java

Working With Arrays in Java

Arrays refer to a sequential collection of elements of the same type. It is used to store a collection of data. Unlike Javascript where an array can hold many elements of different data types, an array in Java holds a fixed number of values of a single type.

Immediately after creating an array, its length is fixed. Each item in an array is referred to as an element, and each element can be accessed by its numerical index.

An array index begins from 0 and begins to increment for the given length of the array.

An array illustration from Oracle

Syntax

dataType [] arrayRefValue; //Preferred way

dataTaype arrayRefValue []; //Not so preferred way

Processing Arrays

public class TestArray {
public static void main(String [] args) {
double [] myList = {1.2, 1.4, 2.5, 4.5, 1.6}
System.out.println(myList[0]) // 1.2
System.out.println(myList[1]) // 1.4
System.out.println(myList[2]) // 2.5
System.out.println(myList[3]) // 4.5
System.out.println(myList[4]) // 1.6
}
}

Summing All Elements in an Array

public class TestArray {
public static void main(String [] args) {
double [] myList = {1.2, 1.4, 2.5, 4.5, 1.6}
double total = 0;
for(int i=0; i<myList.length; i++){
total +=myList[i];
}
System.out.println("Total is "+total); //11.2
}
}

Finding The Largest Element in an Array

public class TestArray {
public static void main(String [] args) {
double [] myList = {1.2, 1.4, 2.5, 4.5, 1.6}
double max = myList[0];
for(int i=0; i<myList.length; i++){
if(myList[i] > max) max = myList[i];
}
System.out.println("Largest value is "+max); //4.5
}
}

See the official Java documentation for Arrays

THE END.

Recent Posts

How to Dynamically Create, Update, and Delete HTML Elements

In modern web development, dynamically manipulating HTML elements is essential for creating interactive and responsive…

4 days ago

Why parseInt(’09’) Returns 0

If you've ever encountered the puzzling behavior of parseInt('09') returning 0 in JavaScript, you're not…

1 week ago

Event Bubbling and Capturing: Why Your Click Listener Fires Twice (And How to Fix It)

If you’ve ever built an interactive web application, you may have encountered a puzzling issue:…

2 weeks ago

Practical Array Methods for Everyday Coding

Arrays are the backbone of programming, used in nearly every application. Whether you're manipulating data,…

2 weeks ago

What the Heck Is the Event Loop? (Explained With Pizza Shop Analogies)

If you've ever tried to learn JavaScript, you’ve probably heard about the "Event Loop"—that mysterious,…

3 weeks ago

Why [] === [] Returns false in JavaScript (And How to Properly Compare Arrays & Objects)

JavaScript can sometimes behave in unexpected ways, especially when comparing arrays and objects. If you've…

3 weeks ago