Introduction to Java Week 1

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Questions and Answers

What file type do you write in IntelliJ?

HelloWorld.bytecode

HelloWorld.txt

HelloWorld.class

HelloWorld.java (correct)

What is the role of the javac compiler?

To interpret Java bytecode at runtime

To convert Java bytecode into a human-readable format

To translate Java source code into Java bytecode (correct)

To run the Java Virtual Machine

What does the JVM do with Java bytecode?

It translates Java bytecode to a different higher-level language

It executes Java bytecode directly (correct)

It compiles Java bytecode into machine code

It converts Java bytecode to a text file

At which stage does a translator convert a human-readable language to bytecode?

Compile time Signup and view all the answers

Why does Java require a different JVM for each operating system?

Because each OS has a unique way of handling bytecode Signup and view all the answers

Which programming paradigm is introduced in this course?

Object-oriented programming Signup and view all the answers

What is taught about arrays in this course?

Working with both arrays and array lists Signup and view all the answers

What is a characteristic of low-level programming languages?

They interact directly with memory and registers. Signup and view all the answers

Which of the following programming languages is classified as high-level?

C Signup and view all the answers

Which aspect makes programming in binary challenging?

It can lead to numerous errors and is hard to proofread. Signup and view all the answers

What does the instruction 'SNA' do in assembly language?

Skips the next instruction if a specific condition is met. Signup and view all the answers

What is one reason assembly language is considered easier to read than binary?

It utilizes simple commands instead of long binary strings. Signup and view all the answers

Which command in assembly language is used to halt the execution?

HLT Signup and view all the answers

What is a common feature of high-level programming languages like C and Java?

They provide a higher level of abstraction from hardware. Signup and view all the answers

Which of the following best describes the transition from low-level to high-level programming?

Increased ease of programming and improved readability. Signup and view all the answers

What does the 'public static void main(String[] args)' represent in a Java program?

A method that serves as the starting point for execution Signup and view all the answers

What is the purpose of 'System.out.println()' in Java?

To display output to the console Signup and view all the answers

Which line of code properly combines a variable and text for output?

Both B and C are correct. Signup and view all the answers

What will be the output of 'System.out.println("Andy is " + out + " years old");' if out is set to 35?

Andy is 35 years old Signup and view all the answers

How does 'System.out.print()' differ from 'System.out.println()'?

println() starts a new line, print() does not Signup and view all the answers

In the context of the provided code, what is the value of 'answer' after 'number1' is 1.0 and 'number2' is 2.0?

0.5 Signup and view all the answers

What Java data types are used in the provided programs for numerical operations?

int and double Signup and view all the answers

What will be displayed by 'System.out.println("Result" + out);' if 'out' is assigned the value 33?

Result33 Signup and view all the answers

Which of the following statements is true about variable declaration in Java?

Variable names cannot start with a number. Signup and view all the answers

What is the output of the following code? 'System.out.print("Result"); System.out.print("Result");'

ResultResult Signup and view all the answers

What is the purpose of the main method in a Java program?

It is where all Java programs start. Signup and view all the answers

What must always be done when opening a block of code with curly brackets in Java?

Close the block with another curly bracket. Signup and view all the answers

In the provided Java code, how is the full name constructed?

By adding the two string variables. Signup and view all the answers

Which of the following is NOT a part of the basic syntax rules in Java?

Methods can only contain integer types. Signup and view all the answers

What represents the start of a Java program's execution?

The main method. Signup and view all the answers

Study Notes

Course Introduction

Course covers fundamentals of Java programming.
No mandatory textbook; optional recommendations include "On Java 8" by Bruce Eckel and "Effective Java" by Joshua Bloch.
Individual assignments, quizzes, and exam included in the coursework.
Great for beginners, career advancement in IT, or as a refresher.

Module Structure

Dr. Yushan Pan is the module leader for Weeks 1 to 3.
Other instructors include Dr. Erick Puranto, Dr. Haiyang Zhang, and Dr. Chengtao Ji.
Week 7 is a reading week; Week 8 includes a coursework test.

Course Content Overview

Topics include:
- Introduction to Java and object-oriented programming concepts.
- Syntax, custom classes, and methods.
- Test-driven development and unit testing.
- Generating code documentation in IntelliJ.
- Using arrays and array lists, method overloading.

Java Fundamentals

Java programs are written in .java files (Java source code).
Compiled to .class files (Java bytecode) by the javac compiler.
Java Virtual Machine (JVM) interprets bytecode on any operating system.
Independent of hardware, enhancing portability across platforms.

Programming Language Hierarchy

Programming languages range from low-level (binary, assembly) to high-level (Java, C, C#).
Low-level languages are closer to machine code, harder to read and write, while high-level languages offer abstraction.

Java Program Structure

Java commands must end with a semicolon.
Code blocks and method codes are enclosed in curly brackets.
Main method (public static void main(String[] args)) is the entry point for any Java program.

Example Java Programs

Basic syntax demonstrated through programs adding and dividing numbers.
Console output achieved with System.out.println() for both variables and text.
Distinction between println() (writes to a new line) and print() (continues on the same line).

Data Types and Variables

Supports various data types like int, double, and String.
Variable declarations and initializations are essential for program execution.
Concatenation of strings and variables can be performed for output formatting.

Console Output

Outputs can combine text, variables, and multiple variables with clear space management.
Users can utilize print and println interchangeably, noting that println adds a newline.

Summary Recap

The course introduces core Java concepts, aligns with practical programming in IntelliJ, and covers the computation process from JVM operations to binary handling.

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Description

Kickstart your journey into Java programming with this Week 1 quiz that covers the course introduction, syllabus, and tips for success. Get acquainted with the course layout and learn about the instructor's background in Informatics. Perfect for students eager to dive into Object-Oriented Programming!