我遇到的问题是JFrame没有显示添加到它的JTable.我试过getContentPane().add(..),我已经切换到只是添加以保持代码更短.任何帮助都非常感谢！
package com.embah.Accgui;
import java.awt.*;
import javax.swing.*;
public class accCreator extends JFrame {
private String[] columnNames = {"Username", "Password", "Members", "World"};
private Object[][] data = {{"b", "b", "b", "b"},
{ "e", "e", "e", "e"}};
private JTable tbl_Accounts;
private JScrollPane scrollPane;
private JLabel lbl_Account = new JLabel();
private JLabel lbl_Username = new JLabel();
private JLabel lbl_Password = new JLabel();
private JLabel lbl_Homeworld = new JLabel();
private JButton btn_Select = new JButton();
private JButton btn_Addacc = new JButton();
private JButton btn_Delacc = new JButton();
private JTextArea txt_Username = new JTextArea();
private JTextArea txt_Password = new JTextArea();
private JTextArea txt_Homeworld = new JTextArea();
private JCheckBox cbox_Members = new JCheckBox();
private JCheckBox cbox_RanWrld = new JCheckBox();
public accCreator() {
setLayout(null);
setupGUI();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void setupGUI() {
tbl_Accounts = new JTable(data, columnNames);
tbl_Accounts.setLocation(5, 30);
tbl_Accounts.setPreferredScrollableViewportSize(new Dimension(420, 250));
tbl_Accounts.setFillsViewportHeight(true);
tbl_Accounts.setVisible(true);
add(tbl_Accounts);
scrollPane = new JScrollPane(tbl_Accounts);
add(scrollPane);
lbl_Account.setLocation(4, 5);
lbl_Account.setSize(100, 20);
lbl_Account.setText("Select Account:");
add(lbl_Account);
lbl_Username.setLocation(5, 285);
lbl_Username.setSize(70, 20);
lbl_Username.setText("Username:");
add(lbl_Username);
lbl_Password.setLocation(5, 310);
lbl_Password.setSize(70, 20);
lbl_Password.setText("Password:");
add(lbl_Password);
lbl_Homeworld.setLocation(310, 310);
lbl_Homeworld.setSize(80, 20);
lbl_Homeworld.setText("Home World:");
add(lbl_Homeworld);
btn_Select.setLocation(305, 5);
btn_Select.setSize(120, 20);
btn_Select.setText("Select Account");
add(btn_Select);
btn_Addacc.setLocation(300, 285);
btn_Addacc.setSize(60, 20);
btn_Addacc.setText("Add");
btn_Addacc.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent arg0) {
String worldSel = "";
if(cbox_RanWrld.isSelected()){
worldSel = "Random";
} else {
worldSel = txt_Homeworld.getText();
}
Object[] row = {txt_Username.getText(), txt_Password.getText(), cbox_Members.isSelected(), worldSel};
DefaultTableModel model = (DefaultTableModel) tbl_Accounts.getModel();
model.addRow(row);
}
});
add(btn_Addacc);
btn_Delacc.setLocation(365, 285);
btn_Delacc.setSize(60, 20);
btn_Delacc.setText("Del");
btn_Delacc.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent arg0) {
DefaultTableModel model = (DefaultTableModel) tbl_Accounts.getModel();
}
});
add(btn_Delacc);
txt_Username.setLocation(80, 285);
txt_Username.setSize(100, 20);
txt_Username.setText("");
txt_Username.setRows(5);
txt_Username.setColumns(5);
add(txt_Username);
txt_Password.setLocation(80, 310);
txt_Password.setSize(100, 20);
txt_Password.setText("");
txt_Password.setRows(5);
txt_Password.setColumns(5);
txt_Password.setTabSize(0);
add(txt_Password);
txt_Homeworld.setLocation(395, 310);
txt_Homeworld.setSize(30, 20);
txt_Homeworld.setText("82");
txt_Homeworld.setRows(5);
txt_Homeworld.setColumns(5);
txt_Homeworld.setTabSize(0);
add(txt_Homeworld);
cbox_Members.setLocation(185, 285);
cbox_Members.setSize(80, 20);
cbox_Members.setText("Members");
cbox_Members.setSelected(false);
add(cbox_Members);
cbox_RanWrld.setLocation(185, 310);
cbox_RanWrld.setSize(115, 20);
cbox_RanWrld.setText("Random World");
cbox_RanWrld.setSelected(false);
add(cbox_RanWrld);
setTitle("Account Manager");
setSize(440, 370);
setVisible(true);
setResizable(false);
}
public static void main(String args[]) {
new accCreator();
}
}
解决方法:
I know thats not the problem tho because everything else shows up just fine
真的吗？不在我的电脑里……
让我们看一下我PC上显示的实际GUI：
GUI在您的计算机中看起来是否相同？我打赌不.
但是……为什么它在我的电脑里看起来像那样？
好吧,正如上面@MadProgrammer的评论所述,这是因为setLayout(null);线.您可能需要阅读Null layout is evil和Why is it frowned upon to use a null layout in Java Swing?以获取更多信息.
现在,话虽如此,您还应该阅读并学习如何使用各种layout managers来创建复杂的GUI.
在您的代码中,您永远不会设置scrollPane的位置/边界及其大小,因此该组件的默认大小为0,0.
但是……我认为最好向您展示如何获得一个非常相似的GUI(我很匆忙所以我没有制作更相似的GUI).您可以复制粘贴我的代码并查看相同的输出(由于操作系统可能略有不同),但不会裁剪文本.
产生上述图像的代码是这样的：
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridLayout;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class AccountCreator {
private JFrame frame;
private JPanel mainPane;
private JPanel topPane;
private JPanel tablePane;
private JPanel bottomPane;
private JLabel selectAccountLabel;
private JLabel userNameLabel;
private JLabel passwordLabel;
private JLabel homeWorldLabel;
private JTextField userNameField;
private JTextField homeWorldField;
private JPasswordField passwordField;
private JCheckBox membersBox;
private JCheckBox randomBox;
private JButton selectAccountButton;
private JButton addButton;
private JButton deleteButton;
private JTable table;
private JScrollPane scroll;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new AccountCreator().createAndShowGui();
}
});
}
public void createAndShowGui() {
frame = new JFrame(getClass().getSimpleName());
int rows = 30;
int cols = 3;
String[][] data = new String[rows][cols];
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
data[i][j] = i + "-" + j;
}
}
String[] columnNames = { "Column1", "Column2", "Column3" };
table = new JTable(data, columnNames);
scroll = new JScrollPane(table, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
table.setPreferredScrollableViewportSize(new Dimension(420, 250));
table.setFillsViewportHeight(true);
selectAccountLabel = new JLabel("Select Account");
userNameLabel = new JLabel("Username: ");
passwordLabel = new JLabel("Password: ");
homeWorldLabel = new JLabel("Home world");
selectAccountButton = new JButton("Select Account");
addButton = new JButton("Add");
deleteButton = new JButton("Del");
userNameField = new JTextField(10);
passwordField = new JPasswordField(10);
homeWorldField = new JTextField(3);
membersBox = new JCheckBox("Members");
randomBox = new JCheckBox("Random world");
topPane = new JPanel();
topPane.setLayout(new BorderLayout());
topPane.add(selectAccountLabel, BorderLayout.WEST);
topPane.add(selectAccountButton, BorderLayout.EAST);
tablePane = new JPanel();
tablePane.add(scroll);
bottomPane = new JPanel();
bottomPane.setLayout(new GridLayout(0, 5, 3, 3));
bottomPane.add(userNameLabel);
bottomPane.add(userNameField);
bottomPane.add(membersBox);
bottomPane.add(addButton);
bottomPane.add(deleteButton);
bottomPane.add(passwordLabel);
bottomPane.add(passwordField);
bottomPane.add(randomBox);
bottomPane.add(homeWorldLabel);
bottomPane.add(homeWorldField);
mainPane = new JPanel();
mainPane.setLayout(new BoxLayout(mainPane, BoxLayout.PAGE_AXIS));
frame.add(topPane, BorderLayout.NORTH);
frame.add(tablePane, BorderLayout.CENTER);
frame.add(bottomPane, BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
另外,您可能已经注意到main()方法不同,其中的代码是将程序放在Event Dispatch Thread (EDT)上.
因此,请务必将其包含在您未来的计划中
标签：java,swing,jtable,jframe 来源： https://codeday.me/bug/20190916/1806521.html
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