e584. retrieving a predefined color by name.txt

这里面包含了一百多个JAVA源文件

The Color class contains a number of predefined colors such as red and green. This example demonstrates how to retrieve one of these predefined colors using a string. For example, the predefined color java.awt.Color.red could be retrieved with the string "red". 
    // Returns a Color based on 'colorName' which must be one of the predefined colors in
    // java.awt.Color. Returns null if colorName is not valid.
    public Color getColor(String colorName) {
        try {
            // Find the field and value of colorName
            Field field = Class.forName("java.awt.Color").getField(colorName);
            return (Color)field.get(null);
        } catch (Exception e) {
            return null;
        }
    }