KING - JAVA CODING EXAMPLES: PROGRAMMING FOR BEGINNERS

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JAVA CODING

EXAMPLES

PROGRAMMING FOR BEGINNERS

J KING

Java program to print 'Hello world'

SYNTAX

javac HelloWorld.java

Executing/Running java program

When you have compiled the Java program, and if it has been successfully compiled, you can run the Java program to generate the output.

SYNTAX

java HelloWorld

PROGRAM

public class HelloWorld

{

public static void main(String []args)

{

//printing the message

System.out.println("Hello World!");

}

}

Output

Hello World!

Print different type of values in Java

We will declare and describe some of the different types of variables in this program, and then print them using System.out.println() method.

PROGRAM

class j2{

public static void main(String args[])

{

int num;

float b;

char c;

String s;

//integer

num = 100;

//float

b = 1.234f;

//character

c = 'A';

//string

s = "Hello Java";

System.out.println("Value of num: "+num);

System.out.println("Value of b: "+b);

System.out.println("Value of c: "+c);

System.out.println("Value of s: "+s);

}

}

Output

Value of num: 100

Value of b: 1.234

Value of c: A

Value of s: Hello Java

Read and print an integer value in Java

Here we will learn how to take an integer input from the user and print it on the screen, to take the input of an integer value-we use Scanner class, for this we must include java.util. * package in our Java program.

PROGRAM

import java.util.*;

class j3

{

public static void main(String args[])

{

int a;

//declare object of Scanner Class

Scanner buf=new Scanner(System.in);

System.out.print("Enter value of a :");

/*nextInt() method of Scanner class*/

a=buf.nextInt();

System.out.println("Value of a:" +a);

}

}

Output

Enter value of a :120

Value of a:120

Java program to find sum and average

Two integer numbers are given (input), and we have to calculate their SUM and AVERAGE.

PROGRAM

// Find sum and average of two numbers in Java

import java.util.*;

public class Numbers {

public static void main(String args[]) {

int a, b, sum;

float avg;

Scanner buf = new Scanner(System.in);

System.out.print("Enter first number : ");

a = buf.nextInt();

System.out.print("Enter second number : ");

b = buf.nextInt();

/*Calculate sum and average*/

sum = a + b;

avg = (float)((a + b) / 2);

System.out.print("Sum : " + sum + "\nAverage : " + avg);

}

}

Output

Enter first number : 100

Enter second number : 200

Sum : 300

Average : 150.0

Java program to print Christmas tree

Example:

*

***

*****

*******

***

*****

*******

*********

*****

*******

*********

***********

*******

*********

***********

*************

*

*

*******

PROGRAM

public class ChristmasTree

{

public static final int SEGMENTS = 4;

public static final int HEIGHT = 4;

public static void main(String[] args)

{

makeTree();

}

public static void makeTree()

{

int maxStars = 2*HEIGHT+2*SEGMENTS-3;

String maxStr = "";

for (int len=0; len < maxStars; len++)

{

maxStr+=" ";

}

for (int i=1; i <= SEGMENTS; i++)

{

for (int line=1; line <= HEIGHT; line++)

{

String starStr = "";

for (int j=1; j <= 2*line+2*i-3; j++)

{

starStr+="*";

}

for (int space=0; space <= maxStars-(HEIGHT+line+i); space++)

{

starStr = " " + starStr;

}

System.out.println(starStr);

}

}

for (int i=0; i <= maxStars/2;i++)

{

System.out.print(" ");

}

System.out.print("*\n");

for (int i=0; i <= maxStars/2;i++)

{

System.out.print(" ");

}

System.out.print("*\n");

for(int i=0; i <= maxStars/2-3;i++)

{

System.out.print(" ");

}

System.out.print("*******\n");

}

}

OUTPUT

Java program to find sum of all digits

Provided a number and we have to use java program to find sum of all its digits.

Example 1:

Input:

Number: 852

Output:

Sum of all digits: 15

Example 2:

Input:

Number: 256868

Output:

Sum of all digits: 35

PROGRAM

import java.util.Scanner;

public class AddDigits

{

public static void main(String args[])

{

// initializing and declaring the objects.

int num, rem=0, sum=0, temp;

Scanner scan = new Scanner(System.in);

// enter number here.

System.out.print("Enter the Number : ");

num = scan.nextInt();

// temp is to store number.

temp = num;

while(num>0)

{

rem = num%10;

sum = sum+rem;

num = num/10;

}

System.out.print("Sum of Digits of " +temp+ " is : " +sum);

}

}

Output

First run:

Enter the Number : 582

Sum of Digits of 582 is : 15

Second run:

Enter the Number : 256868

Sum of Digits of 256868 is : 35

Java program to calculate compound interest

Given the principle, rate and time, and using java program we have to find compound interest.

Example:

Enter Principal : 5000

Enter Rate : 5

Enter Time : 3

Amount : 5788.125000000001

Compound Interest : 788.1250000000009

PROGRAM

import java.util.Scanner;

public class CompoundInterest

{

public static void main(String args[])

{

// declare and initialize here.

double A=0,Pri,Rate,Time,t=1,CI;

// create object.

Scanner S=new Scanner(System.in);

// enter principal, rate, time here

System.out.print("Enter Principal : ");

Pri=S.nextFloat();

System.out.print("Enter Rate : ");

Rate=S.nextFloat();

System.out.print("Enter Time : ");

Time=S.nextFloat();

Rate=(1 + Rate/100);

for(int i=0;i

t*=Rate;

A=Pri*t;

System.out.print("Amount : " +A);

CI=A-Pri;

System.out.print("\nCompound Interest : " +CI);

}

}

Output

First run:

Enter Principal : 5000

Enter Rate : 5

Enter Time : 3

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