Logic & Computation Classes Lecture 1
import java.lang.System;
public class classes {
public static void main(String[] args) {
//Create a new dog with a name, breed, age, and color
Dog pepito = new Dog("Pepito", "Papillon", 5, "White");
//And you can call the methods of the class to get information
//relevant to the dog!
pepito.getStats();
Cat ratCatcher = new Cat("Rat Catcher", "Tabby", 5, "Gray");
ratCatcher.meow();
}
public static class Dog {
//Instanced variables when the class is made
String name;
String breed;
int age;
String color;
// Constructor Declaration of Class
//This method 'constructs' the class whenever it is instantiated (made)
//by allocating parameters to the instanced variables in the class
public Dog(String name, String breed, int age,
String color)
{
this.name = name;
this.breed = breed;
this.age = age;
this.color = color;
}
//To explain the example further, whenever you make a new 'dog',
//the method will allocate the necessary input into the 'dog'
//Dog pepito = new Dog("Pepito", "Papillon", 5, "White");
// method 1, returns the name of the dog
public String getName() { return name; }
// method 2, returns the breed of the dog
public String getBreed() { return breed; }
// method 3, returns the age of the dog
public int getAge() { return age; }
// method 4, returns the color of the dog
public String getColor() { return color; }
public void getStats()
{
System.out.println("Hi my name is " + this.getName()
+ ".\nMy breed, age and color are "
+ this.getBreed() + ", " + this.getAge()
+ ", " + this.getColor());
}
//Self explanatory.
public void bark()
{
System.out.println("Bark bark!");
}
}
public static class Cat {
//Initiated variables
String name;
String breed;
int age;
String color;
//Constructor method, SUPER IMPORTANT DONT FORGET
public Cat(String name, String breed, int age,
String color)
{
this.name = name;
this.breed = breed;
this.age = age;
this.color = color;
}
// Seems oddly familiar to the dog class, I wonder how we can optimize this...
public String getName() { return name; }
public String getBreed() { return breed; }
public int getAge() { return age; }
public String getColor() { return color; }
public void getStats()
{
System.out.println("Hi my name is " + this.getName()
+ ".\nMy breed, age and color are "
+ this.getBreed() + ", " + this.getAge()
+ ", " + this.getColor());
}
//Cat goes meow!
public void meow()
{
System.out.println("Meow!");
}
}
//Your lab will be to finish the functionality of the Student class. Have fun tomorrow!
public static class Student
{
//We're stepping up our variables now
//'Private' means that only the instance of the class can access these variables directly
//No external source or command can access these variables.
//We do this to prevent malicious attackers from accessing our data.
//We are creating a class to maintain information over students, so our data
//must be private, lest we gather the wrath of the government and angry parents
private String firstName;
private String lastName;
private int testScore1, testScore2, testScore3, testScore4;
private int id;
//Initialize our data!
public Student(String fn, String ln, int t1, int t2, int t3, int t4, int id)
{
this.firstName = fn;
this.lastName = ln;
this.testScore1 = t1;
this.testScore2 = t2;
this.testScore3 = t3;
this.testScore4 = t4;
this.id = id;
}
}
}
