JD1's Personal Development Blog

When working with arrays, there's an easier way to loop through the indices than manually doing so. We can use the enhanced for statement for this.

class Class1{
   public static void main(String args[]){
	   int aryOne[] = {3,4,5,6,7};
	   int total = 0;
	   for (int x: aryOne){
		   total += x;
	   }
	   System.out.println(total);
   }
}

First of all, we create our array (aryOne) and use ...

We're going to build a program to re-enact a dice being rolled one thousand times. We're going to output how many times each face of the dice is rolled.

import java.util.Random;
 
class RollDice{
   public static void main(String args[]){
	   Random rand = new Random();
	   int freq[] = new int[7];
 
	   for(int roll = 1; roll <= 1000; roll++){
		   ++freq[1 + rand.nextInt(6)];
	   }
	   System.out.println("Face\tFrequency");

...

Say we have an array with ten indices. Below is how we can calculate the sum of these indices.

class Class1{
	public static void main(String args[]){
		int[] array1 = {1,2,3,4,5,6,7,8,9,10};
		int total = 0;
 
		for(int counter = 0; counter < array1.length; counter++){
			total += array1[counter];
		}
 
		System.out.println("Total\t" + total);
 
	}
}

Firstly, initialise ...

Arrays are used to store many values under the one variable, so to speak. You can initialise an array the long and drawn out way by manually assigning each index a value or you can implement an array initialiser to do the job for you.

class Class1{
	public static void main(String args[]){
		int array1[] = new int[10];
		array1[0] = 87;
		array1[1] = 543;
		array1[2] = 65;
		System.out.println(array1[2]);
 
		int array2[]

...

Random numbers can be used in Java. Here's a small random number generator and how it works.

import java.util.Random;
class Class1{
	public static void main(String args[]){
		Random dice = new Random();
		int number;
 
		for(int counter = 1; counter <= 10; counter++){
			number = dice.nextInt(6) + 1;
			System.out.println(number);
		}
	}
}

First of all, we need to import the random class. ...