Fluent Essays

TOPICS1.basic java syntax2.eclipse IDE3.storing and manipulate data4.basic input/output Programming Fundamentals Lab #1 Topics • Basic Java syntax • Eclipse IDE • Storing and Manipulating Data • Basic Input/Output Concepts println class, main comments string concatenation escape sequences variable declarations, init, assignment constants primitive data types arithmetic expressions (++,--,%,/,+,-,*,+=,-=,...) data conversions (casting) Scanner, System.in nextLine,nextInt,nextDouble Exercise 1 Use the "Eclipse IDE Tutorial" posted on BlackBoard to enter, compile, and run the following application: public class Lab1Ex1 { public static void main(String[] args) { System.out.println("Hello World"); } } After you are done, try to do the following and predict what will happen: a) Change Lab1Ex1 to Hello b) Remove the first quotation mark in the String c) Remove the semicolon d) Remove the last brace in the program For each part, try to recompile and run your program. Note the error you are getting. Then fix the error by reversing what you did and rerun the program. Then try the next part. Exercise 2 Make a Java program called GradeAvg that: 1. Creates 7 double variables named the following way: quizScore1, quizScore2, quizScore3, testScore1, testScore2, quizScoreAvg, and testScoreAvg 2. Initializes those variables to % scores (make up some numbers between 0 and 100). 3. Initializes each to the corresponding average by using an appropriate expression. 4. Prints out the values of the variables containing the averages. Make sure to label each value. Exercise 3 Create a new Java program called AgeGuess which 1. Creates a new Scanner object 2. Declares two variables: String name; int ageGuess; 3. Uses the Scanner object’s methods to read in the name and ageGuess from the keyboard. Make sure to prompt the user for each value. The value entered should be on the same line as the prompt. 4. Displays the ageGuess and name variable values. Make sure to label each. Exercise 4 Create a new Java program called TimeComp that reads a value representing a number of seconds, and then prints the equivalent amount of time as a combination of hours, minutes, and seconds. For example, 9999 seconds is equivalent to 2 hours, 46 minutes, and 39 seconds. Programming Fundamentals Lewis University TUTORIAL: How to Get Started Programming with Java in Eclipse IDE 1. Download and install the Java Development Kit (JDK). https://www.oracle.com/technetwork/java/javase/downloads/index.html 2. Download and execute Eclipse IDE for Java Developers. https://www.eclipse.org/downloads/packages/ 3. Close the Welcome screen. https://www.oracle.com/technetwork/java/javase/downloads/index.html https://www.eclipse.org/downloads/packages/ 4. Right-click on the empty area in the Package Explorer window and hover with your mouse over New…Java Project. Then click it to make a new project. 5. After the New...Java Project window opens, enter the name of your project (e.g. “MyFirstProject”). Also, make sure that “Use an execution environment JRE” is set to “JavaSE-1.8”. This is the version of Java we will use in class. Then click on “Finish”. 6. After the project gets created, you should see its name in the Package Explorer window. Click on the triangle next to the name to expand the contents. It displays any folders and files that are associated with this project. Right-click on “src” then hover over New..Class. Then click it to add a new class to your project. 7. In the New Java Class window, enter the name of your class (e.g. MyProgram) and make sure “public static void main(String[] args)” is selected. Note that class names should be in title case. Click finish to add the class to your project. 8. You should now see the following: You are now ready to add code your class. When you execute a program, it will run the class with the main method. You can remove this comment: “// TODO Auto-generated method stub”. Replace it with your program code. 9. For example, this code computes the area of a circle for a radius of 10: double radius = 10.0; double areaOfCircle = Math.PI * Math.pow(radius, 2); System.out.println("Area of the circle is " + areaOfCircle); After entering this code in the main method body, you can execute it by going to Run..Run or hitting CTRL+F11 (use command on the Mac). The output will show in the Console window on the bottom, as shown below: TUTORIAL: How to Get Started Programming with Java in Eclipse IDE