doublerender.java

参考了JAVA方面MIS系统开发的书籍做的一个 电力收费的系统,包里面是可以直接运行的JAR文件了...SRC是源文件可一些需要的包...数据库是用的MSQLserver2000,"java程序数据

import java.text.*;
import javax.swing.*;     
import java.awt.*;
import javax.swing.table.*;
class DoubleRender extends JLabel  implements TableCellRenderer{
	NumberFormat nf = NumberFormat.getNumberInstance();
	DecimalFormat df= (DecimalFormat)nf;  //和读数的精确到小数点后3位
	public DoubleRender(){
		super();
		setOpaque(true); 
		df.applyPattern("##########0.00");
		this.setHorizontalAlignment(SwingConstants.RIGHT);
		setHorizontalTextPosition(SwingConstants.RIGHT);
	}
	public Component getTableCellRendererComponent(
								JTable table, Object str, 
                                boolean isSelected, boolean hasFocus,
                                int row, int column) 
	{
		if (isSelected){
			this.setForeground(table.getSelectionForeground());
			this.setBackground(table.getSelectionBackground());
		}
		else{
			this.setForeground(table.getForeground());
			this.setBackground(table.getBackground());
		}
		Object value=table.getModel().getValueAt(row,column);
		String display="";
		if(value!=null)	display=df.format(value);
		this.setText(display);		
		return this;
	}
}