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Java Basics
1/25
What does the 'transient' keyword signify in a Java class?
The variable can be serialized
The variable is thread-safe
The variable cannot be serialized
The variable is volatile
Next >
2/25
Which collection class in Java is synchronized?
ArrayList
LinkedList
Vector
HashSet
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3/25
Which interface in Java is used for sorting and ordering?
List
Set
Comparable
Comparator
Next >
4/25
What does the 'static' keyword in Java signify?
The method can be called without creating an instance of the class
The method is immutable
The method is synchronized
The method returns a static value
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5/25
How do you handle exceptions in Java?
Using try-catch blocks
By using the 'throws' keyword
By using the 'extends' keyword
By declaring them as static
Next >
6/25
In Java, what is the difference between '==' and 'equals()'?
'==' checks for value equality, 'equals()' checks for reference equality
'==' checks for reference equality, 'equals()' checks for value equality
There is no difference
'equals()' is used only for strings
Next >
7/25
How is a 'JFrame' used in Java?
To create a console-based application
To create a GUI window
To manage database connections
To store data in a file
Next >
8/25
Which method must be implemented in a class that implements the java.util.Comparator interface?
compare()
compareTo()
equals()
hashCode()
Next >
9/25
How do you declare a constant variable in Java?
Using the 'constant' keyword
Using the 'static final' keywords
Using the 'immutable' keyword
Declaring without initialization
Next >
10/25
What is the purpose of the 'instanceof' operator in Java?
To compare the performance of two objects
To determine if a specific object is an instance of a class, superclass, or interface
To instantiate a new object of a class
To check the equality of two objects
Next >
11/25
Which method is used to compare two strings for equality in Java?
compareTo()
equals()
equalsIgnoreCase()
compare()
Next >
12/25
What is the purpose of the 'volatile' keyword in Java?
To make a variable thread-safe by ensuring atomic access to it
To optimize the code during compilation
To indicate that a variable's value will not change
To store the variable value permanently in the database
Next >
13/25
How do you create a thread-safe singleton in Java?
Using double-checked locking
By making all methods synchronized
By declaring all variables as volatile
By using a static class
Next >
14/25
What does the 'throws' keyword do in Java?
Automatically handles an exception
Declares an exception which might be thrown
Stops the propagation of an exception
Increases the throw range of an exception
Next >
15/25
In Java, what is 'reflection' used for?
To modify the behavior of a program at runtime
To duplicate objects
To analyze the performance of applications
To convert primitive types into objects
Next >
16/25
Which method in the Object class is used to obtain a unique hash code for the object?
uniqueCode()
hashCode()
identityHashCode()
getObjectHash()
Next >
17/25
What is 'JDBC' in Java?
Java Database Connectivity, a standard API for database access
Java Data Binding Code, a framework for binding data to UI elements
Just-in-time Database Compiler, a tool for database optimization
Java Deployment and Compilation, a deployment tool
Next >
18/25
In Java, what does the 'transient' keyword do when applied to a class field?
Makes the field non-serializable
Marks the field as temporary and not part of the class's persistent state
Indicates that the field value can change rapidly
Makes the field volatile
Next >
19/25
What is 'encapsulation' in Java?
The technique of wrapping code and data together into a single unit
A process of linking a method with an object
A method of improving code execution time
The division of a program into smaller parts
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20/25
In Java, what is the function of the 'super' keyword?
To call a method of the superclass
To declare superior variables
To access the superclass's static methods
To create an object of the superclass
Next >
21/25
What is 'polymorphism' in the context of Java?
The ability of a variable to hold objects of different types
The ability of Java to run on different platforms without modification
The ability of a method to perform different tasks based on the object
Changing the behavior of an object at runtime
Next >
22/25
In Java, what is the purpose of the 'enum' keyword?
To define a new exception type
To declare a collection of constants
To create an enumeration of values for iteration
To optimize memory usage in large applications
Next >
23/25
In Java, which method would you use to compare two String objects for content equality?
compareTo()
equals()
match()
equalContent()
Next >
24/25
In Java, what is the default value of a boolean variable in a class?
true
false
null
0
Next >
25/25
What is the advantage of using a 'PreparedStatement' in JDBC?
Faster execution for repeated queries
Allows execution of dynamic queries only
Automatically closes database connections
Improves the UI of the application
Next >
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