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Methods, Data and Data Types

Methods, Data and Data Types. Chapter 1-3. Wombat and leafs. Open up greenfoot WombatWorld scenario Lets reverse engineer Wombat class Lets look at methods and data of this class? How and where?. Java language syntax. Comments: You can add comments to your program to explain the code

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Methods, Data and Data Types

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  1. Methods, Data and Data Types Chapter 1-3

  2. Wombat and leafs • Open up greenfootWombatWorld scenario • Lets reverse engineer Wombat class • Lets look at methods and data of this class? How and where?

  3. Java language syntax • Comments: You can add comments to your program to explain the code // single line comment /* multiple line comment */ • Constructor is a special method that has the same name as the class; it has no return value

  4. Data Types • Whole numbers: represented by : int • Example: intnumStudents; • Real numbers, numbers with fractional components, floating point numbers:float, double • Example: floatbodyTemp; doublesizeOfAtom; doubledistanceToMars; • Logic variable that holds true or false values: boolean • Example: boolean raining; // true or false

  5. Wombat Class

  6. Leaf Class

  7. Interacting with the Objects • We use the methods: • The Class (super class) Actor provides the methods: void move() void turnLeft() booleancanMove() intgetLeavesEaten() Void setDirection(int direction)

  8. Editing the source code • Right click on Class, click on Edit code • Add code to the methods • We will add to the constructor Rocket() gunReloadTime = 5;

  9. The Crab Scenario • Lets work on the Crab Scenario to learn more about object-oriented deisgn

  10. 10 concepts • Method • Method definition (in the code) • Method call • Parameters • Sequence of instructions • Assignment statement (assigning a value to a data) • ; terminator • Inheritance (OOP concept: Ex: Actor::Crab) • Void return type • If-statement (selection statement; expressing choices in execution)

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