一个字段的修饰符可能也现以下：
访问修饰符：public，protected，private；
管理运行时的修饰符：transient，volatile；
限制一个实例：static
禁止修改：final
注解：Annotations
如下：
import java.lang.reflect.Field;import java.lang.reflect.Modifier;import static java.lang.System.out;enum Spy { BLACK , WHITE }public class FieldModifierSpy { volatile int share; public int instance; class Inner {} public static void main(String... args) { try { Class<?> c = Class.forName(args[0]); int searchMods = 0x0; //0 for (int i = 1; i < args.length; i++) { searchMods |= modifierFromString(args[i]); } Field[] flds = c.getDeclaredFields(); out.format("Fields in Class '%s' containing modifiers: %s%n", c.getName(), Modifier.toString(searchMods)); boolean found = false; for (Field f : flds) { int foundMods = f.getModifiers(); // Require all of the requested modifiers to be present if ((foundMods & searchMods) == searchMods) { out.format("%-8s [ synthetic=%-5b enum_constant=%-5b ]%n", f.getName(), f.isSynthetic(), f.isEnumConstant()); found = true; } } if (!found) { out.format("No matching fields%n"); } // production code should handle this exception more gracefully } catch (ClassNotFoundException x) { x.printStackTrace(); } } private static int modifierFromString(String s) { int m = 0x0; if ("public".equals(s)) m |= Modifier.PUBLIC; else if ("protected".equals(s)) m |= Modifier.PROTECTED; else if ("private".equals(s)) m |= Modifier.PRIVATE; else if ("static".equals(s)) m |= Modifier.STATIC; else if ("final".equals(s)) m |= Modifier.FINAL; else if ("transient".equals(s)) m |= Modifier.TRANSIENT; else if ("volatile".equals(s)) m |= Modifier.VOLATILE; return m; }}
