Now that we've set up the calculator's interface, we can move on to implementing the functionality behind each button.ģ. Lastly, we set the dimensions for the display and buttons: Dimension displayDimension = new Dimension(dimW, dimH) ĭimension regularDimension = new Dimension(dimW, dimH) ĭimension rColumnDimension = new Dimension(dimW, dimH) ĭimension zeroButDimension = new Dimension(dimW, dimH) ĭtPreferredSize(displayDimension) Add buttons to panels and panels to JFrame We then add the buttons to the respective panels and the panels to the JFrame: FlowLayout f1 = new FlowLayout(FlowLayout.CENTER) įlowLayout f2 = new FlowLayout(FlowLayout.CENTER, 1, 1) We set the GridLayout for the main calculator window: GridLayout grid = new GridLayout(5, 5) įor each row of buttons, we create a JPanel and set its layout to FlowLayout. In this project, we'll primarily use GridLayout and FlowLayout. To arrange the UI elements on the JFrame, we use layout managers. 6.3 Links to Resources for Learning More About Java Programming and Swing UI DevelopmentĢ.3 Setting Up the Layout Managers and Dimensions for Elements.6.2 Suggestions for Improving the Calculator's Design and User Experience.6.1 Ideas for Extending the Calculator's Functionality.4.1 Explanation of the Main Code Structure and Components.3.3 Handling Button Actions and User Input.3.2 Creating Helper Functions: clear(), getSqrt(), getPosNeg(), and getResult().3.1 Initializing the Calculator State and Variables.2.3 Setting Up the Layout Managers and Dimensions for Elements.2.2 Defining Buttons, Panels, and Other UI Elements.2.1 Creating a JFrame and Setting Its Properties.1.2 Importance of Building a Calculator as a Beginner's Project.1.1 Brief Overview of the Simple Calculator Project in Java.res = n1 * n2 : This line multiplies the n1 and n2 variables together and assigns the result to the res variable.case '*': : This line defines a case for when the op variable is *.(n1 + " - " + n2 + " = " + res) : This line prints the equation and result of the subtraction operation to the console.res = n1 - n2 : This line subtracts the n2 variable from the n1 variable and assigns the result to the res variable.case '-': : This line defines a case for when the op variable is.break : This line ends the case block.(n1 + " + " + n2 + " = " + res) : This line prints the equation and result of the addition operation to the console.res = n1 + n2 : This line adds the n1 and n2 variables together and assigns the result to the res variable.case '+': : This line defines a case for when the op variable is +.switch(op) : This line starts a switch statement, which allows the program to execute different code based on the value of the op variable.n2 = input.nextDouble() : This line reads a Double value from the input Scanner and assigns it to the n2 variable.("Enter the Number 2 :") : This line prints a message to the console asking the user to enter the second number.Solution: Here is a java cli example that performs simple. n1 = input.nextDouble() : This line reads a Double value from the input Scanner and assigns it to the n1 variable. Question: Write a java program that does simple mathematical operations.("Enter the Number 1 :") : This line prints a message to the console asking the user to enter the first number.op = input.next().charAt(0) : This line reads a single character from the input Scanner and assigns it to the op variable.("Choose an Operator :") : This line prints a message to the console asking the user to choose an operator.("+, -, *, or /") : This line prints a message to the console asking the user to enter an operator.Double n1, n2, res : This line declares three Double variables called n1, n2, and res to store the two numbers entered by the user and the result of the calculation, respectively.char op : This line declares a char variable called op to store the operator entered by the user.Scanner input = new Scanner(System.in) : This line creates a new Scanner object called input, which reads input from the standard input stream ( System.in).public static void main(String args) : This line defines the main method, which is the entry point for the program.class Calculator: This line declares a new class called Calculator.
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