Java Fundamentals and Import Statements

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Questions and Answers

What is the correct index range for accessing elements in an array?

0 to arrayRefVar.length

1 to arrayRefVar.length

0 to arrayRefVar.length-1 (correct)

1 to arrayRefVar.length-1

Which type of loop enables you to traverse an array sequentially without using an index variable?

enhanced for loop (for-each loop) (correct)

for loop

do-while loop

while loop

What is a common programming error that occurs when accessing an array out of bounds?

IndexError

ArrayOutOfBoundsException

ArrayIndexOutOfBoundsException (correct)

SyntaxError

What error is it called when the first element in an array is mistakenly accessed with index 1 instead of 0?

Off-by-one error Signup and view all the answers

What is the entry point where a Java program starts when it is executed?

The main method Signup and view all the answers

What does the wildcard import in Java do?

Imports all the classes in a package Signup and view all the answers

What is the syntax for accessing modifers while defining a method in Java?

The first word is lowercase and the first letter of succeeding words is uppercase Signup and view all the answers

What is required for a value-returning method in Java?

A return statement Signup and view all the answers

What does an array variable actually contain in Java?

Reference to the array Signup and view all the answers

What does 'WORA' stand for in relation to Java?

Write once, run anywhere Signup and view all the answers

What is the correct range of indices for accessing elements in an array in Java?

0 to arrayRefVar.length-1 Signup and view all the answers

What is the error called when a programmer mistakenly accesses the first element in an array with index 1 instead of 0?

Off-by-one error Signup and view all the answers

What type of loop in Java enables you to traverse an array sequentially without using an index variable?

enhanced for loop (for-each loop) Signup and view all the answers

What is the common programming error that occurs when accessing an array out of bounds in Java?

ArrayIndexOutOfBoundsException Signup and view all the answers

Which statement accurately describes the camel casing convention used in Java?

The first word is lowercase and the first letter of succeeding words is uppercase Signup and view all the answers

In Java, what is the role of the main method?

It is the entry point where the program starts when it is executed Signup and view all the answers

What is the purpose of using the wildcard import in Java?

To import all classes from a package Signup and view all the answers

What is the syntax for declaring an array variable in Java?

elementType[] arrayName; Signup and view all the answers

What does the 'WORA' principle stand for in Java?

Write Once, Run Anywhere Signup and view all the answers

What happens when you invoke a method with a parameter in Java?

The parameter's value is passed to the argument Signup and view all the answers

Study Notes

Array Indexing and Access

The correct index range for accessing elements in an array is from 0 to length-1.
Accessing an array out of bounds is a common programming error.
This error is known as an ArrayIndexOutOfBoundsException.

Looping and Array Traversal

A for-each loop enables you to traverse an array sequentially without using an index variable.

Java Basics

The entry point where a Java program starts when it is executed is the main method.
The main method plays a crucial role in Java, serving as the entry point for program execution.

Importing and Modifiers

The wildcard import in Java allows you to import all classes and interfaces from a specific package.
The syntax for accessing modifiers while defining a method in Java is public/private/protected static void-return-type method-name().
A value-returning method in Java requires a return statement.

Array Variables and WORA

An array variable in Java contains a reference to the array, not the actual array elements.
'WORA' stands for "Write Once, Run Anywhere", which is a fundamental principle in Java, enabling platform independence.

Method Invocation and Parameters

When you invoke a method with a parameter in Java, the parameter value is passed to the method.

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Description

Test your knowledge of Java fundamentals such as class definitions and the main method, as well as different types of import statements. Learn about the platform-independent nature of Java and the 'write once, run anywhere' principle.