i<n;i++)
a[i]=sc.nextInt( );
System.out.println("enter the element to search");
k=sc.nextInt( );
f=s.linearsearch(a,k);
if(f==0)
System.out.println("The element is found");
else
System.out.println("Element is not found");
}
}
}
Output:
javac Linearsearch.java
java Linearsearch
LINEAR SEARCH
Enter your choice
Enter the size of array
5
Enter the elements into the array
2
4
1
8
9
Enter the element to search
8
The element is found
Output:
javac Linearsearch.java
java Linearsearch
LINEAR SEARCH
Enter your choice
Enter the size of array
5
Enter the elements into the array
2
4
1
8
9
Enter the element to search
10
The element not found