Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED : Constructor « Reflection « Java Tutorial

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Java Tutorial » Reflection » Constructor 
7.3.5.Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTEDPrevious/Next
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import static java.lang.System.out;

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;

public class ConstructorAccess {
  public static void main(String... args) {
    try {
      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());
        }
      }

      // production code should handle this exception more gracefully
    catch (ClassNotFoundException x) {
      x.printStackTrace();
    }
  }

  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;
  }
}
7.3.Constructor
7.3.1.Get all constructors or by parameters
7.3.2.Demonstrates use of Constructor objects
7.3.3.A program that displays a class synopsis for the named class
7.3.4.Create new instance from Constructor
7.3.5.Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED
7.3.6.Load class with Class.forName
7.3.7.Call Private constructor
7.3.8.Get constructor by parameter type
7.3.9.Invoke a constructor which throws Exception
7.3.10.Passing a parameter to the constructor and calling a method dynamically
7.3.11.Getting a Constructor of a Class Object: By obtaining a list of all Constructors object
7.3.12.Getting a Constructor of a Class Object: By obtaining a particular Constructor object.
7.3.13.Get a compatible constructor for the given value type
7.3.14.Has Declared Constructor
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