Java 使用JComboBox中的计算更新JTextField
在我的代码中,我试图在某个人单击任意组合框中的选项时,在Java 使用JComboBox中的计算更新JTextField,java,swing,jtextfield,jcombobox,Java,Swing,Jtextfield,Jcombobox,在我的代码中,我试图在某个人单击任意组合框中的选项时,在JTextField中发布总价计算。我不想要名字,比如“意大利香肠”,而是实际的总数。现在我必须单击文本框并按enter键来更新数据 如何使用JComboBox中的计算更新JTextField import java.awt.* ; import javax.swing.* ; import java.awt.event.* ; class JPizza extends JFrame implements ActionListener
JTextField
中发布总价计算。我不想要名字,比如“意大利香肠”,而是实际的总数。现在我必须单击文本框并按enter键来更新数据
如何使用JComboBox
中的计算更新JTextField
import java.awt.* ;
import javax.swing.* ;
import java.awt.event.* ;
class JPizza extends JFrame implements ActionListener
{
private static final long serialVersionUID = 1L;
public static void main(String[] args)
{
JPizza myFrame = new JPizza();
myFrame.setVisible(true);
}
private static final int WIDTH = 250;
private static final int HEIGHT = 300;
private static final int X_ORIGIN = 200;
private static final int Y_ORIGIN = 100;
private static final double smallPizzaPrice = 7.00;
private static final double mediumPizzaPrice = 9.00;
private static final double largePizzaPrice = 11.00;
private static final double extraLargePizzaPrice = 14.00;
private static final int smallPizzaSize = 0;
private static final int mediumPizzaSize = 1;
private static final int largePizzaSize = 2;
private static final int extraLargeSize = 3;
private static final double cheese = 0.0, pepperoni = 1.00, peppers = 1.00, sausage = 1.00, olives = 1.00;
private static final int cheesePlace = 0, pepperoniPlace = 1, peppersPlace = 2, sausagePlace = 3, olivesPlace = 4;
int states = 0 ;
double totalPrice = 0.0;
double pizzaSizePrice = smallPizzaPrice ;
double toppingPrice = 0.0;
//Toppings & Panel
JComboBox<String> pizzaTopping;
JPanel comboboxPanel2;
//Pizza Size & Panel
JComboBox<String> pizzaSize;
JPanel comboboxPanel;
//Price Display Field and Panel
JTextField calculate;
JPanel messagePanel;
public JPizza()
{
super("Tower of Pizza");
JLabel title = new JLabel("Tower of Pizza");
add(title);
pizzaSize = new JComboBox<String>();
pizzaSize.addItem( "Small" );
pizzaSize.addItem( "Medium" );
pizzaSize.addItem( "Large" );
pizzaSize.addItem( "Extra Large" );
pizzaSize.setSelectedIndex(0);
pizzaSize.addActionListener(this);
pizzaTopping = new JComboBox<String>();
pizzaTopping.addItem( "Cheese" );
pizzaTopping.addItem( "Pepperoni" );
pizzaTopping.addItem( "Peppers" );
pizzaTopping.addItem( "Sausage" );
pizzaTopping.addItem( "Olives" );
pizzaTopping.setSelectedIndex(0);
pizzaTopping.addActionListener(this);
calculate = new JTextField(10);
calculate.addActionListener(this);
Container contentPane = getContentPane();
GridLayout contentpaneLayout = new GridLayout(5,0,10,10);
contentPane.setLayout(contentpaneLayout);
comboboxPanel = new JPanel();
GridLayout comboboxPanelLayout = new GridLayout(2,0);
comboboxPanel.setLayout(comboboxPanelLayout);
comboboxPanel.add(pizzaSize);
contentPane.add(comboboxPanel);
comboboxPanel2 = new JPanel();
GridLayout comboboxPanelLayout1 = new GridLayout(2,0);
comboboxPanel2.setLayout(comboboxPanelLayout1);
comboboxPanel2.add(pizzaTopping);
contentPane.add(comboboxPanel2);
messagePanel = new JPanel();
GridLayout messagePanelLayout = new GridLayout(2,0);
messagePanel.setLayout(messagePanelLayout);
messagePanel.add(calculate);
contentPane.add(messagePanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(X_ORIGIN, Y_ORIGIN, WIDTH, HEIGHT);
setResizable(false);
}
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
int pizzaSiz = (int)pizzaSize.getSelectedIndex();
if (source == calculate){
if (pizzaSiz == smallPizzaSize){
pizzaSizePrice = smallPizzaPrice;
}
else if (pizzaSiz == mediumPizzaSize){
pizzaSizePrice = mediumPizzaPrice ;
}
else if (pizzaSiz == largePizzaSize){
pizzaSizePrice = largePizzaPrice;
}
else if (pizzaSiz == extraLargeSize){
pizzaSizePrice = extraLargePizzaPrice;
}
int pizzaTop = (int)pizzaTopping.getSelectedIndex();
if(pizzaTop == cheesePlace ){
toppingPrice = cheese;
}
else if(pizzaTop == pepperoniPlace){
toppingPrice = pepperoni;
}
else if(pizzaTop == peppersPlace){
toppingPrice = peppers;
}
else if(pizzaTop == sausagePlace){
toppingPrice = sausage;
}
else if(pizzaTop == olivesPlace){
toppingPrice = olives;
}
totalPrice = pizzaSizePrice;
totalPrice +=toppingPrice;
calculate.setText("Total Price: $" + totalPrice);
}
}
}
import java.awt.*;
导入javax.swing.*;
导入java.awt.event.*;
类JPizza扩展JFrame实现ActionListener
{
私有静态最终长serialVersionUID=1L;
公共静态void main(字符串[]args)
{
JPizza myFrame=新的JPizza();
myFrame.setVisible(true);
}
专用静态最终整数宽度=250;
专用静态最终内部高度=300;
专用静态最终整数X_原点=200;
专用静态最终整数Y_原点=100;
私人静态最终双倍小比萨饼价格=7.00;
私人静态最终双mediumPizzaPrice=9.00;
私人静态最终双倍大比萨饼价格=11.00;
私人静态最终双倍超大比萨饼价格=14.00;
私有静态最终int smallPizzaSize=0;
私有静态最终int mediumPizzaSize=1;
私有静态最终int largePizzaSize=2;
私有静态最终int extragragesize=3;
私人静态最终双奶酪=0.0,辣香肠=1.00,辣椒=1.00,香肠=1.00,橄榄=1.00;
私人静态最终int cheesePlace=0,pepperoniPlace=1,peppersPlace=2,sausagePlace=3,olivesPlace=4;
int状态=0;
双倍总价=0.0;
双比萨价格=小比萨价格;
双顶价格=0.0;
//浇头和面板
JComboBox比萨饼;
JPanel ComboxPanel2;
//比萨饼尺寸和面板
JComboBox比萨饼尺寸;
JPanel ComboxPanel;
//价格显示字段和面板
JTextField计算;
JPanel消息面板;
公共JPizza()
{
超级(“比萨塔”);
JLabel title=新JLabel(“比萨塔”);
增加(标题);
pizzaSize=新的JComboBox();
Pizzazize.addItem(“小”);
比萨大小。附加(“中等”);
Pizzazize.addItem(“大”);
Pizzazize.addItem(“超大”);
Pizzazize.setSelectedIndex(0);
pizzaSize.addActionListener(这个);
pizzaTopping=新的JComboBox();
比萨面加配料(“奶酪”);
比萨馅饼;意大利香肠;
比萨配料。添加(“辣椒”);
比萨馅饼面加配料(“香肠”);
比萨馅饼(橄榄);
pizzaTopping.setSelectedIndex(0);
pizzaTopping.addActionListener(这个);
计算=新的JTextField(10);
calculate.addActionListener(这个);
容器contentPane=getContentPane();
GridLayout contentpaneLayout=新的GridLayout(5,0,10,10);
contentPane.setLayout(contentpaneLayout);
comboboxPanel=newJPanel();
GridLayout ComboxPanelLayout=新的GridLayout(2,0);
setLayout(comboboxPanelLayout);
comboboxPanel.add(比萨饼大小);
添加(comboboxPanel);
comboboxPanel2=新的JPanel();
GridLayout ComboxPanelLayout1=新的GridLayout(2,0);
comboboxPanel2.setLayout(comboboxPanelLayout1);
comboboxPanel2.添加(比萨饼面);
添加(comboboxPanel2);
messagePanel=newjpanel();
GridLayout messagePanelLayout=新的GridLayout(2,0);
messagePanel.setLayout(messagePanelLayout);
messagePanel.add(计算);
contentPane.add(messagePanel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
立根(X_原点、Y_原点、宽度、高度);
可设置大小(假);
}
已执行的公共无效操作(操作事件e)
{
对象源=e.getSource();
int pizzaSiz=(int)pizzaSize.getSelectedIndex();
如果(源==计算){
如果(pizzaSiz==smallPizzaSize){
比萨价格=小比萨价格;
}
else if(pizzaSiz==mediumpizzazize){
pizzaSizePrice=中等价格;
}
else if(pizzaSiz==largePizzaSize){
比萨价格=大比萨价格;
}
else if(比萨=超值){
比萨价格=超大比萨价格;
}
int pizzaTop=(int)pizzaTopping.getSelectedIndex();
如果(比萨顶==奶酪地){
最高价格=奶酪;
}
else if(pizzaTop==pepperoniPlace){
最高价格=意大利香肠;
}
else if(pizzaTop==peppersPlace){
最高价格=辣椒;
}
else if(pizzaTop==香肠店){
最高价格=香肠;
}
else if(pizzaTop==olivesPlace){
最高价格=橄榄;
}
总价=比萨价格;
总价+=最高价格;
calculate.setText(“总价:$”+总价);
}
}
}
您通过限制actionPerformed对if测试所做的操作,有目的地限制您的代码:
if (source == calculate){
去掉它,该方法将在调用它时执行计算。在尝试计算之前,最好确保两个组合框都有有效的选择。您可以通过获取组合框的选定索引并测试它们是否>=0(而不是-1)来测试它们。欢迎使用Stackoverflow!没有必要在你的问题中加入标签