5 Minute JAVA Test

1.

Question: Given:

module broker{

exports org.broker.api;

provides org.broker.api.Broker with org.broker.api.MyBroker

}

Which of the following statements are correct?

Select 3 option(s)

This is not a valid service provider module because it does not contain appropriate requires clause for service definition.

It is not a good idea to include MyBroker and Broker in the same module because that allows the user of the service to inadvertantly depend on the implementation class.

This is not a valid service definition module because it provides the service instead of defining it.

Placing the org.broker.api package in a separate module named brokerapi would make it easy to install multiple provider modules.

Other modules can also provide implementations for org.broker.api.Broker service.

2.

Question: Identify correct statements regarding Java module system.

Select 1 option(s)

Module-info.java must list all packages that you want to add to that module.

The file in which module information is specified must be named moduleinfo.java.

Module information can also be specified using @Module annotation

Every class of a module must specify which module it belongs to either using @Module annotation or using a command line option.

The only information required in the file that specifies module information is the module name.

3.

Question: MOVE What is the result of compiling and running the following code?

public class TestClass{

static int si = 10;

public static void main (String args[]){

new TestClass();

}

public TestClass(){

System.out.println(this);

}

public String toString(){

return "TestClass.si = "+this.si;

}

Select 1 option(s)

None of the above.

It will print TestClass.si = 10

The class will not compile because you cannot override toString() method.

The class will not compile as si being static, this.si is not a valid statement.

It will print TestClass@nnnnnnnn, where nnnnnnnn is the hash code of the TestClass object referred to by 'this'.

4.

Question: Consider the following program...

class Super { }

class Sub extends Super { }

public class TestClass{

public static void main(String[] args){

Super s1 = new Super(); //1

Sub s2 = new Sub(); //2

s1 = (Super) s2; //3

}

Which of the following statements are correct?

Select 1 option(s)

It will not compile.

It will compile and run without any problems.

It will compile but WILL throw ClassCastException at runtime.

None of the above.

It will compile but MAY throw ClassCastException at runtime.

5.

Question: Which of the following are true about the "default" constructor?

Select 2 option(s)

It is provided by the compiler only if the class does not define any constructor.

It initializes instance as well as class fields of the class.

It initializes the instance members of the class.

It calls the no-args constructor of the super class.

It is provided by the compiler if the class does not define a 'no-args' constructor.

Free Online 5 Minute Java Test

Question: Given:

Question: Identify correct statements regarding Java module system.

Question: MOVE What is the result of compiling and running the following code?

Question: Consider the following program...

Question: Which of the following are true about the "default" constructor?

Question: Identify correct statements about the following code:

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