First, a quick review:
In Java, you will frequently see statements written like so:
Given that number is an integer...
This tends to confuse many beginning programmers, because they are missing the fundamental purpose of the equal sign.
Like I've said before, the equal sign does not just state equality; instead, it is used to ASSIGN a value.
In other words, it doesn't just state that the operand on the left and the value on the right are equal. Instead, it says that the operand is now equal to the value - that the operand takes the value on the right side of the equal sign.
Interpreting the example above, you should think to yourself, 'number is now equal to number + 5.'
This will save you a lot of headache.
If you understand this, here is a list of equivalent expressions that will save you some time in programming:
Predictability makes for boring games. If you want games to challenge players, you will want to use randomization.
Let's use TUMBL as an example. For those of you who are not familiar with the game, click here.
1. Each row is generated randomly, meaning that the player will not be able to figure out a pattern that lets them stay alive longer.
2. Stars are generated randomly on the left or right side of the screen.
3. Power-ups appear randomly.
And so on.
So how do you integrate randomization to a game?
It's quite simple. Take a look at this example class:
Let's break up this statement:
The second part of the statement:
In other words...
you are basically telling the computer:
"I want to create a Random object called rand. Use the Random class to create this new object."
If you are confused, that's okay. We will go into object creation and constructors in a lot more detail in the coming lessons.
Just know that:
Mini Lesson : Imports
When you copy and paste the following class into Eclipse:
Figure 1: randomization class
class Randomization {
public static void main(String[] args{
Random rand = new Random();
}
}
Earlier, I mentioned that the src folder contains all your Java code and that the JRE System Library contains importable code
that you can incorporate into your own projects.
Think of this Library as one containing "books" (Java classes). When you write an essay and you reference a book, you cite it.
Same with Java. When you use a "book" (Java classes) from the Library, you must state that you are using this "book."
This is accomplished by importing.
How do we import? It's pretty simple.
1. The easiest way is to press:
2. Another way is to put your mouse over the words that show an error (in this case Random) and click on the quick fix that suggests importing
the Random class from Java.util.
The full class, after importing, will look like this.
Figure 2: randomization class with imports
The easiest method we will learn is:
When you call this from a random object such as rand like so:
Using this, you can simulate chance and probability.
How? We will go over probability and if statements tomorrow!
If you have any questions, contact me!
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