Top 25 Java Basic Interview Questions for Freshers

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1.What is the most Important feature of java?

• Java is platform independent language.

2.What do you mean by Platform Independence?

• Platform Independence  you can run and compile program in one platform and can execute in any other platform.

3.What is JVM(Java Virtual Machine)?

• JVM is Java Virtual Machine which is a run time Environment for the compiled java class.

4.What is JIT Compiler?

• Just-In-Time(JIT) compiler is  used to improve the performance. JIT compiles parts of the byte code that have similar functionality at the same time,

5.Are JVM's Platform Independent?

•  JVM'S are not platform Independent. JVM'S are platform Specific.

6.What if main method declare as private?

• No,It will compile fine but in run time it will error like main method should be in public.cannot find main method.

7.What is platform?

• A platform is basically the hardware or software environment in which a program runs.
• There are two types of platforms software and hardware.
• Java provides software-based platform.

8.What all memory areas are allocated by JVM?

• Heap, Stack, Program Counter Register and Native Method Stack

9.What is the base class of all classes?

• java.lang.Object

10.What is javac ?

• It produces the java byte code from *.java file.
• It is the intermediate representation of your source code that contains instructions.

11.Can we mark constructors final?

• No, Constructor cannot be declared final.

12.What are two different ways to call garbage collector?

• System.gc() OR Runtime.getRuntime().gc().

13.Can we override a static method?

• No, we cannot override a static method. Static means class level.

14.Use of finalize() method in java?

•  finalize() method is used to free the allocated resource.

15.Is it possible to overload main() method of a class?

• Yes, we can overload main() method as well. 
• But every time public static main(String[] args) will be called automatically by JVM.
• Other methods need to call explicitly.

16. Does Java support operator overloading?

• Operator overloading is not supported in Java.

17.Can I declare a data type inside loop in java?

• Any Data type declaration should not be inside the loop. Its possible but not recommended.

18.List two java ID Es?

• 1.Eclipse, 2.Net beans and 3.IntelliJ

19.Can we inherit the constructors?

• No, we cannot inherit constructors. 
• We can call super class constructors from subclass constructor by using super() call.

20.Can this keyword be assigned null value?

• No, this keyword cannot have null values assigned to it.

21.Basic java interview programs for freshers 

• Check out these basic java programs for beginners
• Basic java programs for freshers

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