JAVA creating instance of nested static class with reflection

Question

I want to create an instance of nested static class with reflection. I have the following code:

if (Modifier.isStatic(nestedClass.getModifiers())) {
                //TODO - WRITE HERE SOMETHING
 } else {
    ctor = nestedClass.getDeclaredConstructor(outerClass);
    ctor.setAccessible(true);
    testInstance = ctor.newInstance(outerInstance);
 }

but cant figure out what to do within the if statement. Some help or advice would be appreciated. Thanks.

Just call the constructor - Class.newInstance.

Boris the Spider
– Boris the Spider

2015-01-03 12:29:34 +00:00
Commented Jan 3, 2015 at 12:29 — Boris the Spider
– Boris the Spider, Commented Jan 3, 2015 at 12:29

Pshemo · Accepted Answer · 2015-01-03 12:39:00Z

2

Nested static class doesn't require outer instance, so try doing the same as in else but remove outerClass and outerInstance from constructor's arguments.

ctor = nestedClass.getDeclaredConstructor();//no outer class in argument
ctor.setAccessible(true);
testInstance = ctor.newInstance();//no outer instance in argument

answered Jan 3, 2015 at 12:39

Pshemo

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SMA · Accepted Answer · 2015-01-03 12:30:34Z

0

Try something like:

Class<MyClass> nestedClass = MyClass.class;
if (Modifier.isStatic(nestedClass.getModifiers())) {
     MyClass instance = nestedClass.newInstance();
     System.out.println(instance);
}
Output:
MainClass$MyClass@1db9742

answered Jan 3, 2015 at 12:30

SMA

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1 Comment

TT8 Over a year ago

Thx. But, if the nestedClass is also private i get an exception. any way around it?

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