Java JTablebackground不';具有整数类行的t色单元格
我面临的问题是,如果我想根据TableModel a column Integer类为特定行着色,它不会更改颜色。只要我将column类更改为String,它就会工作 这里有什么问题Java JTablebackground不';具有整数类行的t色单元格,java,swing,class,colors,jtable,Java,Swing,Class,Colors,Jtable,我面临的问题是,如果我想根据TableModel a column Integer类为特定行着色,它不会更改颜色。只要我将column类更改为String,它就会工作 这里有什么问题 private class TableRendererSelectedRow extends DefaultTableCellRenderer { @Override public Component getTableCellRendererComponent(JTable table, O
private class TableRendererSelectedRow extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
setBackground(null);
Component tableCellRendererComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (model.getSelectedRow()==row) {
setBackground(Color.RED);
tableCellRendererComponent.setBackground(Color.RED);
}
return tableCellRendererComponent;
}
}
编辑:这里是SSCEE
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
/**
* TableRenderDemo is just like TableDemo, except that it
* explicitly initializes column sizes and it uses a combo box
* as an editor for the Sport column.
*/
public class TableRenderDemo extends JPanel {
private boolean DEBUG = false;
public TableRenderDemo() {
super(new GridLayout(1,0));
JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Set up column sizes.
initColumnSizes(table);
//Fiddle with the Sport column's cell editors/renderers.
setUpSportColumn(table, table.getColumnModel().getColumn(2));
table.setDefaultRenderer(Object.class, new TableRendererSelectedRow());
//Add the scroll pane to this panel.
add(scrollPane);
}
/*
* This method picks good column sizes.
* If all column heads are wider than the column's cells'
* contents, then you can just use column.sizeWidthToFit().
*/
private void initColumnSizes(JTable table) {
MyTableModel model = (MyTableModel)table.getModel();
TableColumn column = null;
Component comp = null;
int headerWidth = 0;
int cellWidth = 0;
Object[] longValues = model.longValues;
TableCellRenderer headerRenderer =
table.getTableHeader().getDefaultRenderer();
for (int i = 0; i < 5; i++) {
column = table.getColumnModel().getColumn(i);
comp = headerRenderer.getTableCellRendererComponent(
null, column.getHeaderValue(),
false, false, 0, 0);
headerWidth = comp.getPreferredSize().width;
comp = table.getDefaultRenderer(model.getColumnClass(i)).
getTableCellRendererComponent(
table, longValues[i],
false, false, 0, i);
cellWidth = comp.getPreferredSize().width;
if (DEBUG) {
System.out.println("Initializing width of column "
+ i + ". "
+ "headerWidth = " + headerWidth
+ "; cellWidth = " + cellWidth);
}
column.setPreferredWidth(Math.max(headerWidth, cellWidth));
}
}
public void setUpSportColumn(JTable table,
TableColumn sportColumn) {
//Set up the editor for the sport cells.
JComboBox comboBox = new JComboBox();
comboBox.addItem("Snowboarding");
comboBox.addItem("Rowing");
comboBox.addItem("Knitting");
comboBox.addItem("Speed reading");
comboBox.addItem("Pool");
comboBox.addItem("None of the above");
sportColumn.setCellEditor(new DefaultCellEditor(comboBox));
//Set up tool tips for the sport cells.
DefaultTableCellRenderer renderer =
new DefaultTableCellRenderer();
renderer.setToolTipText("Click for combo box");
sportColumn.setCellRenderer(renderer);
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
public final Object[] longValues = {"Jane", "Kathy",
"None of the above",
new Integer(20), Boolean.TRUE};
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass(int col) {
if(col==3) {
return Integer.class;
}
return String.class;
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");
}
data[row][col] = value;
fireTableCellUpdated(row, col);
if (DEBUG) {
System.out.println("New value of data:");
printDebugData();
}
}
private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);
}
System.out.println();
}
System.out.println("--------------------------");
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
private class TableRendererSelectedRow extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
setBackground(null);
Component tableCellRendererComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (2==row) {
setBackground(Color.RED);
}
return tableCellRendererComponent;
}
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("TableRenderDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
TableRenderDemo newContentPane = new TableRenderDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
import javax.swing.DefaultCellEditor;
导入javax.swing.JComboBox;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
导入javax.swing.JScrollPane;
导入javax.swing.JTable;
导入javax.swing.table.AbstractTableModel;
导入javax.swing.table.DefaultTableCellRenderer;
导入javax.swing.table.TableCellRenderer;
导入javax.swing.table.TableColumn;
导入java.awt.Color;
导入java.awt.Component;
导入java.awt.Dimension;
导入java.awt.GridLayout;
/**
*TableRenderDemo与TableDemo一样,只是
*显式初始化列大小,并使用组合框
*作为体育专栏的编辑。
*/
公共类TableRenderDemo扩展了JPanel{
私有布尔调试=false;
公共TableRenderDemo(){
超级(新网格布局(1,0));
JTable table=newjtable(newmytablemodel());
表.setPreferredScrollableViewportSize(新维度(500,70));
表.setFillsViewPerthweight(真);
//创建滚动窗格并将表添加到其中。
JScrollPane scrollPane=新的JScrollPane(表);
//设置列大小。
初始列大小(表);
//摆弄体育专栏的单元格编辑器/渲染器。
setUpSportColumn(table,table.getColumnModel().getColumn(2));
setDefaultRenderer(Object.class,新的TableRenderSelectedRow());
//将滚动窗格添加到此面板。
添加(滚动窗格);
}
/*
*此方法选择良好的列大小。
*如果所有列标题的宽度都大于列单元格的宽度
*内容,然后您可以只使用column.sizeWidthToFit()。
*/
专用void initColumnSizes(JTable表){
MyTableModel=(MyTableModel)table.getModel();
TableColumn=null;
组件comp=null;
int headerWidth=0;
int cellWidth=0;
对象[]longValues=model.longValues;
台球头球吊杆=
table.getTableHeader().getDefaultRenderer();
对于(int i=0;i<5;i++){
column=table.getColumnModel().getColumn(i);
comp=headerRenderer.GetTableCellRenderComponent(
null,column.getHeaderValue(),
假,假,0,0);
headerWidth=组件getPreferredSize().宽度;
comp=table.getDefaultRenderer(model.getColumnClass(i))。
GetTableCellRenderComponent(
表,longValues[i],
假,假,0,我);
cellWidth=comp.getPreferredSize().width;
如果(调试){
System.out.println(“初始化列的宽度”
+i+“”
+“headerWidth=“+headerWidth
+“cellWidth=“+cellWidth”);
}
column.setPreferredWidth(Math.max(headerWidth,cellWidth));
}
}
公共列(JTable table,
表列(表列){
//设置运动单元格的编辑器。
JComboBox comboBox=新的JComboBox();
comboBox.addItem(“滑雪板”);
组合框。附加项(“划船”);
comboBox.addItem(“针织”);
comboBox.addItem(“快速读取”);
comboBox.addItem(“池”);
comboBox.addItem(“上述任何一项”);
setCellEditor(新的DefaultCellEditor(组合框));
//为运动单元设置工具提示。
DefaultTableCellRenderer渲染器=
新的DefaultTableCellRenderer();
setToolTipText(“单击组合框”);
sportColumn.setCellRenderer(渲染器);
}
类MyTableModel扩展了AbstractTableModel{
私有字符串[]columnNames={“名字”,
“姓氏”,
“运动”,
“#年”,
“素食者”};
私有对象[][]数据={
{“凯西”,“史密斯”,
“滑雪板”,新整数(5),新布尔值(假)},
{“约翰”,“多伊”,
“划船”,新整数(3),新布尔值(真)},
{“苏”,“黑”,
“编织”,新整数(2),新布尔值(假)},
{“简”、“白”,
“快速读取”,新整数(20),新布尔值(真)},
{“乔”,“布朗”,
“Pool”、新整数(10)、新布尔值(false)}
};
公共最终对象[]longValues={“Jane”,“Kathy”,
“以上都不是”,
新整数(20),Boolean.TRUE};
public int getColumnCount(){
返回columnNames.length;
}
public int getRowCount(){
返回数据长度;
}
公共字符串getColumnName(int-col){
返回列名[col];
}
公共对象getValueAt(整数行,整数列){
返回数据[行][col];
}
/*
*JTable使用此方法确定默认渲染器/
*每个单元格的编辑器。如果我们没有实现此方法,
*最后一列将包含文本(“真”/“假”),
*而不是复选框。
*/
公共类getColumnClass(int-col){
如果(列==3){
返回Integer.class;
}
返回字符串.class;
}
/*
*不需要实现此方法,除非您的表
*可编辑。
*/
平民的