Java Reflection Resources

Question

Where can I find a document to understand about JAVA/Reflection like below code ?

Field.class.getDeclaredField("modifiers")

What is getDeclaredField does?

What is a term "modifiers" do ?

I have seen reflection code in action from here

Answer 1

From the javadoc which should be the first place you look when something is puzzling you.

Answer 2

What is getDeclaredField does?

The method getDeclaredField(String name)

Returns a Field object that reflects the specified declared field of the class or interface represented by this Class object.

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What is a term "modifiers" do ?

"modifiers" here represents the name of the field to retrieve, as stated into the javadoc:

The name parameter is a String that specifies the simple name of the desired field.

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To summarize Field.class.getDeclaredField("modifiers"), will get by reflection the field modifiers from the class Field.

 public final class Field extends AccessibleObject implements Member {
      ...
      private int                 modifiers; <-- this
      ...