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我需要此代碼的幫助。結果將進入一個新窗口。我想要的是，結果是在輸入值的主窗口內。Java計算器
下面的代碼將顯示一個彈出窗口，顯示結果，而不是在零售價格框中顯示答案。我知道這可能是一個簡單的問題或修復，希望有人幫我修復這些代碼，因爲我還在學習。在內部類CalcButtonListener
package com.retailcalcu;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Retailcalculator extends JFrame{
private JPanel panel; // to reference a panel
private JLabel wholeSaleMessageLabel; // to reference a label
private JLabel markupMessageLabel; // to reference a label
private JLabel retailPriceLabel; // to reference a label
private JTextField wholeSalePriceField; // to reference the Whole Sale Price Field
private JTextField markUpPercentage; // to reference the Mark Up text field
private JTextField retailPrice; // to reference the Retail Price Field
private JButton calculateButton; // to reference button
private final int WINDOW_WIDTH = 400; // Window Width
private final int WINDOW_HEIGHT = 150; // Window Height
public static void main(String[] args){
new Retailcalculator();
}
public Retailcalculator(){
// set window title
setTitle("Retail Price Calculator");
// set widow size
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
// tell what to do when the window closes
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// build the panel and add it to the frame
buildPanel();
// add the panel to the frame's content pane
add(panel);
// display the window
setVisible(true);
}
private void buildPanel()
{
// create a label for the wholesale price
wholeSaleMessageLabel = new JLabel("Enter Wholesale Price: ");
// create a text field 15 characters wide
wholeSalePriceField = new JTextField(15);
// create a label for the mark up percentage
markupMessageLabel = new JLabel("Enter Mark Up Percentage: ");
// create a text field 15 characters wide
markUpPercentage = new JTextField(15);
// create a button with the capation "Calculate Retail Price"
calculateButton = new JButton("Calculate Retail Price");
// add an action listener to the button
calculateButton.addActionListener(new CalcButtonListener());
// create a label for the retail price
retailPriceLabel = new JLabel("The Retail Price is: $");
// create a text field 15 characters wide for the retail price
retailPrice = new JTextField(15);
// create a JPanel object and let the panel filed reference it
panel = new JPanel();
// add the labels, rext field and button compnenets to the panel
panel.add(wholeSaleMessageLabel);
panel.add(wholeSalePriceField);
panel.add(markupMessageLabel);
panel.add(markUpPercentage);
panel.add(calculateButton);
panel.add(retailPriceLabel);
panel.add(retailPrice);
/** calculateButton is an action listener class for the Calculate Button*/
}
class CalcButtonListener implements ActionListener{
// This method executes when the user clicks on the Calculate Button
public void actionPerformed(ActionEvent e)
{
String wholesaleInput; // to hold user input for wholesale price
String markUpInput; // to hold user input for mark up percentage
double retailPrice; // declare retail price as a double
double wholePrice; // declare wholesale prcie as a double
double markUp; // declare markup percentage as a double
// get the text entered by the user in the text field box
wholesaleInput = wholeSalePriceField.getText();
// convert wholesale text to double
wholePrice = Double.parseDouble(wholesaleInput);
// get the text entered by the user in the percentage text field
markUpInput = markUpPercentage.getText();
// parse out the markup percentage from the percentage text field
markUp = Double.parseDouble(markUpInput);
// do function to calculate retail price(wholesale * markup)
retailPrice = ((wholePrice * markUp) * .01) + wholePrice;
// display the results
JOptionPane.showMessageDialog(null, retailPrice);
}
}
}