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Questions and Answers
Rearrange the following code so that it forms a correct program that prints out the letter Q:
Rearrange the following code so that it forms a correct program that prints out the letter Q:
public class Q { public static void main(String[] a) { System.out.println("Q"); } }
Write a statement that prints Hello, world to the screen.
Write a statement that prints Hello, world to the screen.
System.out.println("Hello, world");
Write a complete main method that prints Hello, world to the screen.
Write a complete main method that prints Hello, world to the screen.
public static void main(String[] args) { System.out.println("Hello, world"); System.exit(0); }
Suppose your name was Alan Turing. Write a statement that would print your last name, followed by a comma, followed by a space and your first name.
Suppose your name was Alan Turing. Write a statement that would print your last name, followed by a comma, followed by a space and your first name.
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Suppose your name was George Gershwin. Write a complete main method that would print your last name, followed by a comma, followed by a space and your first name.
Suppose your name was George Gershwin. Write a complete main method that would print your last name, followed by a comma, followed by a space and your first name.
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Write a complete program whose class name is Hello and that displays Hello, world on the screen.
Write a complete program whose class name is Hello and that displays Hello, world on the screen.
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The rules that govern the correct order and usage of the elements of a language are called the _______ of the language.
The rules that govern the correct order and usage of the elements of a language are called the _______ of the language.
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The standard name of the Java compiler is _______.
The standard name of the Java compiler is _______.
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A compiler translates source code into _______.
A compiler translates source code into _______.
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The import statement needed to use JOptionPane is _______.
The import statement needed to use JOptionPane is _______.
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Given an integer variable count, write a statement that displays the value of count on the screen.
Given an integer variable count, write a statement that displays the value of count on the screen.
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Two variables, num and cost have been declared and given values. Write a single statement that outputs num and cost to standard output.
Two variables, num and cost have been declared and given values. Write a single statement that outputs num and cost to standard output.
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Declare an integer variable named degreesCelsius.
Declare an integer variable named degreesCelsius.
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Declare two integer variables named profitStartOfQuarter and cashFlowEndOfYear.
Declare two integer variables named profitStartOfQuarter and cashFlowEndOfYear.
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Study Notes
Java Program Structure
- A basic Java program requires a class definition, typically starting with
public class ClassName. - The main method is the entry point of the Java application:
public static void main(String[] args). - To print output on the screen, use
System.out.println("Your text").
Printing Statements
- Use
System.out.println("Hello, world")to print "Hello, world" to the screen. - To print custom text such as names, format using string concatenation:
System.out.println("LastName, FirstName").
Compiler and Syntax
- The Java compiler is called
javac, which translates source code into executable code. - Syntax refers to the rules that dictate the correct structure and order of elements in the Java language.
Variable Declaration
- Declare variables using the syntax:
dataType variableName;. - Example declarations:
-
int degreesCelsius;for an integer variable. - Multiple variables can be declared in sequence:
int profitStartOfQuarter; int cashFlowEndOfYear;.
-
Import Statements
- Use
import javax.swing.JOptionPane;to enable the use of the JOptionPane class for dialogue boxes in a Java program.
Output Formatting
- To display multiple variables in a single line, use string concatenation:
System.out.println(num + " " + cost);. -
System.out.println(count);outputs the value of an integer variablecountwithout any additional text.
Program Termination
- Use
System.exit(0);at the end of the main method to indicate successful termination of the program.
Studying That Suits You
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Description
Test your knowledge on basic Java programming concepts with these flashcards. The quiz includes exercises on printing statements and structuring a simple Java program. Perfect for beginners looking to solidify their understanding of Java syntax.
