Core java interview preparations-Links

These are my notes on Core java while i was preparing for interviews. As you know core java holds an important percentage of questions in a technical interview. Here i am listing all the important portions of core java and corresponding links. The difficulty level is above average and i am not listing the basic topics. This will be helpful to you if you have basics of java and prepare for a technical interview or something.Lets start !

Before that if you want to have general reading about java concepts then read : Link & Link

• Volatile variable Click here & more details here

Special case of long & double with volatile keyword - here

• Thread vs process - here

• Transient variable Click here

• How HashMap works ?

This is an important topic for technical interviews ,

Click here 1

         Click here 2

• Iterator and Enumeration Click here

• Enum and Enumeration Click here

• Singleton design pattern Click here & Here

• Singleton without static keyword Click here

• Singleton with enum Click here

• Executor framework

This link provides all the concurrent util methods of java.

• Count down latch and cyclic barrier See here

• Interface and abstract classes Ckick here

• Everything about thread See here all the 4 parts

• Factory and Abstract factory Design pattern check this and this & this

• Serialization Check this and this too

• Why not static + transient ? Check this

• Difference between Externalizable & Serializable Check this

• If two objects are equal by equals() method then there hashcode must be same.

• Two object which is logically equal but loaded from different ClassLoader cannot be equals. see Details
• Implement HashSet with HashMap See here
• synchronize keyword in java see here

• Mixing static and non static synchronized method - Java mistake  Check

• Fail-fast and Fail-safe iterators See more

• TreeMap - sorted keys See more

• Why multiple inheritance is not supported in java - Diamond problem

• Association, Aggregation, Composition, Abstraction, Generalization  See here

• Iterating over a HashMap Check this out

• Java Memory Management Check

• Notify and NotifyAll See more

• Can you override private or static method in Java ? Answer

• Exceptions + overriding See here

• How do you ensure N thread can access N resources without deadlock Check

• Difference between JIT and Compiler See here,here and here

• Cloneable ? Difference between deep and shallow clone ? Check this and this

• Bitwise operations in java Here

• Memory leaks in java Check it

• Exceptions   See here

• How synchronize block works - read barrier and write barrier Check

• 25 java questions ( see 19th specially )  Here you go

These are the core java portions to be prepared before you go for a technical interview, especially if you are having experience.