小编Net*_*tto的帖子

想象一下,我有一个定义a的抽象类Generic Type.所有子类都将实现此通用类型.

我可以通过声明一个强制子类返回该类型的抽象方法来实现.但有没有更优雅的方法直接从子类的'Class'对象定义实现这一点？

public class GenericTest {
    public static void main(String[]args) throws Exception{
        Class strClass = ClazzImplString.class;
        Class intClass = ClazzImplInteger.class;

        Class implTypeStr = ((AbsClazz)strClass.getConstructor().newInstance()).getGenericType();
        Class implTypeInt = ((AbsClazz)intClass.getConstructor().newInstance()).getGenericType();

        System.out.println("implTypeStr: " + implTypeStr);
        System.out.println("implTypeInt: " + implTypeInt);
    } 
}
abstract class AbsClazz<GenericType> {
    abstract Class getGenericType();
}

class ClazzImplString extends AbsClazz<String> {
    public ClazzImplString() {}    
    @Override  Class getGenericType() {return String.class;}
}
class ClazzImplInteger extends AbsClazz<Integer> {
    public ClazzImplInteger() {}    
    @Override Class getGenericType() {return Integer.class;}
}

先感谢您

我正在尝试使用CellStylesfor 来配置用于格式化的泛型.HSSFCellsApache-POI 3.11

这是代码的可运行示例.正确应用粗体和边框格式.问题在于背景和前景颜色.

我有什么不对的任何线索？

public class TestSO {

private final static short 
        MY_LIGHT_BLUE=100,
        MY_DARK_BLUE=101,
        MY_BLACK=102,
        MY_WHITE=103;

public static void main(String[]args) throws Exception{
    HSSFWorkbook workbook = new HSSFWorkbook();
    setPallete( workbook.getCustomPalette() );

    HSSFFont fontNormal = workbook.createFont();
    fontNormal.setFontHeightInPoints((short)11);
    fontNormal.setFontName("Calibri");
    HSSFFont fontBold = workbook.createFont();
    fontBold.setFontHeightInPoints((short)11);
    fontBold.setFontName("Calibri");
    fontBold.setBold(true);


    HSSFCellStyle titleStyle = workbook.createCellStyle();
    titleStyle.setFillBackgroundColor(MY_DARK_BLUE);
    titleStyle.setFillForegroundColor(MY_WHITE);
    titleStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    titleStyle.setFont(fontBold);
    setTopBotBorder(titleStyle);

    HSSFCellStyle fpStyle = workbook.createCellStyle();
    fpStyle.setFillBackgroundColor(MY_LIGHT_BLUE);
    fpStyle.setFillForegroundColor(MY_BLACK);
    fpStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    fpStyle.setFont(fontNormal);
    setTopBotBorder(fpStyle);

    HSSFSheet sheet = workbook.createSheet("Leyenda");

    HSSFCell cell;

    cell = sheet.createRow( 1 ).createCell( 1 );
    cell.setCellValue("TitleStyle"); …