Q1 · Java Basics
OOP in Java MCQs
OOP in Java Full Question Bank
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Q2 · JDBC
Which of the following JDBC components is used to handle communication with the database server?
Q3 · Java Basics
Which of the following is not a feature of Java?
Q4 · Event Handling
Which of the following is not an adapter class used in event handling?
Q5 · JDBC
Which of the following methods is used to execute a SELECT query in JDBC API?
Q6 · Exception Handling
Which of these keywords is not a part of exception handling?
Q7 · Java Basics
In which of the following packages does the Integer class exist?
Q8 · Java Basics
Which of the following is a Java compiler?
Q9 · Exception Handling
Which of the following keywords is used to throw an exception manually?
Q10 · Streams
Which of the following is not a byte stream input class?
Q11 · Operators
Which one of the following is a ternary operator?
Q12 · Java Basics
Which keyword is used to make a variable constant in Java?
Q13 · GUI
The method that returns a string associated with a GUI Button is:
Q14 · OOP
Which of the following is a type of polymorphism in Java Programming?
Q15 · OOP
Which of the following is a superclass of every class in Java?
Q16 · Applet
Which method is automatically called after the browser calls the init method?
Q17 · Java Basics
Which of the following packages is imported by default in Java?
Q18 · Event Handling
Which of the following is not a mouse event in Java?
Q19 · Java Basics
What is the first step in running the java program?
Q20 · Operators
What is the value of x after int x = 5; x += x++ + ++x; ?
Q21 · Java Basics
Which of the following is not a keyword in Java?
Q22 · Operators
Which of these operators can skip evaluating the right-hand operand?
Q23 · OOP
Which is a correct method for method overloading?
Q24 · OOP
What does the super keyword do?
Q25 · Exception Handling
What happens when no exception occurs in try block?
Q26 · Operators
Which one of the following is not a valid Java bitwise operator?
Q27 · Java Basics
Which of the following package stores all the standard java classes?
Q28 · Exception Handling
Which of these operator is used to generate an instance of an exception that can be thrown using throw?
Q29 · Strings
Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?
Q30 · Exception Handling
Which one of the following keywords is used to declare an exception?
Q31 · Arrays
Which of these is an incorrect array declaration?
Q32 · OOP
Which one of the following access specifiers is appropriate for members of a superclass to access only from subclass?
Q33 · Collections
Which one of the following is not a collection class defined in Java?
Q34 · GUI
Which one of the following is the container that doesn't contain a title bar and menu bar but can have other GUI components such as buttons and text fields?
Q35 · Java Basics
What is the size of char type in Java?
Q36 · Java Basics
Which of the following is not a keyword in Java?
Q37 · Java Basics
Which of the following methods is directly accessed without creating an object?
Q38 · Java Basics
Which of the following is not a valid declaration of a for loop?
Q39 · OOP
What is the process by which one object acquires all the properties and behaviors of another object?
Q40 · Exception Handling
Which of the following is an unchecked exception in Java?
Q41 · GUI
Which of the following class is defined in the javax.swing package?
Q42 · OOP
Which one of the following types of inheritance is implemented using interfaces in Java?
Q43 · Applet
Which one of the following methods is called only once during the runtime of your applet?
Q44 · OOP
What is the process by which we control which parts of a program can access members of a class?
Q45 · Java Basics
What is the return type of a constructor in Java?
Q46 · OOP
Which keyword is used to refer to the base class constructor from a subclass constructor in Java?
Q47 · Streams
Which of these class contains the methods used to write in a file?
Q48 · GUI
Which of the following function is used to generate the application's top-level window?
Q49 · Java Basics
Which of the following is not a primitive data type defined in Java?
Q50 · Input
Which function is used to get a single character from the Scanner?
Q51 · Java Basics
Which of the following is not a jumping statement in Java?
Q52 · Exception Handling
Which of the following is not a keyword used in exception handling?
Q53 · Java Basics
Which of the following is not a method of the Wrapper class?
Q54 · Strings
Which of these methods of class String is used to compare two string objects for their equality?
Q55 · Threads
What is the default value of the priority variables MIN_PRIORITY and MAX_PRIORITY?
Q56 · GUI
Which one of the following is not a Java Swing container?
Q57 · Threads
Which of these statements is incorrect about Thread?
Q58 · Serialization
Which of these is an interface in Java for control over serialization and deserialization?
Q59 · Strings
Which class is used for immutable strings?
Q60 · Threads
Which method is used to pause a thread for a while?
Q61 · Serialization
What is deserialization?
Q62 · Operators
If a = 10 and b = 6, then what will be the value of a ^ b in Java?
Q63 · OOP
Which of the following inheritance is not directly available in Java?
Q64 · OOP
Which of the following keywords is used to derive a child interface from a parent interface?
Q65 · Threads
What is the process when two or more threads need to access a shared resource, and they need a way to ensure that the resource is used by only one thread at a time?
Q66 · Streams
Which of the following classes is used to read data from a file in a character stream?
Q67 · Collections
Which of the following is not a method of Iterator?
Q68 · GUI
What is the name of the Swing control that normally displays one entry and acts as a dropdown list?
Q69 · Java Basics
Which method is used to convert a String to an Integer?
Q70 · GUI