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대학 과정에서 JPanel 과제를 수행하고 있으며 최종 출력에 문제가 있습니다. 패널 자체가 멋지게 보이지만 모든 것을 할 수없는 유일한 방법은 인쇄 할 줄을 표시하는 것입니다.(자바) JPanel 인쇄되지 않음
이름, 가격, 카테고리 및 수량이 모두 사용자가 입력하는 식료품 품목의 입력을 받도록 고안되었습니다. '장바구니에 추가'버튼을 클릭하면 이전에 입력 한 모든 정보가 표시됩니다.하지만 지금은 그렇지 않습니다.
여기 내가 사용 두 클래스의 :
MyCart.java
package assignment2;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
public class MyCart extends JFrame {
private JPanel display;
private JLabel itemLabel;
private JTextField item;
private JLabel catLabel;
private JComboBox category;
private JLabel quanLabel;
private JTextField quantity;
private JLabel priceLabel;
private JTextField price;
private JPanel btns;
private JButton addBtn;
private JButton exitBtn;
private JPanel list;
private JList myList;
private ArrayList<Item> itemList;
public MyCart() {
itemList = new ArrayList();
myList = new JList(itemList.toArray());
this.setLayout(new GridLayout(2,1,5,5));
display = new JPanel();
display.setLayout(new GridLayout(5,2,5,5));
itemLabel = new JLabel(" Item: ");
item = new JTextField(10);
catLabel = new JLabel(" Category: ");
category = new JComboBox(new String[]{"Meat", "Fruit/Vegetable", "Dairy", "Grains", "Sweets", "Other"});
quanLabel = new JLabel(" Quantity: ");
quantity = new JTextField(10);
priceLabel = new JLabel(" Price: ");
price = new JTextField(10);
display.add(itemLabel);
display.add(item);
display.add(catLabel);
display.add(category);
display.add(quanLabel);
display.add(quantity);
display.add(priceLabel);
display.add(price);
this.add(display);
btns = new JPanel();
btns.setLayout(new GridLayout(1,3,5,5));
addBtn = new JButton("Add to Cart");
exitBtn = new JButton("Exit");
btns.add(addBtn);
btns.add(exitBtn);
this.add(btns);
list = new JPanel();
list.setLayout(new FlowLayout());
list.add(new JLabel("My Cart:"));
JScrollPane myScrollPane = new JScrollPane(myList);
list.add(myScrollPane);
setLayout(new BorderLayout());
this.add(display,BorderLayout.NORTH);
this.add(btns,BorderLayout.CENTER);
this.add(list,BorderLayout.SOUTH);
//event listener object created
ButtonListeners buttonListener = new ButtonListeners();
addBtn.addActionListener(buttonListener);
exitBtn.addActionListener(buttonListener);
}
public static void main(String[] args) {
MyCart cart = new MyCart();
cart.setTitle("Cart <Adam>");
cart.setSize(400,350);
cart.setLocationRelativeTo(null);
cart.setVisible(true);
cart.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//event listener class for adding
class ButtonListeners implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
switch(e.getActionCommand()) {
case "Add": String n = item.getText();
String c = category.getSelectedItem().toString();
double q = Double.valueOf(quantity.getText());
double p = Double.valueOf(price.getText());
Item myItem = new Item();
myItem.setName(n);
myItem.setCategory(c);
myItem.setQuantity(q);
myItem.setPrice(p);
itemList.add(myItem);
myList.setListData(itemList.toArray());
break;
case "Exit": System.exit(0);
}
}
}
//exit listener
class ExitListener implements ActionListener{
@Override
public void actionPerformed(ActionEvent e){
System.exit(0);
}
}
}
Item.java
package assignment2;
public class Item {
private String name;
private String category;
private double price;
private double quantity;
public Item(String name, String category, double price, double quantity) {
}
public Item() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public double getQuantity() {
return quantity;
}
public void setQuantity(double quantity) {
this.quantity = quantity;
}
public double calcAmount() {
return quantity * price;
}
public String toString(){
return(name + ", " + category + ", " + quantity + ", " + price + ", " + calcAmount());
}
}
+1을, 조치 명령. – camickr
고마워, 친구! :) – CSRadical
@CSRadical 당신은 환영합니다 :)). –