我已经建立了这种数据枚举:
enum Sexo {
HOMBRE("H"), MUJER("M"), OTRO("O");
private String sexo;
private Sexo(String sexo){
System.out.println("constructor del tipo enum");
this.sexo=sexo;
}
}
然后,在Main方法中,我只是这样做:
public static void main(String[] args) {
Sexo sexo1 = Enum.valueOf(Sexo.class, "HOMBRE");
Sexo sexo2 = Enum.valueOf(Sexo.class, "MUJER");
Sexo.valueOf("OTRO");
}
然后,我在控制台上找到它:
constructor del tipo enum
constructor del tipo enum
constructor del tipo enum
我知道我对每个枚举类型都有一个构造函数的调用,而句子“ Sexo”(枚举类型的名称)。但: 为什么构造函数只运行一次?请注意,我有两个实例,一个直接调用该类。
答案 0 :(得分:3)
调用构造函数的方法不是protected Image readImage(String path, Display display) {
InputStream stream = ClassLoader.getSystemClassLoader().getResourceAsStream(path);
BufferedImage bi = null;
try {
bi = ImageIO.read(stream);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (stream != null)
stream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return new Image(display, convertToSWT(bi));
}
public static ImageData convertToSWT(BufferedImage bufferedImage) {
if (bufferedImage.getColorModel() instanceof DirectColorModel) {
DirectColorModel colorModel = (DirectColorModel) bufferedImage.getColorModel();
PaletteData palette = new PaletteData(
colorModel.getRedMask(),
colorModel.getGreenMask(),
colorModel.getBlueMask()
);
ImageData data = new ImageData(
bufferedImage.getWidth(),
bufferedImage.getHeight(), colorModel.getPixelSize(),
palette
);
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[3];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
raster.getPixel(x, y, pixelArray);
int pixel = palette.getPixel(
new RGB(pixelArray[0], pixelArray[1], pixelArray[2])
);
data.setPixel(x, y, pixel);
}
}
return data;
} else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
IndexColorModel colorModel = (IndexColorModel) bufferedImage.getColorModel();
int size = colorModel.getMapSize();
byte[] reds = new byte[size];
byte[] greens = new byte[size];
byte[] blues = new byte[size];
colorModel.getReds(reds);
colorModel.getGreens(greens);
colorModel.getBlues(blues);
RGB[] rgbs = new RGB[size];
for (int i = 0; i < rgbs.length; i++) {
rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF, blues[i] & 0xFF);
}
PaletteData palette = new PaletteData(rgbs);
ImageData data = new ImageData(
bufferedImage.getWidth(),
bufferedImage.getHeight(),
colorModel.getPixelSize(),
palette
);
data.transparentPixel = colorModel.getTransparentPixel();
WritableRaster raster = bufferedImage.getRaster();
int[] pixelArray = new int[1];
for (int y = 0; y < data.height; y++) {
for (int x = 0; x < data.width; x++) {
raster.getPixel(x, y, pixelArray);
data.setPixel(x, y, pixelArray[0]);
}
}
return data;
}
return null;
}
。
第一次使用该类时,将为每个文字调用valueOf
的构造函数。因此,在您的情况下,那就是在首次调用enum
之前。
对构造函数的三个调用是由三个文字引起的,而不是对Enum.valueOf
的三个调用。