如何 把一个JFrame 在一被打开的时候 变成全屏显示？

Question

yourframename.setSize(frame.getToolkit().getDefaultToolkit().getScreenSize());

Answer 1

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
yourFrame.setBounds(0,0,screenSize.width,screenSize.height);

Answer 2

为什么效果 和我使用this.setLocation(0, 0);        一样呢？

Answer 3

setBounds(xPos,yPos,width,height)这是其中参数的定义，前面是窗口的位置，以下有段代码，可以稍微修改一下：import javax.swing.*;
import java.awt.*;public class CentralFrame extends JFrame{
public CentralFrame(){
Dimension d=Toolkit.getDefaultToolkit().getScreenSize();
setBounds((d.width-d.width/2)/2,(d.height-d.height/2)/2,d.width/2,d.height/2);
setVisible(true);
}
public static void main(String[] args){
CentralFrame frame=new CentralFrame();
}
}

Answer 4

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class ClientUser extends JFrame implements ActionListener
{
private JPanel contentPane;
private JPanel jPanel1 = new JPanel();
private JPanel jPanel2 = new JPanel();
private JScrollPane jScrollPane1 = new JScrollPane(); private JMenuBar mnuBar = new JMenuBar();
private JMenu mnuFile = new JMenu("File");
private JMenuItem mnuFileQuit = new JMenuItem ("Exit"); private JMenu mnuHelp = new JMenu("Help");
private JTable jTable1 = new JTable();
private JComboBox jComboBox1 = new JComboBox();
private JComboBox jComboBox2 = new JComboBox();
private JLabel startLabel = new JLabel();
private JLabel endLabel = new JLabel();
private JPanel jPanel3 = new JPanel();
private JTextField ticketText = new JTextField();
private JLabel orderLabel = new JLabel();
private BorderLayout borderLayout1 = new BorderLayout();
private JButton showButton = new JButton();
private JButton orderButton = new JButton();
private JButton exitButton = new JButton();
private GridBagLayout gridBagLayout1 = new GridBagLayout();
private GridBagLayout gridBagLayout2 = new GridBagLayout();
private GridBagLayout gridBagLayout3 = new GridBagLayout(); String[]  columnName= {"Flight number", "Origin airport", "Destination airport", "Carrier", "Price", "Day",
"Time", "Duration","Available seats"};
QxbirdTableModel tableModel;
public ClientUser()
{
//setSelectStation();
//setShowTable(); contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(800,400));
this.setTitle("Frame Title");
jPanel1.setBackground(Color.orange);
jPanel1.setBorder(BorderFactory.createLoweredBevelBorder());
jPanel1.setLayout(gridBagLayout3);
jPanel2.setBackground(Color.orange);
jPanel2.setBorder(BorderFactory.createLoweredBevelBorder());
jPanel2.setLayout(gridBagLayout1);
startLabel.setText("Departure Station");
endLabel.setText("Destination Station");
jPanel3.setBackground(Color.orange);
jPanel3.setBorder(BorderFactory.createEtchedBorder());
jPanel3.setLayout(gridBagLayout2);
orderLabel.setText("Order The Ticket  Here");
showButton.setText("Search");
orderButton.setText("Order");
orderButton.addActionListener(this);
exitButton.setText("Exit System");
exitButton.addActionListener(this); mnuFileQuit.addActionListener(this);
mnuFile.add(mnuFileQuit);
mnuBar.add(mnuFile);
        this.setJMenuBar( mnuBar ); contentPane.add(jPanel1, BorderLayout.CENTER);
jPanel1.add(jScrollPane1,  new GridBagConstraints(0, 0, 1, 1, 1.0, 1.0
,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 559, 393));
contentPane.add(jPanel2, BorderLayout.WEST);
jPanel2.add(jPanel3,  new GridBagConstraints(0, 5, 1, 1, 1.0, 1.0
,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(8, 2, 0, 0), 10, 8));
jPanel3.add(orderButton,  new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(11, 124, 5, 10), 20, -2));
jPanel3.add(orderLabel,  new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(21, 76, 0, 10), 11, 18));
jPanel3.add(ticketText,  new GridBagConstraints(0, 1, 1, 1, 1.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 64, 0, 10), 143, 0));
jPanel2.add(startLabel,  new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 116, 0, 8), 9, 9));
jPanel2.add(endLabel,  new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 104, 0, 12), 9, 9));
jPanel2.add(jComboBox1,  new GridBagConstraints(0, 1, 1, 1, 1.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 20, 0, 7), 73, 0));
jPanel2.add(showButton,  new GridBagConstraints(0, 4, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(19, 132, 0, 10), 34, -2));
jPanel2.add(jComboBox2,  new GridBagConstraints(0, 3, 1, 1, 1.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 20, 0, 9), 71, 0));
jPanel2.add(exitButton,  new GridBagConstraints(0, 6, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(80, 55, 5, 58), 17, -2)); Dimension screenRect = Toolkit.getDefaultToolkit().getScreenSize();
int centerWidth = screenRect.width < this.getSize().width ?
screenRect.width : screenRect.width/2 - this.getSize().width/2;
int centerHeight = screenRect.height < this.getSize().height ?
 screenRect.height : screenRect.height/2 - this.getSize().height/2; //this.setLocation(centerWidth, centerHeight);
        //contentPane.setLocation(0, 0);
        //contentPane.setSize(jPanel1.getToolkit().getDefaultToolkit().getScreenSize());
        this.setBounds(0,0,screenRect.width,screenRect.height); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
} public static void main(String[] args)
{
        ClientUser cu = new ClientUser();
}
public void actionPerformed(ActionEvent e)
{}
private class QxbirdTableModel extends DefaultTableModel
{
QxbirdTableModel(String[] columnName,int columnNo)
{
super(columnName,columnNo);
}
public boolean isCellEditable(int row, int col)
{
return false;
}
}
}

Answer 5

to  netwebs(Only Java)  上面的是我的代码 请指正！！！

Answer 6

修改如下，在this.pack();后面加上句话就行了，再试this.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
this.setBounds(0,0,screenSize.width,screenSize.height);

Answer 7

况且 我的代码内 也有this.pack() 这句话 只是位置稍微靠后而已！

Answer 8

在setVisible(true);之后，加上一句:
setExtendedState(JFrame.MAXIMIZED_BOTH);

Answer 9

I服了you,你真懒的可以~~~呵呵
这50分可不够了，你得再给100分~~
这是调试好的代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class ClientUser extends JFrame implements ActionListener
{
private JPanel contentPane;
private JPanel jPanel1 = new JPanel();
private JPanel jPanel2 = new JPanel();
private JScrollPane jScrollPane1 = new JScrollPane(); private JMenuBar mnuBar = new JMenuBar();
private JMenu mnuFile = new JMenu("File");
private JMenuItem mnuFileQuit = new JMenuItem ("Exit"); private JMenu mnuHelp = new JMenu("Help");
private JTable jTable1 = new JTable();
private JComboBox jComboBox1 = new JComboBox();
private JComboBox jComboBox2 = new JComboBox();
private JLabel startLabel = new JLabel();
private JLabel endLabel = new JLabel();
private JPanel jPanel3 = new JPanel();
private JTextField ticketText = new JTextField();
private JLabel orderLabel = new JLabel();
private BorderLayout borderLayout1 = new BorderLayout();
private JButton showButton = new JButton();
private JButton orderButton = new JButton();
private JButton exitButton = new JButton();
private GridBagLayout gridBagLayout1 = new GridBagLayout();
private GridBagLayout gridBagLayout2 = new GridBagLayout();
private GridBagLayout gridBagLayout3 = new GridBagLayout(); String[]  columnName= {"Flight number", "Origin airport", "Destination airport", "Carrier", "Price", "Day",
"Time", "Duration","Available seats"};
QxbirdTableModel tableModel;
public ClientUser()
{
//setSelectStation();
//setShowTable(); contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
//this.setSize(new Dimension(800,400));
this.setTitle("Frame Title");
jPanel1.setBackground(Color.orange);
jPanel1.setBorder(BorderFactory.createLoweredBevelBorder());
jPanel1.setLayout(gridBagLayout3);
jPanel2.setBackground(Color.orange);
jPanel2.setBorder(BorderFactory.createLoweredBevelBorder());
jPanel2.setLayout(gridBagLayout1);
startLabel.setText("Departure Station");
endLabel.setText("Destination Station");
jPanel3.setBackground(Color.orange);
jPanel3.setBorder(BorderFactory.createEtchedBorder());
jPanel3.setLayout(gridBagLayout2);
orderLabel.setText("Order The Ticket  Here");
showButton.setText("Search");
orderButton.setText("Order");
orderButton.addActionListener(this);
exitButton.setText("Exit System");
exitButton.addActionListener(this); mnuFileQuit.addActionListener(this);
mnuFile.add(mnuFileQuit);
mnuBar.add(mnuFile);
        this.setJMenuBar( mnuBar ); contentPane.add(jPanel1, BorderLayout.CENTER);
jPanel1.add(jScrollPane1,  new GridBagConstraints(0, 0, 1, 1, 1.0, 1.0
,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 559, 393));
contentPane.add(jPanel2, BorderLayout.WEST);
jPanel2.add(jPanel3,  new GridBagConstraints(0, 5, 1, 1, 1.0, 1.0
,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(8, 2, 0, 0), 10, 8));
jPanel3.add(orderButton,  new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(11, 124, 5, 10), 20, -2));
jPanel3.add(orderLabel,  new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(21, 76, 0, 10), 11, 18));
jPanel3.add(ticketText,  new GridBagConstraints(0, 1, 1, 1, 1.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 64, 0, 10), 143, 0));
jPanel2.add(startLabel,  new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 116, 0, 8), 9, 9));
jPanel2.add(endLabel,  new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0
,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 104, 0, 12), 9, 9));
jPanel2.add(jComboBox1,  new GridBagConstraints(0, 1, 1, 1, 1.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 20, 0, 7), 73, 0));
jPanel2.add(showButton,  new GridBagConstraints(0, 4, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(19, 132, 0, 10), 34, -2));
jPanel2.add(jComboBox2,  new GridBagConstraints(0, 3, 1, 1, 1.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 20, 0, 9), 71, 0));
jPanel2.add(exitButton,  new GridBagConstraints(0, 6, 1, 1, 0.0, 0.0
,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(80, 55, 5, 58), 17, -2)); Dimension screenRect = Toolkit.getDefaultToolkit().getScreenSize();
int centerWidth = screenRect.width < this.getSize().width ?
screenRect.width : screenRect.width/2 - this.getSize().width/2;
int centerHeight = screenRect.height < this.getSize().height ?
 screenRect.height : screenRect.height/2 - this.getSize().height/2; //this.setLocation(centerWidth, centerHeight);
        //contentPane.setLocation(0, 0);
        //contentPane.setSize(jPanel1.getToolkit().getDefaultToolkit().getScreenSize());
        this.setBounds(0,0,screenRect.width,screenRect.height); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        this.setBounds(0,0,screenSize.width,screenSize.height); this.setVisible(true);
} public static void main(String[] args)
{
        ClientUser cu = new ClientUser();
}
public void actionPerformed(ActionEvent e)
{}
private class QxbirdTableModel extends DefaultTableModel
{
QxbirdTableModel(String[] columnName,int columnNo)
{
super(columnName,columnNo);
}
public boolean isCellEditable(int row, int col)
{
return false;
}
}
}

Answer 10

忘了把你原来的代码给去了，其实就是要在
this.pack()；之后再设定窗体的大小，这就是pack()的作用，this.pack()之前的所有窗体大小设定是不管用的。

Answer 11

大哥 你的那东西 就那么加上去 能编译过去吗？setExtendedState 是那各类的方法 小人 没见过 或是您打错了？

Answer 12

郑重宣布 netwebs(Only Java) 得分！(你们都是江湖我大哥)

Answer 13

老大啊，你的代码我一点也没改啊，只是在你的this.pack();这句后面加了下面这两句而已
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
yourFrame.setBounds(0,0,screenSize.width,screenSize.height);
（可能是复制的时候有问题）

Answer 14

I 简直 F 了YOU 
setExtendedState明明是你自己的你倒来问我~~郁闷

Answer 15

虽然结了，还是说清楚吧
setExtendedState是javax.swing.JFrame实例的方法，参数是javax.swing.JFrame.MAXIMIZED_BOTH