java 单元格颜色_java – Swing – 根据单元格的值设置单元格的颜色
我想根据单元格的值设置单元格的颜色.谷歌搜索了一下我发现我可以使用这样的东西：
public class TableCellRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(
JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int col)
{
// get the DefaultCellRenderer to give you the basic component
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
// apply your rules
if (value.toString().equals("Red"))
c.setBackground(Color.RED);
else
c.setBackground(Color.GRAY);
return c;
}
}
我遇到的问题是我想要修改的代码已经为JTable的列设置了TableCellRendererer.代码中有一个函数如下所示：
private void configureTableColumns() {
Enumeration columns = this.table.getColumnModel().getColumns();
while (columns.hasMoreElements()) {
TableColumn tableColumn = (TableColumn) columns.nextElement();
this.setCellRenderer(tableColumn);
TableCellRenderer renderer = tableColumn.getCellRenderer();
if (renderer == null) {
renderer = this.table.getDefaultRenderer(Object.class);
}
tableColumn.setCellRenderer(renderer);
this.setCellEditor(tableColumn);
}
}
使用上面的代码,我还需要添加前面显示的TableCellRenderer类吗？我想要做的就是检查单元格的值是否为“ABC”并将背景设置为RED.
更新：
我确实尝试将我的TableCellRenderer版本添加为我想修改的代码中的内部类,但是我得到一个错误,即tableColumn.getCellRenderer()中存在类型不匹配.
Type mismatch: cannot convert from TableCellRenderer to MyTableExample.TableCellRenderer
谢谢
解决方法:
覆盖prepareRenderer方法来执行此操作.
例：
public Component prepareRenderer (TableCellRenderer renderer, int rowIndex, int columnIndex){
Component componenet = super.prepareRenderer(renderer, rowIndex, columnIndex);
if(getValueAt(rowIndex, columnIndex).toString().equals("Red")) {
componenet.setBackground(Color.RED);
} else if(getValueAt(rowIndex, columnIndex).toString().equals("Green")) {
componenet.setBackground(Color.GREEN);
}
return componenet;
}
更新：
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class PrepareRendereEx {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(new Dimension(400, 100));
Object data[][] = { {"java", "j2ee"},
{"java", "j2ee"},
{"java", "j2ee"}
};
Object[] columnNames = {"Java", "J2EE"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model) {
@Override
public Component prepareRenderer(TableCellRenderer renderer, int rowIndex,
int columnIndex) {
JComponent component = (JComponent) super.prepareRenderer(renderer, rowIndex, columnIndex);
if(getValueAt(rowIndex, 0).toString().equalsIgnoreCase("java") && columnIndex == 0) {
component.setBackground(Color.RED);
} else if(getValueAt(rowIndex, 1).toString().equalsIgnoreCase("j2ee") && columnIndex == 1){
component.setBackground(Color.GREEN);
}
return component;
}
};
frame.add(new JScrollPane(table));
frame.setVisible(true);
}
}
OUTPUT：
标签：java,swing,jtable,tablecellrenderer
来源： https://codeday.me/bug/20191008/1871700.html