Hello guys. I am trying to create a calculator program in a GUI window. When I compile the code I get the following errors:
Severity and Description Path Resource Location Creation Time Id
The local variable add is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 548
The local variable contentPane is never read CalculatorProgr am/src/Calculator Calculator.java line 17 1211809496146 545
The local variable divide is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 551
The local variable layout is never read CalculatorProgr am/src/Calculator Calculator.java line 20 1211809496146 552
The local variable multiply is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 550
The local variable num1 is never read CalculatorProgr am/src/Calculator Calculator.java line 18 1211809496146 546
The local variable num2 is never read CalculatorProgr am/src/Calculator Calculator.java line 18 1211809496146 547
The local variable subtract is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 549
Here is my code:
The code is not yet finished. My second question is how do you cause an event to happen when a button is clicked. When the for example add button is clicked I want to do this:
Severity and Description Path Resource Location Creation Time Id
The local variable add is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 548
The local variable contentPane is never read CalculatorProgr am/src/Calculator Calculator.java line 17 1211809496146 545
The local variable divide is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 551
The local variable layout is never read CalculatorProgr am/src/Calculator Calculator.java line 20 1211809496146 552
The local variable multiply is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 550
The local variable num1 is never read CalculatorProgr am/src/Calculator Calculator.java line 18 1211809496146 546
The local variable num2 is never read CalculatorProgr am/src/Calculator Calculator.java line 18 1211809496146 547
The local variable subtract is never read CalculatorProgr am/src/Calculator Calculator.java line 19 1211809496146 549
Here is my code:
Code:
package Calculator; //import declarations import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JButton; import javax.swing.JTextField; import java.awt.Container; import java.awt.FlowLayout; //create a new class public class Calculator { //create the main function public static void main(String[] args) { //variable declaration JFrame frame; Container contentPane; JTextField num1, num2; JButton add, subtract, multiply, divide; JLabel result; FlowLayout layout; frame = new JFrame(); frame.setTitle("Calculator"); contentPane = frame.getContentPane(); num1 = new JTextField("Number 1"); num2 = new JTextField("Number 2"); add = new JButton("Add"); subtract = new JButton("Subtract"); multiply = new JButton("Multiply"); divide = new JButton("Divide"); result = new JLabel("Result"); } }
Code:
int number1, number2, sum; number1 = (int)((Double.parseDouble(num1.getText()))); number2 = (int)((Double.parseDouble(num2.getText()))); sum = number1 + number2; result.setText("" + sum);
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