如何从文本字段获取值?
我正在创建一个可以添加和删除项目的程序。添加后,我希望在单击 ADD
按钮时,TOTAL
面板从 itemprice_textfield
获取值。
private JFrame frame;
private JTextField itemname_textfield;
private JTextField itemprice_textfield;
private JButton add_button;
private JComboBox comboBox;
private JButton del_button;
private JLabel itemprice_label;
private JLabel itemname_label;
private JLabel lblNewLabel_3;
private JLabel totalamount_label;
private JTextField textField_2;
private double amount;
private JLabel bigger_itemname_label;
private JLabel bigger_itemprice_label;
private ArrayList <String> itemnames = new ArrayList();
private ArrayList <Double> itemprices = new ArrayList();
private JTable table;
//DefaultTableModel dtm;
//String header [] = new String [] {itemname_textfield, itemprice_textfield};
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
EntapaCCE103LabExam1_Frame1 window = new EntapaCCE103LabExam1_Frame1();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public class lists{ // user defined method lists class
public String itemname;
public double price;
public lists(String itemname, double price)
{
this.itemname = itemname;
this.price = price;
}
public lists(JTextField textField) {
// TODO Auto-generated constructor stub
}
public lists(JTextField textField, JTextField textField_1) {
// TODO Auto-generated constructor stub
}
} // end
public EntapaCCE103LabExam1_Frame1() {
initialize();
}
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 600, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.getContentPane().setLayout(null);
JLabel big_title = new JLabel("MY ORDERS");
big_title.setFont(new Font("Times New Roman", Font.PLAIN, 18));
big_title.setBounds(245, 11, 116, 52);
frame.getContentPane().add(big_title);
itemname_textfield = new JTextField(10); // name text
itemname_textfield.setBounds(412, 268, 109, 20);
frame.getContentPane().add(itemname_textfield);
itemname_textfield.setColumns(10);
itemprice_textfield = new JTextField(); // price text
itemprice_textfield.setBounds(412, 330, 109, 20);
frame.getContentPane().add(itemprice_textfield);
itemprice_textfield.setColumns(10);
add_button = new JButton("ADD ITEM");
add_button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String getname = itemname_textfield.getText(); // used to get the input string from user to transfer to the combo box
comboBox.addItem(getname); // used to display the received string inputs
}
});
add_button.setFont(new Font("Serif", Font.PLAIN, 13));
add_button.setBounds(412, 361, 109, 23);
frame.getContentPane().add(add_button);
comboBox = new JComboBox();
comboBox.setBounds(412, 479, 109, 22);
frame.getContentPane().add(comboBox);
del_button = new JButton("DELETE ITEM");
del_button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
comboBox.removeItem(comboBox.getSelectedItem()); // used to delete the selected index in combo box.
}
});
del_button.setFont(new Font("Serif", Font.PLAIN, 11));
del_button.setBounds(412, 512, 109, 23);
frame.getContentPane().add(del_button);
itemprice_label = new JLabel("Enter Item Price:"); // label for item price
itemprice_label.setBounds(412, 311, 109, 14);
frame.getContentPane().add(itemprice_label); // used to display the text from label
itemname_label = new JLabel("Enter Item Name:"); // label for item name
itemname_label.setBounds(412, 249, 102, 14);
frame.getContentPane().add(itemname_label); // used to display the text from label
lblNewLabel_3 = new JLabel("OPERATION");
lblNewLabel_3.setFont(new Font("Sitka Subheading", Font.PLAIN, 17));
lblNewLabel_3.setBounds(419, 185, 102, 32);
frame.getContentPane().add(lblNewLabel_3);
String getname = itemname_textfield.getText();
totalamount_label = new JLabel("TOTAL: " + amount); // amount here
totalamount_label.setFont(new Font("Serif", Font.PLAIN, 13));
totalamount_label.setBounds(412, 130, 136, 20);
frame.getContentPane().add(totalamount_label);
bigger_itemname_label = new JLabel("ITEM NAME");
bigger_itemname_label.setFont(new Font("Serif", Font.PLAIN, 14));
bigger_itemname_label.setBounds(84, 190, 96, 14);
frame.getContentPane().add(bigger_itemname_label);
bigger_itemprice_label = new JLabel("PRICE");
bigger_itemprice_label.setFont(new Font("Serif", Font.PLAIN, 14));
bigger_itemprice_label.setBounds(245, 192, 46, 14);
frame.getContentPane().add(bigger_itemprice_label);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(39, 225, 322, 285);
frame.getContentPane().add(scrollPane);
table = new JTable();
scrollPane.setViewportView(table);
table.setBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null));
}
}
但我不知道该怎么做或做什么,因为我是 Java GUI 的新手。
另外,如果我的代码中有什么奇怪的地方,请告诉我,以便我进行改进。
I am creating a program where I can add and delete items. When added, I want the TOTAL
panel to get values from itemprice_textfield
when the button ADD
is clicked.
private JFrame frame;
private JTextField itemname_textfield;
private JTextField itemprice_textfield;
private JButton add_button;
private JComboBox comboBox;
private JButton del_button;
private JLabel itemprice_label;
private JLabel itemname_label;
private JLabel lblNewLabel_3;
private JLabel totalamount_label;
private JTextField textField_2;
private double amount;
private JLabel bigger_itemname_label;
private JLabel bigger_itemprice_label;
private ArrayList <String> itemnames = new ArrayList();
private ArrayList <Double> itemprices = new ArrayList();
private JTable table;
//DefaultTableModel dtm;
//String header [] = new String [] {itemname_textfield, itemprice_textfield};
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
EntapaCCE103LabExam1_Frame1 window = new EntapaCCE103LabExam1_Frame1();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public class lists{ // user defined method lists class
public String itemname;
public double price;
public lists(String itemname, double price)
{
this.itemname = itemname;
this.price = price;
}
public lists(JTextField textField) {
// TODO Auto-generated constructor stub
}
public lists(JTextField textField, JTextField textField_1) {
// TODO Auto-generated constructor stub
}
} // end
public EntapaCCE103LabExam1_Frame1() {
initialize();
}
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 600, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.getContentPane().setLayout(null);
JLabel big_title = new JLabel("MY ORDERS");
big_title.setFont(new Font("Times New Roman", Font.PLAIN, 18));
big_title.setBounds(245, 11, 116, 52);
frame.getContentPane().add(big_title);
itemname_textfield = new JTextField(10); // name text
itemname_textfield.setBounds(412, 268, 109, 20);
frame.getContentPane().add(itemname_textfield);
itemname_textfield.setColumns(10);
itemprice_textfield = new JTextField(); // price text
itemprice_textfield.setBounds(412, 330, 109, 20);
frame.getContentPane().add(itemprice_textfield);
itemprice_textfield.setColumns(10);
add_button = new JButton("ADD ITEM");
add_button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String getname = itemname_textfield.getText(); // used to get the input string from user to transfer to the combo box
comboBox.addItem(getname); // used to display the received string inputs
}
});
add_button.setFont(new Font("Serif", Font.PLAIN, 13));
add_button.setBounds(412, 361, 109, 23);
frame.getContentPane().add(add_button);
comboBox = new JComboBox();
comboBox.setBounds(412, 479, 109, 22);
frame.getContentPane().add(comboBox);
del_button = new JButton("DELETE ITEM");
del_button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
comboBox.removeItem(comboBox.getSelectedItem()); // used to delete the selected index in combo box.
}
});
del_button.setFont(new Font("Serif", Font.PLAIN, 11));
del_button.setBounds(412, 512, 109, 23);
frame.getContentPane().add(del_button);
itemprice_label = new JLabel("Enter Item Price:"); // label for item price
itemprice_label.setBounds(412, 311, 109, 14);
frame.getContentPane().add(itemprice_label); // used to display the text from label
itemname_label = new JLabel("Enter Item Name:"); // label for item name
itemname_label.setBounds(412, 249, 102, 14);
frame.getContentPane().add(itemname_label); // used to display the text from label
lblNewLabel_3 = new JLabel("OPERATION");
lblNewLabel_3.setFont(new Font("Sitka Subheading", Font.PLAIN, 17));
lblNewLabel_3.setBounds(419, 185, 102, 32);
frame.getContentPane().add(lblNewLabel_3);
String getname = itemname_textfield.getText();
totalamount_label = new JLabel("TOTAL: " + amount); // amount here
totalamount_label.setFont(new Font("Serif", Font.PLAIN, 13));
totalamount_label.setBounds(412, 130, 136, 20);
frame.getContentPane().add(totalamount_label);
bigger_itemname_label = new JLabel("ITEM NAME");
bigger_itemname_label.setFont(new Font("Serif", Font.PLAIN, 14));
bigger_itemname_label.setBounds(84, 190, 96, 14);
frame.getContentPane().add(bigger_itemname_label);
bigger_itemprice_label = new JLabel("PRICE");
bigger_itemprice_label.setFont(new Font("Serif", Font.PLAIN, 14));
bigger_itemprice_label.setBounds(245, 192, 46, 14);
frame.getContentPane().add(bigger_itemprice_label);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(39, 225, 322, 285);
frame.getContentPane().add(scrollPane);
table = new JTable();
scrollPane.setViewportView(table);
table.setBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null));
}
}
But I don't know how or what to do since I am new to Java GUI.
Also, please tell me if there's something weird in my code so that I can make improvement.
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