Team Methods and Control Structures Lesson

Control Structures

if, else if, and else

A single if statement only takes one condition, but what if we wanted to specify more conditions? We can add else if and else statements to accomplish this.

Structure:

if(condition) {
    // code to execute when condition is met
} else if (condition 2) {
    // code to execute when condition is false but condition 2 is true
} else {
    // code to execute when condition and condition 2 are false
}

switch statements

switch statements check the value of a condition and run code blocks for different scenarios.

Structure:

switch(condition) {
    case value1:
        // code
        break;
    case value2:
        // code
        break;
    default;
        // code that should run for unspecified case
        break;
}

switch statements are especially useful for creating menus.

Methods

Method: A piece of code that runs only when it's called. It can perform specific actions on an object.

// example
myPainter.turnRight();

In this example, the method turnRight is called on the object myPainter. It will perform a set of actions that will allow the painter to turn right. This makes our code more readable and reusable.

public class Person {

    // defining the method sleep, which can be called on future instances of Person
    public static void sleep () {
        // will print out zzzzzzzz when sleep is called on Person
        System.out.println("zzzzzzzz");
    }

    public static void main(String[] args) {
        Person myPerson = new Person();
        myPerson.sleep();
    } 
}

Person.main(null);

zzzzzzzz

Hacks

Make a class with the following

• Complete the Person class with the following methods
  • A weather method telling the person to put on a jacket if it's raining outside
  • Modify the sleep method to made the person sleep at certain hours