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  1. Summing The Elements of An Array

    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 ...
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  2. Arrays

    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[]
    ...
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  3. Random Number Generator

    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. ...
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  4. Math Class Methods

    There are many built in methods we can use to conduct mathematical operations to numbers. Here are some of them.

    class Class1{
    	public static void main(String args[]){
    		//How far number is from zero.
    		System.out.println(Math.abs(-26.7));
    		//Rounds number up.
    		System.out.println(Math.ceil(7.4));
    		//Rounds number down.
    		System.out.println(Math.floor(7.8));
    		//Greater of the two numbers.
    		System.out.println(Math.max(8.6,
    ...
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  5. Do While Loop

    We use the Do While Loop when we want to run a set of instructions before testing to see if a condition is true. The difference between a Do While Loop and a While Loop is that the While Loop tests the condition first and then runs the instructions.

    class Class1{
    	public static void main(String args[]){
    		int counter = 0;
    		do{
    			System.out.println(counter);
    			counter++;
    		}while(counter <= 10);
    	}
    }
    ...
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