Area and circumfrence of circle

Area and circumfrence of circle

• Open netbeans and make new application.
• Open jFrame component and put the other components from pallet like given below:
  
• We have kept two buttons:


1.  Area
2.  Perimeter

• Now we will write the code of area button.
Code for area
• Code is given below:
  
• Here we have taken double method instead of integer because it is capable to work with higher numbers as well as decimals.
• Declear variable.
• Connect first text field.
• Put the formula of area of circle which is πr×r  which we have written as a*a*22/7  where * is sign of multiply.
• Put the result in result text field.
Code for perimeter


• Code is given below:
  
• Coding is like same as of area button but the difference is of formula.
• Formula is 2×πr  which we have written as 2*a*22/7
• Put the result in result text field.
• Our program is ready.

Area and perimeter of rectangle

Area and perimeter of rectangle

• Open netbeans and make new application.
• Open jFrame component and put the other components from pallet like given below:
  
• We have kept two buttons:

1. Area

   2.  Perimeter

• Now we will write the code of area button.
Code for area
• Code is given below:
  
• Here we have taken double method instead of integer because it is capable to work with higher numbers as well as decimals.
• Declear variable.
• Connect first text field.
• Put the formula of area of rectangle which is length × bredth which we have written as a × b where * is sign of multiply.
• Put the result in result text field.
Code for perimeter


Code is given below:

Coding is like same as of area button but the difference is of formula.
Formula is 2(L+B) which we have written as c=a+b and then d=2*c.
d is result.
Put the result in result text field.
Our program is ready.

Area and perimeter of square

Area and perimeter of square

• Open netbeans and make new application.
• Open jFrame component and put the other components from pallet like given below:
  
• We have kept two buttons:

1. Area
2. Perimeter

• Now we will write the code of area button.

Code for area

• Code is given below:
  
• Here we have taken double method instead of integer because it is capable to work with higher numbers as well as decimals.
• Declear variable.
• Connect first text field.
• Put the formula of area of square which is side × side which we have written as a* a where * is sign of multiply.
• Put the result in result text field.

Code for perimeter

• Code is given below:
  
• Coding is like same as of area button but the difference is of formula.
• Formula is side × 4 which we have written as a*4.
• Put the result in result text field.
• Our program is ready.

Age calculator

Age calculator

• Open netbeans and new application.
• Open new frame and drag the components and arrange them as given below

• Here I have written the year 2020 you can write any year as your wish.
• Open source code and write the code given below
  
• Declear the variable and join the jTextField1 with a.
• Here when we will subtract our birth year from the year till you want your age will provide the correct age you want.
• Store this value in variable b and print it in next jTextField.
• Now your program is ready.

Interchange two value without third variable

Interchange two values without third variable

• Make new jFrame and add the components to frame like given in below figure.

• Open source code and declear three variables a,b,c as integer and also type the code of text fields.
• Type the code given below 
  
• Now I will explain how java interchanges the value:

1. Let a=10,b=20.
2. Here a=a+b means a=10+20=30.
3. Now value of a=30.
4. Then b=a-b means b=30-20=10.
5. Then a=a-b means a=30-10=20.
6. So by this java interchanges the value.

• Now print a & b.
• Run the file and see what happens.

Interchange two values with third variable

Interchange two values with third variable

• Make new jFrame and add the components to frame like given in below figure.

• Open source code and declear three variables a,b,c as integer and also type the code of text fields.
• Type the code given below 
  
• Now I will explain how java interchanges the value:

1. Let a=10,b=20,c=0.
2. Here c=a means c=10.
3. Now a=0.
4. Then a=b means a=20.
5. Now b=0.
6. Then b=c means b=10.
7. So by this java interchanges the value.

• Now print a & b.
• Run the file and see what happens.

Division java programming

Division java programming

Open netbeans and open new frame.

Put the components from pallet to jFrame as given below

• Open source code window by double clicking on button.
• Write the code as given below

• Open source code window by double clicking on button.
• Write the code as given below
• Handling with numbers we us either short as short or long as long or integer as it.
• We have use int.
• Integer.parseInt is a code us for coding a number.
• a and b at variables use to type number while c is used to store the the value of a and b and also to show result.
• / sign is use between a and b for the division.
• After completing it ,run the program and see what happens