What is the official version number format for Java from version 9 onward, according to the text?

Java 1.9, Java 1.10, Java 1.11, etc.

Java SE 9, Java SE 10, Java SE 11, etc.

Java 1.x, where x is the version number.

What is the reason mentioned for dropping the “1” prefix from version numbers starting from Java 5 onward?

To simplify the naming conventions.

To align with the common convention.

To make version numbers shorter.

What is the requirement for a class to be placed within a source code file?

It should be declared inside curly braces.

It should have a .class extension.

Where must methods be declared in Java?

Within curly braces of a class.

What is the required structure of the main method for a Java application?

public static void main(String[] args)

How many main methods should an individual Java application have?

One main method per application.

One main method per source code file.

What is the main() method's role in a Java program according to the text?

To execute the source code file.

How does a single-line comment start in Java?

Using two forward slashes (//).

With a backslash and an asterisk (/*).

What is the significance of white space in Java according to the text?

Most white space doesn't matter.

White space is essential for compilation.

White space is used for indentation only.

What is emphasized as a requirement for a conditional test in Java?

It should result in a boolean value.

It should include numerical values only.

In the context of looping, what is emphasized regarding a statement like 'While Bob keep scooping'?

It needs to include complex conditions.

What is a simple way to perform a boolean test in Java?

Checking the value of a variable with a comparison operator.

Why do some programmers accidentally type = instead of == in Java?

Due to lack of programming experience.

Intentional preference for = over ==.

Steam-driven compiler limitations.

Why does everything have to be in a class in Java?

Because Java is object-oriented (OO).

Due to a limitation in old compilers.

To enforce clean coding practices.

Requirement for conditional tests.

Do you have to put a main method in every class you write in Java?

No, only the main class requires a main method.

Yes, it is a strict requirement.

No, it depends on the program complexity.

Yes, but only for small programs.

In Java, can you perform a boolean test on an integer directly without using a comparison operator?

Only with the help of an if statement

What is emphasized regarding the compatibility of boolean and integer types in Java?

Compatibility depends on the version of Java.

Compatibility depends on the compiler.

How is a while loop described in terms of its execution and conditional test?

Runs everything in its block as long as the conditional test is true.

Runs everything in its block if the conditional test is false.

Runs everything after its block if the conditional test is false.

Runs only once regardless of the conditional test.

How is an 'else' condition utilized in Java according to the text?

To specify an alternative code block when the 'if' condition is false.

To define code blocks within an 'if' statement.

To add a newline in the output.

To switch between print and println statements.

What is the primary difference between System.out.print and System.out.println in Java?

Println inserts a newline, while print keeps printing to the same line.

Print and println are interchangeable.

Print and println both insert newlines.

Print keeps printing to the same line, while println inserts a newline.

When should you use System.out.println instead of System.out.print in Java according to the text?

When you want each thing you print out to be on its own line.

When you want everything to stick together on one line.

When you want to insert a newline after every statement.

When you want to print without any line breaks.

What does the text suggest about the difference between print and println statements?

The choice between print and println depends on the desired output format.

Print and println are identical.

Println is more efficient than print.

Print is more commonly used than println.

Why is Java still theoretically on version 1.x?

Because new versions are backward compatible, all the way back to 1.0.

To maintain a consistent versioning convention.

To avoid confusion with other programming languages.

To highlight the long history of Java development.

Java HF Chapter 1

Authored by Gulp Unbent

Computers

University

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is Java famous for regarding backward compatibility?

Old code can run happily on new JVMs

Old code requires complete rewriting

New code cannot run on old JVMs

Backward compatibility is not a concern

Answer explanation

Java is famous for its backward compatibility, allowing old code to run happily on new JVMs.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is mentioned as a characteristic of Java code in the "real world"?

Older coding styles

Only using the newest coding styles

No variation in coding styles

Complete absence of older code

Answer explanation

In the "real world," Java code often includes older coding styles.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the text mention about the growth of the Java API over the years?

It remained stagnant

No significant growth

It decreased

It grew enormously

Answer explanation

The Java API grew enormously over the years.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the best estimate provided for the number of lines of Java code written in the last 25 years?

100 trillion

50 billion

Over 17 gazillion

5 million

Answer explanation

The best estimate is that over 17 gazillion lines of Java code have been written in the last 25 years.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is one of Java's super-powers mentioned in the text?

High-speed execution

Memory optimization

Backward compatibility

Java Virtual Machine (JVM)

Answer explanation

Java's JVM can optimize code while it's running, contributing to its speed.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In terms of speed, how does Java compare to languages like C and Rust according to the text?

Java is faster than both C and Rust.

Java is slower than both C and Rust.

Java is as fast as C and Rust.

Java's speed is not mentioned in relation to C and Rust.

Answer explanation

Java is considered very fast, almost as fast as languages like C and Rust.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is mentioned as a downside of Java compared to languages like C and Rust?

Java lacks backward compatibility.

Java has a confusing versioning system.

Java is slower in terms of execution speed.

Java use lot of memory

Answer explanation

The text mentions that Java uses a lot of memory compared to C and Rust.

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Java HF Chapter 1

What is Java famous for regarding backward compatibility?

Java is famous for its backward compatibility, allowing old code to run happily on new JVMs.

What is mentioned as a characteristic of Java code in the "real world"?

In the "real world," Java code often includes older coding styles.

What does the text mention about the growth of the Java API over the years?

The Java API grew enormously over the years.

What is the best estimate provided for the number of lines of Java code written in the last 25 years?

The best estimate is that over 17 gazillion lines of Java code have been written in the last 25 years.

What is one of Java's super-powers mentioned in the text?

Java's JVM can optimize code while it's running, contributing to its speed.

In terms of speed, how does Java compare to languages like C and Rust according to the text?

Java is considered very fast, almost as fast as languages like C and Rust.

What is mentioned as a downside of Java compared to languages like C and Rust?

The text mentions that Java uses a lot of memory compared to C and Rust.

What is the official version number format for Java from version 9 onward, according to the text?

The official version number format from Java 9 onward is just the number, without the “1” prefix.

In this book, what convention will be used for version numbers from Java 1.0 to Java 1.4?

In this book, the convention used for version numbers is Java 1.0–1.4.

What is the reason mentioned for dropping the “1” prefix from version numbers starting from Java 5 onward?

The “1” prefix was dropped to simplify the naming conventions and align with the common convention.

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