Chapter 7

Question 0

What is a user-defined method

Answer 0

Methods created by the user.

Question 1

What is a pre-defined method.

Answer 1

Methods already created for use.

Examples: Println; printf; showInputDialog

Question 2

Advantages of user defined method.

Answer 2

1. Allows you to reuse methods many times
2. Different people can work on different methods in the program simultaneously
3. Allows user to focus on one part of the program at a time.
4. Enhances readability of a program; reduces amount of code in program.

Question 3

What are the various pre-defined methods used to separate a person’s first and last name?

Answer 3

1. length
2. indexOf
3. subString

Question 4

What is the pre-defined method, length?

Answer 4

Tells you the number of characters in a given string.

strLen = name.length( );

Question 5

What is the pre-defined method, indexOf?

Answer 5

Returns the location of the parameters entered into the method.

Example: we use a “space” when separating first and last names

spaceLoc = name.indexOf(“_”);

Question 6

What is the pre-defined method substring?

Answer 6

Extracts a string from within a string

Example:
firstName = name.substring(0,spaceLoc)

Question 7

How does one know what pre-defined methods exist and how to use them?

Answer 7

Using a programming textbook or class.

Question 8

What info must you know about a predefined method in order to use it.

Answer 8

1. name of the method
2. The parameters that are required to use it.
3. The method type (what the method will return)

Question 9

Define the term parameters.

Answer 9

Listed after the method name in parentheses. Determines the output. Need to list parameters in the order that it is defined in the method.

Question 10

Define the term method type.

Answer 10

The return type given from a method.

Data type

Question 11

List methods’ return types and number of parameters.

Answer 11

1. length returns an int data type, and has no parameters.
2. indexOf returns int, and has 1 parameter.
3. substring returns a String, and has 2 parameters.

Question 12

List and describe the 2 types of user defined methods.

Answer 12

1. Value returning: must do something with the returned value.
2. Void: does not return a value.

Question 13

List and describe the 2 parts of a method definition.

Answer 13

1. Heading: lists return type, name of the method, the number and data of parameters.
2. Body: gives code to accomplish the task performed by the method.

Question 14

Give an example of a method definition.

Answer 14

modifier(s) returnType methodName (formal parameter list)

{
//code for method. Tasks performed here.
}

Question 15

Define formal parameters.

Answer 15

The variables declared in the heading, within parentheses.

Question 16

Define Actual Parameters.

Answer 16

The variables or expressions used in a call to a method.

Question 17

What modifier is used for the methods we used in class?

Answer 17

We used Static and final.

But here are some more:

private, public, abstract, protected.

Question 18

Be able to code a simple method, similar to what was created in class.

Answer 18

Look at program for this.

Question 19

How many formal parameters can a method have?

Answer 19

0 or more.

Question 20

What statement is used to return a value from a method?

Answer 20

return ____;

The blank could be a calculation, variable name, or literal name.

Question 21

Be able to call a method in from main

Answer 21

Look at programs.

Question 22

Is a literal value or expression allowed to be used as an actual parameter?

Answer 22

Can’t find info on this question.