for loop sample program

sample program using for loop in java.
this program will ask the user to input how many numbers they want to print:

import java.util.Scanner;

public class samplefor
{
public static void main(String args[])
{
Scanner input=new Scanner(System.in);
int num;
int x;

System.out.print("How many numbers you want to print:");
num=input.nextInt();

for(x=0; x<=num; x++)
{
System.out.println(x");
}
}
}

for Loop

for loop is a part of programming to execute program continuesly until it reaches the final looping of final number of loop.

example program.

int x;
for(x=0; x<=10; x++)
{
System.out.println(x);
}

sample output:

0
1
2
3
4
5
6
7
8
9
10

syntax in programming

syntax is a rules in programing.

for loop sysntax:

for(init; condition; inc/dec)
{
statements;
}

Swap number using java program

1. /*
2. Swap Numbers Java Example
3. This Swap Numbers Java Example shows how to
4. swap value of two numbers using java.
5. */
6.
7. public class SwapElementsExample {
8.
9. public static void main(String[] args) {
10.
11. int num1 = 10;
12. int num2 = 20;
13.
14. System.out.println("Before Swapping");
15. System.out.println("Value of num1 is :" + num1);
16. System.out.println("Value of num2 is :" +num2);
17.
18. //swap the value
19. swap(num1, num2);
20. }
21.
22. private static void swap(int num1, int num2) {
23.
24. int temp = num1;
25. num1 = num2;
26. num2 = temp;
27.
28. System.out.println("After Swapping");
29. System.out.println("Value of num1 is :" + num1);
30. System.out.println("Value of num2 is :" +num2);
31.
32. }
33. }
34.
35. /*
36. Output of Swap Numbers example would be
37. Before Swapping
38. Value of num1 is :10
39. Value of num2 is :20
40. After Swapping
41. Value of num1 is :20
42. Value of num2 is :10
43. */

this program will swap number numbers.

Data Types

Data types
1. Boolean
2. byte
3. char
4. double
5.float
6.int
7.short

next Lesson i will explain to you all data types. .

Break statement in java

Break statement is one of the several control statements Java provide to control the flow of the program. As the name says, Break Statement is generally used to break the loop of switch statement.

Please note that Java does not provide Go To statement like other programming languages e.g. C, C++.

This form of break statement is used to jump out of the loop when specific condition occurs. This form of break statement is also used in switch statement.

For example,


for(int var =0; var < 5 ; var++){
System.out.println("Var is : " + var);
if(var == 3)
break;
}


Labeled Break Statement
The unlabeled version of the break statement is used when we want to jump out of a single loop or single case in switch statement. Labeled version of the break statement is used when we want to jump out of nested or multiple loops.
For example,
Outer:
for(int var1=0; var1 < 5 ; var1++)
{
for(int var2 = 1; var2 < 5; var2++)
{
System.out.println("var1:" + var1 + ", var2:" + var2);

if(var1 == 3)
break Outer;

}
}


next lesson about continue statement

Factoring in java program

this program will show how to get the factorial using java program.

public class NumberFactorial {

public static void main(String[] args) {

int number = 5;

/*
* Factorial of any number is !n.
* For example, factorial of 4 is 4*3*2*1.
*/

int factorial = number;

for(int i =(number - 1); i > 1; i--)
{
factorial = factorial * i;
}

System.out.println("Factorial of a number is " + factorial);
}
}

Find Largest and Smallest Number in an Array using java

/*
Find Largest and Smallest Number in an Array Example
This Java Example shows how to find largest and smallest number in an
array.
*/
public class FindLargestSmallestNumber {

public static void main(String[] args) {

//array of 10 numbers
int numbers[] = new int[]{32,43,53,54,32,65,63,98,43,23};

//assign first element of an array to largest and smallest
int smallest = numbers[0];
int largetst = numbers[0];

for(int i=1; i< numbers.length; i++)
{
if(numbers[i] > largetst)
largetst = numbers[i];
else if (numbers[i] < smallest)
smallest = numbers[i];

}

System.out.println("Largest Number is : " + largetst);
System.out.println("Smallest Number is : " + smallest);
}
}

/*
Output of this program would be
Largest Number is : 98
Smallest Number is : 23

Even or Odd program using java

This program will determine if the number inputted by the user is even or odd.

we use here a modulo operator to get the even or odd numbers.

Modulo - this operator use in programming to get the remainder.

sample program:

import java.util.Scanner;

public class EvenOdd
{
public static void main(String args[])
{
Scanner input=new Scanner(System.in);

int num;

System.out.print("Enter a number:");
num=input.nextInt();

if(num%2==0)
{
System.out.print("Even number");
}
else if(num%2==1)
{
System.out.print("Odd Numbers");
}
}
}

Find Largest and Smallest Number in an Array Example

1./*2. Find Largest and Smallest Number in an Array Example3.
This Java Example shows how to find largest and smallest number in an 4. array.5.*/

public class FindLargestSmallestNumber
{
public static void main(String[] args)
{

//array of 10 numbers11.

int numbers[] = new int[]{32,43,53,54,32,65,63,98,43,23};
//assign first element of an array to largest and smallest14.
int smallest = numbers[0];
int largetst = numbers[0];
for(int i=1; i< numbers.length; i++)
{
if(numbers[i] > largetst)
largetst = numbers[i];
else if (numbers[i] < smallest)
smallest = numbers[i];
}
System.out.println("Largest Number is : " + largetst);
System.out.println("Smallest Number is : " + smallest);
}
}
/*32.Output of this program would be33.
Largest Number is : 9834.
Smallest Number is : 2335.*/

Computng the area of circumference usign java

This program in java will compute the area of circumference .

Simple String program

import java.io.*;

public class javastring sample
{
public static void main(String args[])
{
/* string in java represents the character sequence */

/* create string empty*/

String s1=new String(" ");

/* create new string object whose content whose content whould be "Hello world"*/
String S2=new String("Hello World");


/* getting the length of the string */

System.out.print(s2.length());



}
}

String Manipulation

String manipulation using for loop.

sample program:
this program will show result asterisk triangle.
*
**
***
****

import java.io.*;

public class trian
{
public static void main(String args[])
{
int x=1;
int y=1;
for(x=1; x<4; y="1;">{
System.out.print("*");
}
System.out.print("\n");
}
}
}

Compute two numbers in java using user input

this program will ask the user to input two numbers and get the sum.

import java.io.*;
import java.util.Scanner;

public class getsum
{
public static void main(String args[])
{

Scanner input=new Scanner(System.in);
int num1,num2;
int sum=0;

System.out.print("Enter First Number:");
num1=input.nextInt();

System.out.print("Enter Second Number:");
num2=input.nextInt();

sum=num1+num2;

System.out.print("The sum is:" + sum);


}
}

user input in java

The program will ask the user to input name, address and the program will show what they input.

we use here the namespace which is the util.scanner.

User input in java using string;

name of java file: javainput

Sample program:

import java.util.scanner;

public class javainput

{

public static void main(String args[])

{

Scanner input=new Scanner(System.in);

//declaration

String name,address;

System.out.println("Enter your name:");

name=input.next();

System.out.println("Enter your name:");

address=input.next();

//displaying the result

System.out.print("Your Name:" + name);

System.out.print("Your Name:" + add);

}

}

String in Java

he String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class.

Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example:

     String str = "abc";  

sample program.

import java.io.*;

public class stringsample

{

public static void main(String args[])

{

System.out.print("Hello World");

System.out.print("Welcome to my String Java program");

}

}

while loop sample program

import java.io*;

public class loopwhile
{
public static void main(String args[])
{
int x=1;
while(x<=10)
{
System.out.print(x);
x++;
}
}
}

while Loop

Looping is a part of programming which is the program executed continously until it reaches the

If Statement

if statement is a conditional statement in programming. In this statement we are using the conditonal operators. this is true or false only. if the conditional statement is true the program execute the true statements, if the conditional statement is false the program execute the false statements.

sample program:

this program will show to you if the grade of students is greater than 75 the program will show message "Your passed" else "Sorry your Failed".

import java.io.*;

public class sample
{
public static void main(String args[])
{
int average=75;

if(average>=75)
{
System.out.print("Your Passed");
}
else
{
System.out.print("Your Failed");
}

}

}

Conditional Operators

Conditional operators are used in programming to perform condition in a program to execute statement.


1. (>) greater than
2. (<) Less than
3. (>=) Greater than equal
4. (<=) Less that equal
5. (==) Equal
6. (!=) not equal

next lesson is if statement.

Keywords in Java programming

The following keywords in java programming are:

abstract assert boolean break byte case catch char class

const continue default do double else enum extends final

finally float for goto if implements import instanceof

int interface long native new package private protected public

return short static strictfp super switch synchronized this throw

throws transient try void volatile while

it is used in java programming to implement a code and generate a function to have a correct statement.