Java Swing 学习笔记(1) -- JTable

Java Swing 学习笔记(1) -- JTable

这个例子是JTable可以选择行和列，界面如图


代码如下

import  java.awt.BorderLayout;
import  java.awt.GridLayout;
import  java.awt.event.ActionEvent;
import  java.awt.event.ActionListener;

import  javax.swing.JCheckBox;
import  javax.swing.JFrame;
import  javax.swing.JLabel;
import  javax.swing.JPanel;
import  javax.swing.JScrollPane;
import  javax.swing.JTable;
import  javax.swing.ListSelectionModel;
import  javax.swing.event.ListSelectionEvent;
import  javax.swing.event.ListSelectionListener;
import  javax.swing.table.AbstractTableModel;
import  javax.swing.table.TableModel;

public   class  A7_SelectionModel  extends  JFrame {
     public  A7_SelectionModel() {
         super ( " Selection Model Test " );
        setSize( 450 ,  350 );
         this .setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        TableModel m  =   new  AbstractTableModel() {
             public   int  getColumnCount() {
                 return   10 ;
            }

             public   int  getRowCount() {
                 return   10 ;
            }

             public  Object getValueAt( int  r,  int  c) {
                 return   ""   +  (r + 1 ) * (c + 1 );
            }            
        };
        
         final  JTable jt  =   new  JTable(m);
        
         this .getContentPane().add( new  JScrollPane(jt), BorderLayout.CENTER);
        
        JPanel controlPanel, buttonPanel, columnPanel, rowPanel;
        
        buttonPanel  =   new  JPanel();
         final  JCheckBox cellBox, columnBox, rowBox;
        cellBox  =   new  JCheckBox( " Cells " , jt.getCellSelectionEnabled());
        columnBox  =   new  JCheckBox( " Columns " , jt.getColumnSelectionAllowed());
        rowBox  =   new  JCheckBox( " Rows " , jt.getRowSelectionAllowed());
        
        cellBox.addActionListener( new  ActionListener() {
             public   void  actionPerformed(ActionEvent e) {
                jt.setCellSelectionEnabled(cellBox.isSelected());
                columnBox.setSelected(jt.getColumnSelectionAllowed());
                rowBox.setSelected(jt.getRowSelectionAllowed());
            }
        });
        columnBox.addActionListener( new  ActionListener() {
             public   void  actionPerformed(ActionEvent e) {
                jt.setColumnSelectionAllowed(columnBox.isSelected());
                cellBox.setSelected(jt.getCellSelectionEnabled());
            }
        });
        rowBox.addActionListener( new  ActionListener() {
             public   void  actionPerformed(ActionEvent e) {
                jt.setRowSelectionAllowed(rowBox.isSelected());
                cellBox.setSelected(jt.getCellSelectionEnabled());
            }
        });
        
        buttonPanel.add( new  JLabel( " Selections allowed: " ));
        buttonPanel.add(cellBox);
        buttonPanel.add(columnBox);
        buttonPanel.add(rowBox);
        
        columnPanel  =   new  JPanel();
        ListSelectionModel csm  =  jt.getColumnModel().getSelectionModel();
        JLabel columnCounter  =   new  JLabel( " (Selected Column INdices Go Here) " );
        csm.addListSelectionListener( new  SelectionDebugger(columnCounter, csm));
        columnPanel.add( new  JLabel( " Selected columns: " ));
        columnPanel.add(columnCounter);
        
        rowPanel  =   new  JPanel();
        ListSelectionModel rsm  =  jt.getColumnModel().getSelectionModel();
        JLabel rowCounter  =   new  JLabel( " (Selected Row INdices Go Here) " );
        rsm.addListSelectionListener( new  SelectionDebugger(columnCounter, csm));
        rowPanel.add( new  JLabel( " Selected Rows: " ));
        rowPanel.add(rowCounter);
        
        controlPanel  =   new  JPanel( new  GridLayout( 0 ,  1 ));
        controlPanel.add(buttonPanel);
        controlPanel.add(columnPanel);
        controlPanel.add(rowPanel);
        
         this .getContentPane().add(controlPanel, BorderLayout.SOUTH);
        
    }
     class  SelectionDebugger  implements  ListSelectionListener  {
        JLabel debugger;
        ListSelectionModel model;
         public  SelectionDebugger(JLabel l, ListSelectionModel m) {
             this .debugger  =  l;
             this .model  =  m;
        }
         public   void  valueChanged(ListSelectionEvent e) {
             if  ( ! e.getValueIsAdjusting()) {
                StringBuffer buf  =   new  StringBuffer();
                 int [] selecton  =  getSelectonIndices(model.getMinSelectionIndex(),
                        model.getMaxSelectionIndex());
                 if  (selecton.length  ==   0 ) {
                    buf.append( " NONE " );
                }  else  {
                     for  ( int  i  =   0 ; i  <  selecton.length  -   1 ; i ++ ) {
                        buf.append(selecton[i]);
                        buf.append( " , " );
                    }
                    buf.append(selecton[selecton.length  -   1 ]);
                }
                debugger.setText(buf.toString());
            }
        }
        
         protected   int [] getSelectonIndices( int  start,  int  stop) {
             if  ((start  ==   - 1 )  ||  (stop  ==   - 1 )) {
                 return   new   int [ 0 ];
            }
            
             int  guesses[]  =   new   int [stop  -  start  +   1 ];
             int  index  =   0 ;
             for  ( int  i  =  start; i  <=  stop; i ++ ) {
                 if  (model.isSelectedIndex(i)) {
                    guesses[index ++ ]  =  i;
                }
            }
             int  realthing[]  =   new   int [index];
            System.arraycopy(guesses,  0 , realthing,  0 , index);
             return  realthing;
        }
        
        
    }
     public   static   void  main(String args[]) {
        AbmUtils.setLookAndFeel();
        A7_SelectionModel s  =   new  A7_SelectionModel();
        s.setVisible( true );
    }
}

</script>