Java tutorial
import static java.lang.System.out; import java.lang.reflect.Constructor; import java.lang.reflect.Modifier; public class Main { public static void main(String... args) throws Exception { Class<?> c = Class.forName(args[0]); Constructor[] allConstructors = c.getDeclaredConstructors(); for (Constructor ctor : allConstructors) { int searchMod = modifierFromString(args[1]); int mods = accessModifiers(ctor.getModifiers()); if (searchMod == mods) { out.format("%s%n", ctor.toGenericString()); out.format(" [ synthetic=%-5b var_args=%-5b ]%n", ctor.isSynthetic(), ctor.isVarArgs()); } } } private static int accessModifiers(int m) { return m & (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED); } private static int modifierFromString(String s) { if ("public".equals(s)) return Modifier.PUBLIC; else if ("protected".equals(s)) return Modifier.PROTECTED; else if ("private".equals(s)) return Modifier.PRIVATE; else if ("package-private".equals(s)) return 0; else return -1; } }