我有以下類實現3個JPanel。 1個面板具有一個標籤,接下來的是按鈕和第三個是如在我的代碼描述的表:如何使用BorderLayout在JPanel中定位對象?
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import java.util.*;
import javax.swing.event.*;
class netTable implements ActionListener, TableModelListener
{
JFrame frame;
JTable table;
Vector rows,columns;
DefaultTableModel tabModel;
JScrollPane scrollPane;
JLabel lblMessage;
JButton cmdLookup, cmdUpdatePlan;
JPanel topPanel,mainPanel,buttonPanel;
public static void main(String[] args)
{
netTable t=new netTable();
}
netTable()
{
rows=new Vector();
columns= new Vector();
String[] columnNames =
{
"ID",
"Client",
"Plan",
"Amount"
};
addColumns(columnNames);
tabModel=new DefaultTableModel();
tabModel.setDataVector(rows,columns);
table = new JTable(tabModel);
scrollPane= new JScrollPane(table);//ScrollPane
table.setRowSelectionAllowed(false);
table.getModel().addTableModelListener(this);
topPanel = new JPanel();
lblMessage=new JLabel("Invoices to Update");
topPanel.add(lblMessage);
buttonPanel=new JPanel();
cmdLookup=new JButton("Lookup");
cmdUpdatePlan = new JButton("Update Plan");
buttonPanel.add(cmdLookup);
buttonPanel.add(cmdUpdatePlan);
cmdLookup.addActionListener(this);
cmdUpdatePlan.addActionListener(this);
mainPanel=new JPanel();
frame=new JFrame("Update Table");
frame.setSize(500,500);
frame.setExtendedState(JFrame.ICONIFIED);
mainPanel.setLayout(new BorderLayout());
mainPanel.add(topPanel,BorderLayout.NORTH);
mainPanel.add(buttonPanel,BorderLayout.CENTER);
mainPanel.add(scrollPane,BorderLayout.SOUTH);
topPanel.setBackground(Color.gray);
mainPanel.setBackground(Color.white);
buttonPanel.setBackground(Color.white);
table.getParent().setBackground(Color.black);
frame.getContentPane().add(mainPanel);
frame.addWindowListener(new WindowCloser());
frame.setVisible(true);
}
}
當我編譯此,它顯示buttonPanel在上面,一個空間,然後滾動窗格它下面,而忽略topPanel應該首先顯示在頂部的標籤。有任何想法嗎?我在想BorderLayout的位置是錯誤的。
不應該'mainPanel.add(ScrollPane,BorderLayout.SOUTH);'是'mainPanel.add(scrollPane,BorderLayout.SOUTH);'? – 2010-01-27 22:31:20
是的,我的編輯器大寫了它..我會解決這個問題,謝謝 – phill 2010-01-27 22:35:16