这是制作框架和选项卡式窗格的类：
package homeworkToolkitRevised;
import javax.swing.*;
import javax.swing.plaf.nimbus.NimbusLookAndFeel;
import java.awt.event.*;
public class MakeGUI extends JFrame
{
private static final long serialVersionUID = 1L;
JTabbedPane TabPane;
public MakeGUI()
{
this.setTitle("The Homework Toolkit!");
setSize(700, 500);
setAlwaysOnTop(false);
setNimbus();
JTabbedPane TabPane = new JTabbedPane();
add(TabPane);
TabPane.addTab("Main Menu", new MainScreen());
TabPane.addTab("Quadratic Equations", new Quadratic());
setVisible(true);
}
public void setAlwaysTop()
{
setAlwaysOnTop(true);
}
public void setNotAlwaysTop()
{
setAlwaysOnTop(false);
}
public final void setNimbus()
{
try
{
UIManager.setLookAndFeel(new NimbusLookAndFeel());
} catch (UnsupportedLookAndFeelException e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
new MakeGUI();
}
}
这是选项卡式窗格中的一个选项卡：
package homeworkToolkitRevised;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Quadratic extends JPanel implements ActionListener, ItemListener
{
private static final long serialVersionUID = 1L;
JLabel lblX2 = new JLabel ("Co-Efficient Of x²:", JLabel.LEFT);
JLabel lblX = new JLabel ("Co-Efficient of x:", JLabel.LEFT);
JLabel lblNum = new JLabel ("Number:", JLabel.LEFT);
JLabel lblNature = new JLabel ("Nature Of Roots:", JLabel.LEFT);
JLabel lblVal1 = new JLabel ("Value 1:", JLabel.LEFT);
JLabel lblVal2 = new JLabel ("Value 2:", JLabel.LEFT);
JTextField tfX2 = new JTextField (20);
JTextField tfX = new JTextField (20);
JTextField tfNum = new JTextField (20);
JTextField tfNature = new JTextField (20);
JTextField tfVal1 = new JTextField (20);
JTextField tfVal2 = new JTextField (20);
JPanel[] row = new JPanel[7];
JButton btnNature = new JButton ("Nature Of Roots");
JButton btnCalc = new JButton ("Calculate");
JButton btnClear = new JButton ("Clear");
double a = 0, b = 0, c = 0;
double Val1 = 0, Val2 = 0, Discriminant = 0;
String StrVal1, StrVal2;
Quadratic()
{
setLayout(new GridLayout(8,1));
for(int i = 0; i < 7; i++)
{
row[i] = new JPanel();
add(row[i]);
row[i].setLayout(new GridLayout (1,2));
}
row[3].setLayout(new GridLayout (1,3));
row[0].add(lblX2);
row[0].add(tfX2);
row[1].add(lblX);
row[1].add(tfX);
row[2].add(lblNum);
row[2].add(tfNum);
row[3].add(btnNature);
{
btnNature.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
Nature();
}
}
);
}
row[3].add(btnCalc);
{
btnCalc.setEnabled(false);
btnCalc.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
Calculate();
}
}
);
}
row[3].add(btnClear);
{
btnClear.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
Clear();
}
}
);
}
row[4].add(lblNature);
row[4].add(tfNature);
row[5].add(lblVal1);
row[5].add(tfVal1);
row[6].add(lblVal2);
row[6].add(tfVal2);
tfNature.setEditable(false);
tfVal1.setEditable(false);
tfVal2.setEditable(false);
JCheckBox chckbxAlwaysOnTop = new JCheckBox("Always On Top");
chckbxAlwaysOnTop.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent ie)
{
if(ie.getStateChange() == ItemEvent.SELECTED)
{
//setAlwaysTop();
//This is method from main class to change always on top condition of jframe
}
else if (ie.getStateChange() == ItemEvent.DESELECTED)
{
//setNotAlwaysTop();
//This is method from main class to change always on top condition of jframe
}
}
});
add(chckbxAlwaysOnTop);
setVisible(true);
}
public void Calculate()
{
a = Double.parseDouble(tfX2.getText());
b = Double.parseDouble(tfX.getText());
c = Double.parseDouble(tfNum.getText());
Val1 = (-b + Math.sqrt(Discriminant)) / (2 * a);
Val2 = (-b - Math.sqrt(Discriminant)) / (2 * a);
StrVal1 = String.valueOf(Val1);
StrVal2 = String.valueOf(Val2);
tfVal1.setText(StrVal1);
tfVal2.setText(StrVal2);
tfX2.setText("");
tfX.setText("");
tfNum.setText("");
btnCalc.setEnabled(false);
}
public void Clear()
{
a = 0; b = 0; c = 0;
Val1 = 0; Val2 = 0; Discriminant = 0;
tfX2.setText("");
tfX.setText("");
tfNum.setText("");
tfVal1.setText("");
tfVal2.setText("");
tfNature.setText("");
}
public void Nature()
{
a = Double.parseDouble(tfX2.getText());
b = Double.parseDouble(tfX.getText());
c = Double.parseDouble(tfNum.getText());
Discriminant = (b*b) - (4*(a*c));
if (Discriminant == 0)
{
tfNature.setText("Equal");
btnCalc.setEnabled(true);
}
else if (Discriminant < 0)
{
tfNature.setText("Imaginary");
}
else
{
tfNature.setText("Real, Distinct");
btnCalc.setEnabled(true);
}
}
public void actionPerformed(ActionEvent arg0)
{
// TODO Auto-generated method stub
}
public void itemStateChanged(ItemEvent arg0)
{
// TODO Auto-generated method stub
}
}
所以我想要做的是在选项卡中添加一个复选框，允许我将主类中的 JFrame 的属性设置为始终位于顶部。首先，我不明白如何正确调用该方法，以便它改变始终位于顶部的属性。我尝试为它制作一个对象，也尝试将方法设为静态，但它不起作用。
我想知道的是用于方法的修饰符以及如何从 JTabbedPane 内部更改父 JFrame 的属性。
谢谢。
编辑：如果我可以将此复选框添加到 JFrame 本身（如 JTabbed 窗格下方）或其他可以更轻松地使用多个选项卡进行管理的东西，它也会起作用。