Java 插入行选择jTable
我有一个JTable,每当我在最后第二列上制表符时,它都会插入一个空行,这很好。我还添加了Java 插入行选择jTable,java,swing,nullpointerexception,jtable,Java,Swing,Nullpointerexception,Jtable,我有一个JTable,每当我在最后第二列上制表符时,它都会插入一个空行,这很好。我还添加了table.setRowSelectionInterval(lastRow,lastRow)同时选择新插入的行,但它抛出了一个java.lang.NullPointerException 需要帮助来选择最后插入的行。提前谢谢 public class JFrameTable extends javax.swing.JFrame { protected JTable table; public JFra
table.setRowSelectionInterval(lastRow,lastRow)
同时选择新插入的行,但它抛出了一个java.lang.NullPointerException
需要帮助来选择最后插入的行。提前谢谢
public class JFrameTable extends javax.swing.JFrame {
protected JTable table;
public JFrameTable() {
initComponents();
}
public void setValueAt(int col){
DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
if(col==2){
Vector row = new Vector();
row.add(null);
row.add(null);
row.add(null);
row.add(null);
model.addRow(row);
}
}
private class MyKeyListener implements KeyListener {
public MyKeyListener() {
}
@Override
public void keyReleased(KeyEvent e) {
if(e.getKeyCode()==e.VK_TAB){
int column = jTable1.getSelectedColumn();
int rowCount= jTable1.getRowCount();
int currentRow=jTable1.getSelectedRow();
if(currentRow==rowCount-1) {
jTable1.editCellAt(currentRow, column);
jTable1.transferFocus();
}
if(column==3 && currentRow==rowCount-1){
setValueAt(2);
}
if(column==3){
currentRow++;
column=0;
jTable1.editCellAt(currentRow, column);
jTable1.transferFocus();
try{
table.setRowSelectionInterval(rowCount-1,rowCount-1);
}catch(Exception ek){
System.out.println(ek);
}
}
System.out.println(rowCount);
}
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyPressed(KeyEvent e) {
}
}
private class MySelectionListener implements ListSelectionListener {
public MySelectionListener() {
}
@Override
public void valueChanged(ListSelectionEvent e) {
}
}
private class setTableModelListener implements TableModelListener{
public void tableChanged(TableModelEvent e) {
}
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTable1.setBackground(new java.awt.Color(75, 107, 221));
jTable1.setFont(new java.awt.Font("SansSerif", 1, 15)); // NOI18N
jTable1.setForeground(new java.awt.Color(254, 247, 247));
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null}
},
new String [] {
"Name", "Roll", "Stream", "Sex"
}
) {
boolean[] canEdit = new boolean [] {
true, true, true, false
};
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit [columnIndex];
}
});
jTable1.getModel().addTableModelListener(new setTableModelListener());
jTable1.getTableHeader().setReorderingAllowed(false);
jTable1.setRowHeight(20);
jTable1.getTableHeader().setBackground(Color.BLACK);
jTable1.getTableHeader().setFont(new Font ("SansSerif", Font.BOLD ,15));
jTable1.getTableHeader().setForeground(Color.WHITE);
jTable1.getColumnModel().getSelectionModel().addListSelectionListener(new MySelectionListener());
jTable1.addKeyListener(new MyKeyListener());
jTable1.setRowSelectionAllowed(true);
jScrollPane1.setViewportView(jTable1);
jTable1.getColumnModel().getColumn(0).setResizable(false);
jTable1.getColumnModel().getColumn(0).setPreferredWidth(150);
jTable1.getColumnModel().getColumn(1).setResizable(false);
jTable1.getColumnModel().getColumn(1).setPreferredWidth(50);
jTable1.getColumnModel().getColumn(2).setResizable(false);
jTable1.getColumnModel().getColumn(2).setPreferredWidth(30);
jTable1.getColumnModel().getColumn(3).setResizable(false);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 630, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 205, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 95, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new JFrameTable().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
// End of variables declaration
}
公共类JFrameTable扩展了javax.swing.JFrame{
保护JTable表;
公共JFrameTable(){
初始化组件();
}
公共无效设置值(整数列){
DefaultTableModel=(DefaultTableModel)jTable1.getModel();
如果(列==2){
向量行=新向量();
行。添加(空);
行。添加(空);
行。添加(空);
行。添加(空);
model.addRow(row);
}
}
私有类MyKeyListener实现KeyListener{
公共MyKeyListener(){
}
@凌驾
公共无效密钥已释放(密钥事件e){
if(e.getKeyCode()==e.VK_选项卡){
int column=jTable1.getSelectedColumn();
int rowCount=jTable1.getRowCount();
int currentRow=jTable1.getSelectedRow();
如果(currentRow==rowCount-1){
jTable1.editCellAt(当前行,列);
jTable1.transferFocus();
}
如果(列==3&¤tRow==rowCount-1){
setValueAt(2);
}
如果(列==3){
currentRow++;
列=0;
jTable1.editCellAt(当前行,列);
jTable1.transferFocus();
试试{
表.setRowSelectionInterval(rowCount-1,rowCount-1);
}捕获(例外情况){
系统输出打印LN(ek);
}
}
System.out.println(行计数);
}
}
@凌驾
public void keyTyped(KeyEvent e){
}
@凌驾
按下公共无效键(按键事件e){
}
}
私有类MySelectionListener实现ListSelectionListener{
public MySelectionListener(){
}
@凌驾
public void值已更改(ListSelectionEvent e){
}
}
私有类setTableModelListener实现TableModelListener{
公共作废表已更改(TableModelEvent e){
}
}
@抑制警告(“未选中”)
//
私有组件(){
jScrollPane1=newjavax.swing.JScrollPane();
jTable1=newjavax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTable1.setBackground(新java.awt.Color(75107221));
jTable1.setFont(新的java.awt.Font(“SansSerif”,1,15));//NOI18N
jTable1.set前台(新java.awt.Color(254,247,247));
jTable1.setModel(新的javax.swing.table.DefaultTableModel(
新对象[][]{
{null,null,null,null}
},
新字符串[]{
“姓名”、“滚动”、“流”、“性别”
}
) {
boolean[]canEdit=新的boolean[]{
真,真,真,假
};
公共布尔值isCellEditable(int-rowIndex、int-columnIndex){
返回canEdit[columnIndex];
}
});
jTable1.getModel().addTableModelListener(新的setTableModelListener());
jTable1.getTableHeader().setReorderingAllowed(false);
jTable1.设置行高(20);
jTable1.getTableHeader().setBackground(颜色.黑色);
jTable1.getTableHeader().setFont(新字体(“SansSerif”,Font.BOLD,15));
jTable1.getTableHeader().setForeground(Color.WHITE);
jTable1.getColumnModel().getSelectionModel().addListSelectionListener(新的MySelectionListener());
jTable1.addKeyListener(新的MyKeyListener());
jTable1.setRowSelectionAllowed(真);
jScrollPane1.setViewportView(jTable1);
jTable1.getColumnModel().getColumn(0).setResizeable(false);
jTable1.getColumnModel().getColumn(0).setPreferredWidth(150);
jTable1.getColumnModel().getColumn(1).setResizeable(false);
jTable1.getColumnModel().getColumn(1.setPreferredWidth(50);
jTable1.getColumnModel().getColumn(2).setResizeable(false);
jTable1.getColumnModel().getColumn(2.setPreferredWidth(30);
jTable1.getColumnModel().getColumn(3).setResizeable(false);
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1,javax.swing.GroupLayout.DEFAULT\u SIZE,630,Short.MAX\u值)
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1,javax.swing.GroupLayout.PREFERRED_SIZE,205,javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0,95,短。最大值))
);
包装();
}//
/**
*@param指定命令行参数
*/
公共静态void main(字符串参数[]){
/*设置Nimbus的外观和感觉*/
//
/*如果Nimbus(在JavaSE6中引入)不可用,请使用默认的外观。
*详情请参阅http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
试一试{
for(javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager.getInstalledLookAndFeels()){
if(“Nimbus”.equals(info.getName())){
setLookAndFeel(info.getClassName());
打破
}
}
}捕获(ClassNotFoundException ex){
getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(实例化异常){
getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}捕获(非法访问例外){
getLogger(JFrameTable.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}ca
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.util.Vector;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;
public class TestTable {
public static void main(String[] args) {
new TestTable();
}
public TestTable() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(4, 4);
JTable table = new JTable(model);
InputMap im = table.getInputMap();
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0), "CellAction");
ActionMap am = table.getActionMap();
am.put("CellAction", new CellAction(table));
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class CellAction extends AbstractAction {
private JTable table;
public CellAction(JTable table) {
this.table = table;
}
@Override
public void actionPerformed(ActionEvent e) {
int column = table.getSelectedColumn();
int rowCount = table.getRowCount();
int currentRow = table.getSelectedRow();
if (currentRow == rowCount - 1) {
table.editCellAt(currentRow, column);
}
if (column == 3 && currentRow == rowCount - 1) {
DefaultTableModel model = (DefaultTableModel) table.getModel();
Vector row = new Vector();
row.add(null);
row.add(null);
row.add(null);
row.add(null);
model.addRow(row);
}
if (column == 3) {
currentRow++;
column = 0;
table.setRowSelectionInterval(currentRow, currentRow);
table.setColumnSelectionInterval(column, column);
table.editCellAt(currentRow, column);
}
}
}
}