Core Java and JDBC - QUIZ 1

What will be the output of the below statements?

public class Test {

public static void main(String[] args)
{
String s1 = null;
System.out.println(s1); //line 2
System.out.println(s1.toString()); //line 3
}
}

• a) null null

• b) null NullPointerException

• c) NullPointerException NullPointerException

• d) None

Which of the following methods is used to perform DML statements in JDBC?

• executeResult()

• executeQuery()

• executeUpdate()

• execute()

Which class is used to read text from the console in Java?

• a) SystemInReader
• b) ConsoleReader
• c) InputStreamReader
• d) Scanner

What is the output of the following Java program?

• a) 0 1 2
• b) 0 1 2 3 4
• c) 0 1
• d) 0 1 2 3 4 5

Which exception is thrown when a string cannot be converted to a numeric type?

• a) NumberFormatException
• b) ClassCastException
• c) IllegalArgumentException
• d) ArrayIndexOutOfBoundsException

Which package contains the JDBC API?

• java.jdbc

• java.db

• java.sql

• java.oracle

• java.mysql

What is the purpose of the join() method in Java?

• A. To pause the execution of the current thread
• B. To join two or more threads together
• C. To wait for a thread to complete its execution
• D. To terminate a thread

How do you load a JDBC driver in Java?

• a) Class.forName("driverClassName")

• b) Driver.load("driverClassName")

• c) DriverManager.loadDriver("driverClassName")

• d) Database.loadDriver("driverClassName")

Which of these can be contained in an interface?

• a) Abstract methods
• b) Constants
• c) Default and static methods
• d) All of the above

In Java, what concept allows us to implement runtime polymorphism?

• a) Method overloading
• b) Method overriding
• c) Constructors
• d) Static methods