Java Beginner Tutorial #5 : Array

Arrays

are variables that can store many values.

Keep in mind that Arrays are Indexed starting at 0.

public class ExampleClass {
  public static void main(String[] args) {
   
    String[] pets = {"dog","cat","fish","bird"};
    System.out.println(pets[0]);
  }
}

Output

dog

Array length

Get the length of an Array by using length

For the code below, the output is 3.

public class Example{
    public static void main(String[] args) {
    String [] pets = {"dog","cat","fish"};
    System.out.println(pets.length);
     }
}

Array Loop

for loop can be used to output all elements within an array.

public class Main{
  public static void main(String[] args) {
    String[] pets = {"dog", "cat", "fish", "bird"};
    for (int i = 0; i < pets.length; i++) {
      System.out.println(pets[i]);
    }
  }
}

Output :

Multidimensional Arrays

are arrays that hold many other arrays.

Each array is separated by curly brackets {}

public class Example {
  public static void main(String[] args) {
   
 int[][] Salaries = { {22000, 25000, 38000, 42000}, {87000, 69000, 71000} };
    
for (int partTime = 0; PartTime < Salaries.length; ++ PartTime) 
{

for(int fullTime = 0; fullTime < Salaries[partTime].length; ++ fullTime) {
        System.out.println(Salaries[partTime][fullTime]);
      }
    }
  }
}

Output