Area & Perimeter of Square - Java Program (Basic) | Reference to class XI - I.T. (802) | ARBX CodeX

Program need: Take sides of a square in 1 textfield and calculate its Area and Perimeter in 2 different textfields. The program should have an exit button to close the application.
A very basic way to create this program is shown in the video. Illustrated properly.

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Important formulae used in program:
Area of Square: side*side
Perimeter of square = 4*side

Important Codes used:
//code for calculating area of square
double side = Double.parseDouble(jTextField1.getText()); //double is used for decimals. side of sq can be in decimal
double area = side * side;
//printing the area of square
jTextField2.setText(Double.toString(area));
//code for calculating perimeter
double peri = 4 * side;
jTextField3.setText(Double.toString(peri)); //printing the perimeter

//code to exit
System.exit(0);
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