Remote Method Invocation - Java Questions & Answers

This set of Java Multiple Choice Questions & Answers (MCQs) focuses on “Remote Method Invocation (RMI)”.

1. What is Remote method invocation (RMI)?
a) RMI allows us to invoke a method of java object that executes on another machine
b) RMI allows us to invoke a method of java object that executes on another Thread in multithreaded programming
c) RMI allows us to invoke a method of java object that executes parallely in same machine
d) None of the mentioned
View Answer

Answer: a
Explanation: Remote method invocation RMI allows us to invoke a method of java object that executes on another machine.

2. Which of these package is used for remote method invocation?
a) java.applet
b) java.rmi
c) java.lang.rmi
d) java.lang.reflect
View Answer

Answer: b
Explanation: The package used for remote method invocation in Java is java.rmi. This package provides the necessary classes and interfaces to implement RMI in Java applications, enabling remote communication between client and server programs.

3. Which of these methods are member of Remote class?
a) checkIP()
b) addLocation()
c) AddServer()
d) None of the mentioned
View Answer

Answer: d
Explanation: Remote class does not define any methods, its purpose is simply to indicate that an interface uses remote methods.

4. Which of these Exceptions is thrown by remote method?
a) RemoteException
b) InputOutputException
c) RemoteAccessException
d) RemoteInputOutputException
View Answer

Answer: a
Explanation: All remote methods throw RemoteException.

5. Which of these class is used for creating a client for a server-client operations?
a) Client.java
b) ServerClient.java
c) both Client.java and ServerClient.java
d) None of the mentioned
View Answer

Answer: c
Explanation: The class used for creating a client for server-client operations is ServerClient.java or Client.java.

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6. Which of these package is used for all the text related modifications?
a) java.text
b) java.awt
c) java.lang.text
d) java.text.modify
View Answer

Answer: a
Explanation: java.text provides capabilities for formatting, searching and manipulating text.

7. What will be the output of the following Java code?

```
    import java.lang.reflect.*;
```
```
    class Additional_packages 
```
```
    {	 
```

         public static void main(String args[])

```
         {
```
```
	     try 
```
```
             {
```

	         Class c = Class.forName("java.awt.Dimension");

		 Constructor constructors[] = c.getConstructors();

		 for (int i = 0; i < constructors.length; i++)

		     System.out.println(constructors[i]);

```
	     }
```
```
	     catch (Exception e)
```
```
             {
```

             System.out.print("Exception");

```
             }
```
```
        }
```
```
    }
```

a) Program prints all the constructors of ‘java.awt.Dimension’ package
b) Program prints all the possible constructors of class ‘Class’
c) Program prints “Exception”
d) Runtime Error
View Answer

Answer: a
Explanation: getConstructors() Returns an array containing Constructor objects reflecting all the public constructors of the class represented by this Class object.
Output:

$ javac Additional_packages.java
$ java Additional_packages
public java.awt.Dimension(java.awt.Dimension)
public java.awt.Dimension()
public java.awt.Dimension(int,int)

8. What will be the output of the following Java code?

```
    import java.lang.reflect.*;
```
```
    class Additional_packages 
```
```
    {	 
```

         public static void main(String args[])

```
         {
```
```
	     try 
```
```
             {
```

	         Class c = Class.forName("java.awt.Dimension");

```
		 Field fields[] = c.getFields();
```

		 for (int i = 0; i < fields.length; i++)

```
		     System.out.println(fields[i]);
```
```
	     }
```
```
	     catch (Exception e)
```
```
             {
```

             System.out.print("Exception");

```
             }
```
```
        }    
```
```
    }
```

a) Program prints all the constructors of ‘java.awt.Dimension’ package
b) Program prints all the methods of ‘java.awt.Dimension’ package
c) Program prints all the data members of ‘java.awt.Dimension’ package
d) program prints all the methods and data member of ‘java.awt.Dimension’ package
View Answer

Answer: c
Explanation: getFields() Returns an array containing Field objects reflecting all the accessible public fields of the class or interface represented by this Class object.
Output:

$ javac Additional_packages.java
$ java Additional_packages
public int java.awt.Dimension.width
public int java.awt.Dimension.height

9. What is the length of the application box made in the following Java program?

```
    import java.awt.*;
```
```
    import java.applet.*;
```

    public class myapplet extends Applet

```
    {
```
```
        Graphic g;
```

        g.drawString("A Simple Applet",20,20);

```
    }
```

a) 20
b) Default value
c) Compilation Error
d) Runtime Error
View Answer

Answer: c
Explanation: To implement the method drawString we need first need to define abstract method of AWT that is paint() method. Without paint() method we cannot define and use drawString or any Graphic class methods.

10. What will be the output of the following Java program?

```
    import java.lang.reflect.*;
```
```
    class Additional_packages
```
```
    {	 
```

         public static void main(String args[])

```
         {
```
```
	     try
```
```
             {
```

	         Class c = Class.forName("java.awt.Dimension");

```
		 Method methods[] = c.getMethods();
```

		 for (int i = 0; i < methods.length; i++)

```
		     System.out.println(methods[i]);
```
```
	     }
```
```
	     catch (Exception e)
```
```
             {
```

             System.out.print("Exception");

```
             }
```
```
        }
```
```
    }
```

Answer: b
Explanation: getMethods() Returns an array containing Method objects reflecting all the public methods of the class or interface represented by this Class object, including those declared by the class or interface and those inherited from superclasses and superinterfaces.
Output:

$ javac Additional_packages.java
$ java Additional_packages
public int java.awt.Dimension.hashCode()
public boolean java.awt.Dimension.equals(java.lang.Object)
public java.lang.String java.awt.Dimension.toString()
public java.awt.Dimension java.awt.Dimension.getSize()
public void java.awt.Dimension.setSize(double,double)
public void java.awt.Dimension.setSize(int,int)
public void java.awt.Dimension.setSize(java.awt.Dimension)
public double java.awt.Dimension.getHeight()
public double java.awt.Dimension.getWidth()
public java.lang.Object java.awt.geom.Dimension2D.clone()
public void java.awt.geom.Dimension2D.setSize(java.awt.geom.Dimension2D)
public final native java.lang.Class java.lang.Object.getClass()
public final native void java.lang.Object.notify()
public final native void java.lang.Object.notifyAll()
public final native void java.lang.Object.wait(long)
public final void java.lang.Object.wait(long,int)
public final void java.lang.Object.wait()

Sanfoundry Global Education & Learning Series – Java Programming Language.

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