Initial Commit

CS5 - Demo/Main.java

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+import java.util.Random;
+
+/*
+    CS5 Demo
+
+    For Loops and Random Numbers    
+    This demo goes over how to write for loops and how
+    there generally used. This demo also includes Java's
+    Random class, so we can generate random values while using for
+    loops. 
+*/
+public class Main {
+    public static void main(String[] args) {
+        //This for loop prints numbers from 0 through 9 (inclusive)
+        //A for loop in this instance does what is known as "iterating"
+        //over a series of values, in this case, we are iterating over
+        //a range of numbers. In order to use a for loop in this way
+        //we need to define three pieces inside the parenthesis
+        //int i = 0; This first piece (initialization) defines 
+        //what value you are using to iterate your loop. This can 
+        //actually be left out (unlike the next two pieces) if you're
+        //using a variable already defined elsewhere in your code
+        //i < 10; This is your condition, what determines if the loop
+        //should continue to run. So long as the variable i is < 10, 
+        //the loop runs. 
+        //i++ - This is our modifier, the thing that is changing to
+        //ensure that at some point our loop will exit (and avoid an 
+        //infinite loop). i++ just means to add 1 to i. Each time the 
+        //loop finishes a run of whatever is inside the brackets, i++
+        //will get called to update the value of i to i = i + 1;
+        //For this loop, all we're doing is printing the value of
+        //i as it changes while the loop runs. 
+        for(int i = 0; i < 10; i++) {
+            System.out.println("Index Number: " + i);
+        }
+
+        //Similar to Scanner, we can create other types of objects
+        //and in this case, we are creating one called Random. 
+        //This just gives us access to a (pseudo) random value generator.
+        //This wouldn't be good if you wanted truely random values, but
+        //it'll serve out purposes well enough for now. 
+        Random random = new Random();
+
+        //With this for loop, we're trying to print 5 of each type of 
+        //primitive value (int, double, and boolean) that we've seen so 
+        //far. If all goes well, this will print the following for each
+        //variable type
+        //ValueName Value i+1: randomValue
+        //Where ValueName is the current random value type we're trying to create
+        //i is the current for loop i value
+        //randomValue is the value generated by the Random object for
+        //that specific type of variable. 
+        for(int i = 0; i < 5; i++) {
+            System.out.println("Int Value " + (i + 1) + ": " + random.nextInt());
+            System.out.println("Double Value " + (i + 1) + ": " + random.nextDouble());
+            System.out.println("Boolean Value " + (i + 1) + ": " + random.nextBoolean());
+        }
+    }
+}