Creating Record Objects and Calling Methods

Overview

In this lesson, students will learn how to create objects of a record type and call methods on these records.

Learning Objectives

• 1.1.D.1 Identify methods that are provided for a record.
• 1.1.D.2 Write and interpret calls to methods of a record.

Skills

• S1.D Explain the impact design has on data storage.
• S2.A Write program code and implement algorithms.
• S2.C Analyze an algorithm and program code for correctness.

Student Outcomes

Students will be able to:

• define a new record type;
• create a new object of the new record type;
• call methods on the new object.

Duration: 1 class period

Resources

• Learn: Creating Objects of a Record and Calling Methods
• Practice: Creating Records and Calling Methods Practice

Warm-up / Motivate

As students enter the room, provide them with an index card that contains descriptions for records. Have the students write the record.

Some example descriptions might be:

1. Record to represent a City that contains the State/Province and Country.
2. Record to represent a Student that contains their student id number, first name, and last name.
3. Record to represent a Hurricane that contains the name of the hurricane, date it made landfall, and size (scale of 1 - 5).

If students need assistance, they can refer back to Learn: Introduction to Records

Learn

Either as a group or on their own, have students complete tutorial: Learn: Creating Objects of a Record and Calling Methods

Practice

• Have students complete practice exercises: Practice: Creating Records and Calling Methods Practice
• Either have students record their practice to collect and provide feedback or review the practice as a whole group.

Wrap-up / Extension

Have students revisit the Records they created when they entered the classroom. Have them complete the following:

1. Identify the instance variables, constructor, and methods.
2. Create an object of the record type.
3. Write a call to one of the methods.