我正在制作一个商店程序，当我单击其中一个复选框时(这应该会更改成本值并更改 JLabel 的值)，但相反，所有复选框和图片都转到底部有 JLabel
我尝试过更改字体、大小、位置，但它总是停留在同一个位置
import java.awt.*;
import java.net.URL;
import java.util.ArrayList;
import javax.swing.*;
public class Main extends JFrame{
public static void main(String[] args) throws Exception{
JFrame f = new JFrame("Shop");
f.setExtendedState(JFrame.MAXIMIZED_BOTH);
String loc1;
JButton button;
JCheckBox q1;
JCheckBox q2;
JCheckBox q3;
JCheckBox q4;
JCheckBox q5;
float xboxP = (float) 399.00;
float ipadP = (float) 1299.00;
float ps4P = (float) 399.99;
float nintendoP = (float) 299.99;
float pcP = (float) 750.00;
float cost = 0;
String totalC;
ArrayList items = new ArrayList();
JPanel p = new JPanel();
button = new JButton("Done");
//(x,y,width,length)
button.setBounds(0, 560, 100, 50);
f.add(button);
q1 = new JCheckBox("XBOX");
q1.setBounds(0,0,100,20);
f.add(q1);
URL url1 = Main.class.getResource(
"/pictures/XBOX.png");
ImageIcon icon1 = new ImageIcon(url1);
JLabel l1 = new JLabel(icon1);
l1.setBounds(100,100,100,100);
f.add(l1);
l1.setBounds(100,0,100,100);
f.add(l1);
q2 = new JCheckBox("IPad");
q2.setBounds(0, 100, 50, 30);
f.add(q2);
URL url2 = Main.class.getResource(
"/pictures/IPAD.png");
ImageIcon icon2 = new ImageIcon(url2);
JLabel l2 = new JLabel(icon2);
l2.setBounds(100,100,100,100);
f.add(l2);
q3 = new JCheckBox("PS4");
q3.setBounds(0, 200, 50, 30);
f.add(q3);
URL url3 = Main.class.getResource(
"/pictures/PS4.png");
ImageIcon icon3 = new ImageIcon(url3);
JLabel l3 = new JLabel(icon3);
l3.setBounds(100,200,100,100);
f.add(l3);
q4 = new JCheckBox("Nintendo Switch");
q4.setBounds(0, 300, 150, 30);
f.add(q4);
URL url4 = Main.class.getResource(
"/pictures/Nintendo Switch.png");
ImageIcon icon4 = new ImageIcon(url4);
JLabel l4 = new JLabel(icon4);
l4.setBounds(0,300,150,150);
f.add(l4);
q5 = new JCheckBox("Gaming PC");
q5.setBounds(0, 400, 100, 30);
f.add(q5);
URL url5 = Main.class.getResource(
"/pictures/Gaming PC.png");
ImageIcon icon5 = new ImageIcon(url5);
JLabel l5 = new JLabel(icon5);
l5.setBounds(0,420,100,100);
f.add(l5);
p.setLayout(null);
JCheckBox box1 = new JCheckBox();
f.add(p);
// setLayout(null);
f.pack();
f.setDefaultCloseOperation(3);
f.setSize(700, 650);
f.setVisible(true);
q1.addActionListener(null);
//Button j;
JLabel price = new JLabel("Cost:$0");
price.setBounds(0, 500, 10, 10);
//Border border = BorderFactory.createLineBorder(Color.BLACK, 5);
//price.setBorder(border);
price.setFont(new Font("Serif", Font.PLAIN, 10));
f.setLocation(0,500);
f.add(price);
f.setForeground(Color.BLACK);
//f.setBackground(Color.WHITE);
price.setOpaque(true);
f.repaint();
while (true) {
StringBuilder sb = new StringBuilder();
sb.append("");
sb.append(cost);
String strI = sb.toString();
totalC= "Cost:$"+strI;
price.setText(totalC);
f.add(price);
f.validate();
boolean q1s = q1.isSelected();
boolean q2s = q2.isSelected();
boolean q3s = q3.isSelected();
boolean q4s = q4.isSelected();
boolean q5s = q5.isSelected();
//Question 1
if (q1s==true) {
if(items.contains("xbox")) {
cost = cost;
}
else {
cost=cost+xboxP;
items.add("xbox");
}
}
if (q1s==false) {
if(items.contains("xbox")) {
cost = cost;
}
if(items.contains("xbox")) {
items.remove("xbox");
cost = cost-xboxP;
}
else {
cost=cost;
}
}
//Question 2
if (q2s == true) {
if(items.contains("ipad")) {
cost = cost;
}
else {
cost = cost+ipadP;
items.add("ipad");
}
}
if (q2s == false) {
if(items.contains("ipad")) {
items.remove("ipad");
cost = cost-ipadP;
}
else {
cost = cost;
}
}
//Question 3
if (q3s == true) {
if(items.contains("ps4")) {
cost = cost;
}
else {
cost = cost+ipadP;
items.add("ps4");
}
}
if (q3s == false) {
if(items.contains("ps4")) {
items.remove("ps4");
cost = cost-ps4P;
}
else {
cost = cost;
}
}
//Question 4
if (q4s == true) {
if(items.contains("nintendo")) {
cost = cost;
}
else {
cost = cost+nintendoP;
items.add("nintendo");
}
}
if (q4s == false) {
if(items.contains("nintendo")) {
items.remove("nintendo");
cost = cost-nintendoP;
}
else {
cost = cost;
}
}
//Question 5
if (q5s == true) {
if(items.contains("pc")) {
cost = cost;
}
else {
cost = cost+pcP;
items.add("pc");
}
}
if (q5s == false) {
if(items.contains("pc")) {
items.remove("pc");
cost = cost-pcP;
}
else {
cost = cost;
}
}
}
}
}
我希望底部有一个标签显示总成本。 感谢您提前检查。
最佳答案
避免使用空布局并手动设置边界。使用Layout managers为您布局(设置边界)。
解决复杂计算任务的常见策略是将其分解为小的、定义良好的可管理任务。分而治之。
这也适用于 gui:将设计分解为小的、易于布局的容器。从简单的事情开始，并以此为基础:
import java.awt.GridLayout;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class Main extends JFrame{
public static void main(String[] args) throws Exception{
URL[] urls = { //when posting, always use web resources to make your code mcve
new URL("https://findicons.com/files/icons/345/summer/128/cake.png"),
new URL("http://icons.iconarchive.com/icons/atyourservice/service-categories/128/Sweets-icon.png"),
};
JFrame f = new JFrame("Shop");
f.setDefaultCloseOperation(EXIT_ON_CLOSE);
//JFrame content pane uses a BorderLayout by default.
//to change it:
f.setLayout(new GridLayout(0,1));
JPanel panel1 = new JPanel();// uses FlowLayout by default
JCheckBox q1 = new JCheckBox("CAKE");
panel1.add(q1); //add components to the sub panel
ImageIcon icon1 = new ImageIcon(urls[0]);
JLabel l1 = new JLabel(icon1);
panel1.add(l1);
f.add(panel1); //add sub panel to main panel
JPanel panel2 = new JPanel();
JCheckBox q2 = new JCheckBox("ICE CREAM");
panel2.add(q2);
ImageIcon icon2 = new ImageIcon(urls[1]);
JLabel l2 = new JLabel(icon2);
panel2.add(l2);
f.add(panel2);
f.pack();
f.setVisible(true);
}
}
关于java - JCheckBox下的JLabel，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53893216/