Explore topic-wise MCQs in Java Programming.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Java Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the output of this program?
import java.io.*;
 public class streams_Example
 {
 public static void main(String[] args) 
 {
 try
 {
 FileOutputStream FOS = new FileOutputStream("serial");
 ObjectOutputStream OOS = new ObjectOutputStream(FOS);
 OOS.writeDouble(1.5);
 OOS.flush();
 OOS.close();
 }
 catch(Exception e)
 {
 System.out.println("Serialization" + e);
 System.exit(0);
 }
 try 
 {
 float p;
 FileInputStream FIS = new FileInputStream("serial");
 ObjectInputStream OIS = new ObjectInputStream(FIS);
 p = OIS.readInt();
 OIS.close();
 System.out.println(p); 
 }
 catch (Exception e)
 {
 System.out.print("deserialization");
 System.exit(0);
 }
 }
 }
A. 1.07
B. 1.07321754E9
C. 1.07321
D. 2.07321754E9
E. None of these
Answer» C. 1.07321
Discussion
2.

What is the output of this program?
import java.io.*;
 public class serialization_Example
 {
 public static void main(String[] args) 
 {
 try 
 {
 Newclass obj1 = new Newclass("InterviewMania", -10, 3.2e20);
 FileOutputStream fos = new FileOutputStream("serial");
 ObjectOutputStream oos = new ObjectOutputStream(fos);
 oos.writeObject(obj1);
 oos.flush();
 oos.close();
 }
 catch(Exception e) 
 {
 System.out.println("Serialization" + e);
 System.exit(0);
 }
 try
 {
 int p;
 FileInputStream fis = new FileInputStream("serial");
 ObjectInputStream ois = new ObjectInputStream(fis);
 p = ois.readInt();
 ois.close();
 System.out.println(p); 
 }
 catch (Exception e)
 {
 System.out.print("deserialization");
 System.exit(0);
 }
 }
 }
 class Newclass implements Serializable
 {
	String str;
	int k;
	double q;
 Newclass(String str, int k, double q)
 {
 this.q = q;
 this.k = k;
 this.str = str;
	}
 }
A. Compilation error
B. Runtime error
C. InterviewMania
D. deserialization
E. None of these
Answer» E. None of these
Discussion
3.

What is the output of this program?
import java.io.*;
 public class serialization_Example
 {
 public static void main(String[] args) 
 {
 try 
 {
 Newclass obj1 = new Newclass("InterviewMania", -10, 3.2e20);
 FileOutputStream fos = new FileOutputStream("serial");
 ObjectOutputStream oos = new ObjectOutputStream(fos);
 oos.writeObject(obj1);
 oos.flush();
 oos.close();
 }
 catch(Exception e) 
 {
 System.out.println("Serialization" + e);
 System.exit(0);
 }
 try 
 {
 Newclass obj2;
 FileInputStream fis = new FileInputStream("serial");
 ObjectInputStream ois = new ObjectInputStream(fis);
 obj2 = (Newclass)ois.readObject();
 ois.close();
 System.out.println(obj2); 
 }
 catch (Exception e) 
 {
 System.out.print("deserialization" + e);
 System.exit(0);
 }
 }
 }
 class Newclass implements Serializable 
 {
	String str;
	int k;
	double p;
 Newclass (String str, int k, double p)
 {
 this.p = p;
 this.k = k;
 this.str = str;
	}
 }
A. Newclass@776ec8df
B. InterviewMania
C. Interview
D. Mania
E. None of these
Answer» B. InterviewMania
Discussion
4.

What will be printed to the output and written to the file, in the below program?
import java.io.*; 
public class FileOutputStreamExample
{ 
 public static void main(String args[])
 { 
 try
 { 
 FileOutputStream FOS = new FileOutputStream("D:  InterviewMania.txt"); 
 String str="Welcome to the Interview Mania."; 
 byte q[]=str.getBytes();//converting string into byte array 
 FOS.write(q); 
 FOS.close(); 
 System.out.println("Success"); 
 } catch(Exception e){System.out.println(e);} 
 } 
}
A. Only "Welcome to the Interview Mania"
B. Compile time error
C. "Success" to the output and "Welcome to the xInterview Mania"
D. Runtime error
E. None of these
Answer» D. Runtime error
Discussion
5.

What will be printed to the output and written to the file, in the below program?

A. Only "Welcome to the Interview Mania"
B. Compile time error
C. "Success" to the output and "Welcome to the xInterview Mania"
D. Runtime error
E. None of these
Answer» D. Runtime error
Discussion