Java代码问题将十进制代码转换为十六进制？

Question

我在下面有Java代码演示,它给了我一些问题.

这是一个例子:

public class MyTest 
{
    public static void main(String as[])
    {
        String ColorHex="#4EB3A2";
        int RedColor = Integer.parseInt(ColorHex.substring(1,3), 16);
        int GreenColor = Integer.parseInt(ColorHex.substring(3,5), 16);
        int BlueColor = Integer.parseInt(ColorHex.substring(5,7), 16);
        int finalColorValue = 65536 * RedColor + 256*GreenColor + BlueColor;
        int ColorDecimal=finalColorValue;
        int red = ColorDecimal % 256;
        ColorDecimal = ( ColorDecimal - red ) / 256;
        int green = ColorDecimal % 256;
        ColorDecimal = ( ColorDecimal - green ) / 256;
        int blue = ColorDecimal % 256;
        ColorDecimal = ( ColorDecimal - blue ) / 256;

        String hex = String.format("#%02x%02x%02x", red, green, blue);
        System.out.println("hex"+hex);
    }
}

这hex应该是,#4EB3A2但它正在回归#a2b34e.我在这做错了什么？

Answer 1

以下解决了您的问题:

    String ColorHex="#4EB3A2";

    int RedColor = Integer.parseInt(ColorHex.substring(1,3), 16);
    int GreenColor = Integer.parseInt(ColorHex.substring(3,5), 16);
    int BlueColor = Integer.parseInt(ColorHex.substring(5,7), 16);

    int finalColorValue = 65536 * RedColor + 256*GreenColor + BlueColor;
    int ColorDecimal=finalColorValue;

    // Blue extracted first.
    int blue = ColorDecimal % 256;
    ColorDecimal = (ColorDecimal - blue ) / 256;

    int green = ColorDecimal % 256;
    ColorDecimal = (ColorDecimal - green ) / 256;

    int red = ColorDecimal % 256;
    ColorDecimal = (ColorDecimal - red ) / 256;

    String hex = String.format("#%02x%02x%02x", red, green, blue);
    System.out.println("hex" + hex);

说明:

Blue占用ColorDecimal中的最低字节,因此应首先从中提取它.