In Java, what is the purpose of the `NullPointerException`?
A. To create JavaBeans
B. To execute SQL queries
C. To define JavaBean properties
D. It is thrown when an attempt is made to access an object that is null
Answer: Option D
A. To create JavaBeans
B. To execute SQL queries
C. To define JavaBean properties
D. It is thrown when an attempt is made to access an object that is null
Answer: Option D
A. Factory Method
B. Singleton
C. Builder
D. Prototype
In Java, which keyword is used to explicitly call the superclass constructor?
A. parent()
B. extends
C. this()
D. super()
What is the output of the following code snippet in Java? `System.out.println("5 + 2 = " + 5 + 2);`
A. 5 + 2 = 7
B. 7
C. 5 + 2 = 52
D. Compilation Error
What is the purpose of the `hashCode()` method in Java's Object class?
A. To execute SQL queries
B. To return a unique identifier for an object
C. To create JavaBeans
D. None of These
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