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.