LAB 3
TOPICS:
•Reading input using the Scanner class
•Methods of the String class
•The if statement
•Methods that accept parameters and return
values
Exercise 1:
•In BlueJ, create a new project called Lab3
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Lab report object oriented programming, Study Guides, Projects, Research of Cooperative Governance
Object-oriented programming (OOP) refers to a type of computer programming (software design) in which programmers define the data type of a data structure, and also the types of operations (functions) that can be applied to the data structure.
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2019/2020
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LAB 3
TOPICS:
- Reading input using the Scanner class
- Methods of the String class
- The if statement
- Methods that accept parameters and return
values
Exercise 1:
- In BlueJ, create a new project called Lab
Figure 1
- Create a class in that project called LotsOfStuff Figure 2
Exercise 2:
- Prompt the user to enter their first name. Use a print statement (instead of println) for the prompt so the user input will appear on the same line.
- Read the input using a call to nextLine of the Scanner object and store the value in a String variable called name
- Print a greeting as shown below (user input is shown in blue): Enter your first name: Bob Nice to meet you, Bob!
- Don't forget the exclamation point in the greeting. SOLUTION:
- Figure
Figure 5 OUTPUT: Figure 6
Exercise 4:
- Add a second if statement so that, if the name entered is "Bob", another line of output is produced: I've always liked you, Bob.
- Otherwise, print the following two lines using separate println statements: You're not Bob! But I like you anyway. SOLUTION: Figure 7 OUTPUT:
- IF THE INPUT IS BOB: Figure 8
SOLUTION: Figure 10 OUTPUT: Figure 11 Exercise 6:
- Modify the printPerimeter method so that it only computes and prints the perimeter if the input value is greater than 0.
- If it's not, print: The length must be positive. SOLUTION:
Figure 12 OUTPUT:
- IF THE OUTPUT IS POSITIVE: Figure 13
- IF THE OUTPUT IS NEGATIVE: Figure 14
Exercise 8: Instead of running the method directly through BlueJ, let's write one method that calls another. Write a method named caller (static, no parameters, no return value). In caller, call the computePerimeter method, passing it a value of 10, and print the result. Then call the computePerimeter method again from caller, passing it a value of 15, and print the result. Compile and run the caller method.
SOLUTION: Figure 16 OUTPUT: Figure 17