Reflection

---------------------------------:Reflection:---------------------
compiler use reflection api for check declration syntax error and all.........., server,framwork, testing tool,debugging
JVM design from reflection because it use.. o arg constructor availabe or not etc
https://www.youtube.com/watch?v=mGsDVjbvzRU
how many way get the Class class object;
1- Class c=Class.forName("A");
2- A a=new A();
Class c=a.getClass():
3-Class c=A.class;

getField((public)even to super class ) vs getDeclaredField((private)on corresponding class)
   
in case of class.forNane("").newIntance(); inside newIntance method constructor fetching logic h
        public Object newInstance()
        throws InstantiationException, IllegalAccessException
    {
        if(System.getSecurityManager() != null)
        {
            checkMemberAccess(0, ClassLoader.getCallerClassLoader());
        }
        return newInstance0();
    }private Object newInstance0()
        throws InstantiationException, IllegalAccessException
    {
        Constructor constructor;
        if(cachedConstructor == null)
        {
            if(this == java/lang/Class)
            {
                throw new IllegalAccessException("Can not call newInstance() on the Class for java.lang.Class");
            }
            try
            {
                Class aclass[] = new Class[0];
                final Constructor c = getConstructor0(aclass, 1);
                AccessController.doPrivileged(new PrivilegedAction() {

                    final Constructor val$c;
                    final Class this$0;

                    public Object run()
                    {
                        c.setAccessible(true);
                        return null;
                    }            {
                this$0 = Class.this;
                c = constructor;
                super();
            }
                });
                cachedConstructor = c;
            }
            catch(NoSuchMethodException nosuchmethodexception)
            {
                throw new InstantiationException(getName());
            }
        }
        constructor = cachedConstructor;
        int i = constructor.getModifiers();
        if(!Reflection.quickCheckMemberAccess(this, i))
        {
            Class class1 = Reflection.getCallerClass(3);
            if(newInstanceCallerCache != class1)
            {
                Reflection.ensureMemberAccess(class1, this, null, i);
                newInstanceCallerCache = class1;
            }
        }
        return constructor.newInstance((Object[])null);
        InvocationTargetException invocationtargetexception;
        invocationtargetexception;
        Unsafe.getUnsafe().throwException(invocationtargetexception.getTargetException());
        return null;
    }
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one pacakage is java.lang.reflect package is there

Class is used to get metadata of class