Interview Questions and Answers for 'L' | Search Interview Question

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Q691. Write a program that count the number of access to a method?

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Q692. What is a weak reference ?

Core Java

Ans. A weak reference is a reference that gets removed on the next garbage collection cycle.

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Q693. What are the disadvantages of immutability ?

Design

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Q694. What is the programming advantage of Immutability ?

Design

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Q695. What is Snowflake ?

Snowflake

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Q696. What is mparticle ?

Mparticle

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Q697. How many Java developers are there in world ?

General

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Q698. Can we have a private default method ?

Core Java

Ans. No. The whole idea of default method is to provide a default definition in case the implementing class intend to provide definition for only some of the methods. Making any of the interface method private would restrict it from being implemented by the implementing class. So default method is an option to provide implementation and not restricting a new definition.

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Q699. What could be the reason for allowing private methods in java 9 ?

Core Java

Ans. Java 8 allowed for method implementation using default methods in interfaces. As those default methods could contain complex logic and might need organizing the logic into multiple methods, they have allowed for private methods.

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Q700. What is JShell?

Core Java

Ans. JShell is a feature in java 9 using which we can code and test without compiling using javac and see the result of calculations directly.

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Q701. How Java 9 would help resolve NoClassDefFoundError through it's modularity ?

Core Java

Ans. Java 9 would provide an error at compile time if there are different modules with the same package mapped to the same class loader and hence would provide a compile time check for this issue.

NoClassDefFoundError exists because of ambiguity at realtime because of multiple versions of same package / class exist. As Java 9 would provide a compile time check for it through clearly defined dependencies and exports and a check on duplicate packages being loaded by single class loader, it will fix the problem.

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Q702. What is the default setting for Automatic modules regarding exporting packages and reading modules ?

Core Java

Ans. As one purpose of automatic module is to provide backward compatibility with the module less dependencies, automatic modules exports all packages and include all other modules.

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Q703. How does Java 9 provides backward compatibility with libraries that haven't published themselves as modules ?

Core Java

Ans. Though Automatic modules. Any JAR on the module path without module descriptor ends up as automatic module

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Q704. How does modularity in Java 9 facilitates better encapsulation ?

Core Java

Ans. By providing dependencies , services and exports explicitly

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Q705. What are the qualified and unqualified packages ?

Core Java

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Q706. Does Java 9 allows same package within different modules ?

Core Java

Ans. Yes it allows if the modules are mapped to different class loaders.

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Q707. What is the use of Requires, Exports, Opens and provides within Module Descriptor ?

Core Java

Ans. Requires specifies the dependencies for the module, i.e the modules required for this module to function.

Exports specifies the packages exported by the module.

Opens specifies the packages opened by the module.

Provides specifies the services provided by the module

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Q708. Difference between named and unnamed modules ?

Core Java

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Q709. What is ModuleLayer ?

Core Java

Ans. A Module layer is created from a graph of modules and is a function that maps modules to their class loaders.

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Q710. What is ModuleDescriptor ?

Core Java

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Q711. Do we need different class loaders for different modules in Java 9 ?

Core Java

Ans. No, We can use the same class loader.

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Q712. How Java 9 helps in building light weight applications ?

Core Java

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Q713. How modules are different than packages in Java 9 ?

Core Java

Ans. Modules are independently build units and contains multiple packages.

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Q714. What is the concept of modules in Java 9 ?

Core Java

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Q715. Why do we have multiple core java jars in java 9 ?

Core Java

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Q716. What will the following code print and Why

class Class1 {
static{
System.out.println("Wow");
}
public static final int xyz=1;
}

class Class2{
public static void main(String[] args) {
System.out.println(String.valueOf(Class1.xyz));
}
}

Core Java

Ans. 1

Reason being that Class1.xyz is replaced with 1 during pre compilation only and a reference to Class1 is never made.

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Q717. Explain toString method ? Which class contains this method ?

Core Java

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Q718. Can you write critical section code for singleton design pattern ?

Design

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Q719. Which are the thread safe / synchronized / concurrent classes in java collections ?

Core Java

Ans. Stack
Properties
Vector
BlockingQueue
ConcurrentMap
ConcurrentNavigableMap

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Q720. Write code to read data from a file and write it to a file with 2 threads using the thread name content

Core Java

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