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  1. import java.io.InputStream;
  2. import java.lang.reflect.Constructor;
  3. import java.util.HashMap;
  4. import java.util.Map;
  5.  
  6. class Foo
  7. {
  8.     Foo(String s, int i, InputStream is, boolean bool)
  9.     {
  10.         System.out.println();
  11.     }
  12. }
  13.  
  14. class Ideone
  15. {
  16. 	private static final Map<Class<?>, Object> defaultArguments = new HashMap<>();
  17.  
  18.     static
  19.     {
  20.         defaultArguments.put(boolean.class, false);
  21.         defaultArguments.put(short.class, 0);
  22.         defaultArguments.put(byte.class, 0);
  23.         defaultArguments.put(int.class, 0);
  24.         defaultArguments.put(char.class, 'A');
  25.         defaultArguments.put(long.class, 0);
  26.         defaultArguments.put(float.class, 0);
  27.     }
  28.  
  29.     private static Object[] getFakeArguments(final Constructor<?> constructor)
  30.     {
  31.         final Object[] args = new Object[constructor.getParameterCount()];
  32.         final Class<?>[] parameterTypes = constructor.getParameterTypes();
  33.         for (int i = 0; i < parameterTypes.length; ++i)
  34.         {
  35.             // Use null for objects
  36.             args[i] = defaultArguments.getOrDefault(parameterTypes[i], null);
  37.         }
  38.         return args;
  39.     }
  40.  
  41.  
  42.  
  43.     public static void main(String[] args) throws Exception
  44.     {
  45.         Class<?> clazz = Foo.class;
  46.         // the actual constructor doesn't matter, just get the first one
  47.         final Constructor<?> constructor = clazz.getDeclaredConstructors()[0];
  48.         Foo foo = (Foo) constructor.newInstance(getFakeArguments(constructor));
  49.         // foo.executionPrecedence();
  50.     }
  51. }
Success #stdin #stdout 0.06s 2184192KB
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Standard input is empty
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language:

						
Java (HotSpot 12)

					

					

						
created:
								
						
6 years ago

					

					

						
visibility:

						

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