我正在尝试使用渲染器为jTable的单元格着色，但是它们不能很好地工作，因为它们滞后于表并且无法看到。这是我的代码：
TableCellRenderer Tcr = jTable1.getCellRenderer(x, y);
Component c = Tcr.getTableCellRendererComponent(jTable1, jTable1.getValueAt(x, y), false, false, x, y);
if(x > 0 && x < (jTable1.getRowCount()-1) && y > 1 && y < (jTable1.getColumnCount()-1)){
if(!jTable1.getValueAt(x, y).equals(null) && !jTable1.getValueAt(x, y).equals("F") && !jTable1.getValueAt(x, y).equals(" ")){
if(!jTable1.getValueAt(x, y).toString().contains("/P") && !jTable1.getValueAt(x, y).toString().equals("P")){
if(Double.parseDouble(jTable1.getValueAt(x, y).toString()) > 24){
setBackground(java.awt.Color.red);
}
}
}
}
我没有将其放入rendererclass中，因为它滞后了，我将其放入cicle的双精度中，具体地说，放入了第二个cicle。我希望它为超过24的单元格着色，因为现在，如果我写[
，它是行不通的c.setBackground(Color.red);
它完全给桌子上色
编辑
按照要求，我创建了一个描述我的问题的小示例，我不知道是否存在发布可运行示例的特定方法，但是以下代码（netbeans中的代码代表了完整的程序：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package fatturazione;
import ObjectModel.Timesheet;
import java.awt.Component;
import javax.swing.JLabel;
import javax.swing.table.TableCellRenderer;
/**
*
* @author xtphere
*/
public class Example extends javax.swing.JFrame {
/**
* Creates new form Main
*/
public Example() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
CheckButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane1.setViewportView(jTable1);
CheckButton.setText("Check the table");
CheckButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CheckButtonActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 375, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(CheckButton))
.addContainerGap(15, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 275, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(CheckButton)
.addGap(0, 35, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void CheckButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
int x, y, i = 1;
for(x = 0; x < jTable1.getRowCount(); x++){
for(y = 0; y < jTable1.getColumnCount(); y++){
TableCellRenderer Tcr = jTable1.getCellRenderer(x, y);
Component c = Tcr.getTableCellRendererComponent(jTable1, jTable1.getValueAt(x, y), false, false, x, y);
if(jTable1.getValueAt(x, y) == null)
{
jTable1.setValueAt("P", x, y);
}
if(jTable1.getValueAt(x, y) != null && !jTable1.getValueAt(x, y).equals("F") && !jTable1.getValueAt(x, y).equals(" ")){
System.out.print(jTable1.getValueAt(x, y)+"\n");
if(!jTable1.getValueAt(x, y).toString().contains("/P") && !jTable1.getValueAt(x, y).toString().equals("P")){
System.out.print("prima del maggiore di 24");
if(Double.parseDouble(jTable1.getValueAt(x, y).toString()) > 24){
System.out.print("leggi il 25, almeno?");
c.setBackground(java.awt.Color.red);
}
}
}
}
}
}
/**
* @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(Example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Example().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton CheckButton;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
// End of variables declaration
}
首先，变量名不应以大写字母开头。您的某些变量正确，而其他变量则不正确。保持一致！
我已经尝试使用渲染器为jTable的单元格着色，但是它们滞后于表并且看不到它们是没有用的。
仅仅因为您不理解该概念并不会使其失效。问题出在您的代码上，而不是渲染器的概念上。
您发布的代码没有意义。您无法设置单个单元格的颜色。颜色是在单元格为渲染器时确定的，这就是为什么需要使用渲染器的原因。
它完全使桌子变色
是，一旦您设置了渲染器的背景，以后所有单元格都将使用该颜色。您需要在渲染每个单元格之前将颜色重置为其默认设置]
背景必须为红色，以防万一，它是一个数字并且大于24，
然后进行正面检查，而忘记所有那些负面检查。
使用以上所有建议，您可能需要一个渲染器，如：
class ColorRenderer extends DefaultTableCellRenderer
{
@Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
{
super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (isSelected)
setBackground( table.getSelectionBackground() );
else
{
setBackground( table.getBackground() );
try
{
int number = Integer.parseInt( value.toString() );
if (number > 24)
setBackground( Color.RED );
}
catch(Exception e) {}
}
return this;
}
}
好吧，在讨论线程中，我来到了这个解决方案...
...不要尝试获取渲染的组件本身-告诉渲染器以您希望的方式绘制所需的组件...
CellRenderer renderer = new DefaultCellRenderer(){
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int col) {
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
JLabel label = (JLabel)c;
if (yourAlgorithmToDetectTheProperCell){ //i can't insert your condition from above, it's overkill ^^
label.setBackGround(Color.RED);
}
return label;
}
};
table.setCellRenderer(renderer);
SDF
在您的第一个代码示例中，您进行了一系列的检查，最后将背景色设置为红色。在所有其他情况下，应将背景设置为默认背景色。您可以通过table.getBackground();查找此背景色。