在任何人告诉我去谷歌搜索之前，我已经做到了，到目前为止，每一种方法都没有用。
我曾尝试使用渲染器为jTable的单元格着色，但它们没用，因为它们落后于桌面而无法看到。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);
}
}
}
}
我还没有把它放进一个渲染器级别，因为它滞后了，我把它放在了一个双重的cicle中，特别是放入第二个cicle中。我想让它为超过24的细胞着色，就像现在一样，如果我写的话，它不起作用
c.setBackground(Color.red);
它完全为桌子着色
修改
正如所提出的，我创建了一个描述我的问题的小例子，我不知道是否有特定方式发布可运行的示例，但以下代码（在netbeans中）代表完整的程序：
/*
* 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
}
答案 0 :(得分：2)
好的，在查看讨论主题之后，我来到这个解决方案......
...不要尝试获取渲染的组件 - 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
答案 1 :(得分：1)
在您的第一个代码示例中，您将完成一系列检查，并将背景颜色设置为红色。在所有其他情况下，您应将背景设置为默认背景颜色。您可以按table.getBackground();查找此背景颜色。
答案 2 :(得分：1)
首先，变量名不应以大写字母开头。你的一些变量是正确的，有些则不是。保持一致!!!
我尝试使用渲染器为jTable的单元格着色，但它们没用，它们落在桌子上并且无法看到。
仅仅因为你不明白这个概念并没有使它变得无用。问题在于您的代码，而不是渲染器的概念。
您发布的代码毫无意义。您无法设置单个单元格的颜色。单元格为渲染器时确定颜色，这就是您需要使用渲染器的原因。
它完全为桌子着色
是的，一旦设置了渲染器的背景，将来所有单元格都将使用该颜色。在渲染每个单元格之前，您需要将颜色重置为默认值
背景必须为红色，以防它是一个数字并且它高于24，
然后做一个积极的检查，忘记所有这些负面检查。
使用以上所有建议您可能会有一个渲染器：
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;
}
}