throws keyword + java

What is the parameter type of the off parameter in the write method in the Writerclass?

• int
• char
• String
• Exception

Answer explanation

The answer to this question is (A) int. The off parameter in the write method in the Writer class is an int value, which specifies the offset from which to start writing characters to the output stream. This can be seen in the image, where the off parameter is of type int.

What is the name of the method that is used to divide two numbers in the image?

• divide
• main
• System
• Exception

Answer explanation

The answer to this question is (A) divide. The divide method is used to divide two numbers in the image. This can be seen in the image, where the divide method is defined with two parameters, a and b.

Which of the following is the correct way to handle the exception in the image?

• Use a try-catch block.

• Use the throws keyword.

• Both try-catch block and throws keyword can be used.

• None of the above.

Answer explanation

The answer to this question is (C) Both try-catch block and throws keyword can be used. The image shows two options for handling the exception: using a try-catch block or using the throws keyword. Both options are valid and can be used to handle the exception.

What is the name of the exception that is being thrown in the image?

• ArithmeticException
• NullPointerException
• FileNotFoundException
• IOException

Answer explanation

The answer to this question is (A) ArithmeticException. The ArithmeticException exception is being thrown in the image. This can be seen in the image, where the throw keyword is followed by the name of the ArithmeticException class.

What is the output of the program in the image?

• Result of Division: 0

• java.lang.ArithmeticException: divide by zero

• Unreachable code

• None of the above

Answer explanation

The answer to this question is (C) Unreachable code. The program in the image will not print anything to the console. This is because the throw keyword is used to throw an ArithmeticException exception. The ArithmeticException exception is thrown when an attempt is made to divide by zero. When an exception is thrown, the program will stop executing the current line of code and will jump to the catch block of the first try-catch statement that surrounds the line of code where the exception was thrown. In the image, there is no try-catch statement that surrounds the line of code where the throw keyword is used. Therefore, the program will stop executing the current line of code and will exit.

What is the output of the program in the image?

• welcome to vote

• Exception in thread "main" java.lang.ArithmeticException: not valid

• rest of the code.

• None of the above

Answer explanation

The answer to this question is (B) Exception in thread "main" java.lang.ArithmeticException: not valid. The program in the image will throw an ArithmeticException exception because the age is less than 18. The ArithmeticException exception is thrown when an attempt is made to divide by zero. When an exception is thrown, the program will stop executing the current line of code and will jump to the catch block of the first try-catch statement that surrounds the line of code where the exception was thrown. In the image, there is no try-catch statement that surrounds the line of code where the throw keyword is used. Therefore, the program will stop executing the current line of code and will exit.

What is the purpose of the try-catch block in the image?

• To check if the age is valid.

• To print the message "welcome to vote" if the age is valid.

• To handle the ExceptionClass exception.

• None of the above.

Answer explanation

The answer to this question is (C) To handle the ExceptionClass exception. The try-catch block in the image is used to handle the ExceptionClass exception. The ExceptionClass exception is thrown when the age is not valid. The try-catch block will catch the ExceptionClass exception and will print the message "Invalid age" to the console.

What is the purpose of the throw keyword in the MyString class?

• To create a new InvalidStringException object.

• To throw an InvalidStringException exception.

• To print the message "Invalid string" to the console.

• To exit the program.

Answer explanation

The answer to this question is (B) To throw an InvalidStringException exception. The throw keyword in the MyString class is used to throw an InvalidStringException exception. The InvalidStringException exception is thrown when the length() method is called on a MyString object that has a length of zero.

What is the purpose of the throws keyword in the method(int i) method?

• To declare that the method(int i) method may throw an IllegalArgumentException exception.

• To throw an IllegalArgumentException exception.

• To print the message "Invalid argument" to the console.

• To exit the program.

Answer explanation

The answer to this question is (A) To declare that the method(int i) method may throw an IllegalArgumentException exception. The throws keyword in the method(int i) method is used to declare that the method(int i) method may throw an IllegalArgumentException exception. This means that the method that calls the method(int i) method must be able to handle the IllegalArgumentException exception or it will be propagated to the calling method.

What is the purpose of the throw keyword in the divideInt() method?

• To create a new IllegalArgumentException object.

• To throw an IllegalArgumentException exception.

• To print the message "Divinor cannot be zero!" to the console.

• To exit the program.

Answer explanation

The answer to this question is (B) To throw an IllegalArgumentException exception. The throw keyword in the divideInt() method is used to throw an IllegalArgumentException exception. The IllegalArgumentException exception is thrown if the value of the j parameter is equal to 0.