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Java Arrays

Arrays are used to store multiple values in a single variable

Declare an array

• (define the variable type)(square barckets) (variable name);

String[] cars;

Insert value to it

String[] cars = {“Volvo”, “BMW”};

• can use an array literal (place the values in a comma separated list, inside curly braces)

Access the Elements of an Array

• access an array element by referring to the index number

• array indexes start with 0

cars[0]; ==> Volvo

Change an Array Element

• To Change the value of a specific element, refer to the index number

cars[0] = “Opel”;

Array length

• find out how many elements an array has, use the length property

cars.length ==> 2

Loop Through an Array

Use for loop, use .length, can loop through the array elements

Loop Through an Array with For-Each

exclusively to loop through elements in array

for(type variable : arrayName) {
  code block
}

Multidimentional Arrays

Is an array of arrays

int[][] myNumbers = {1, 2, {3,4}, {5,6,7}};
      //each array within its own set of curly braces
int x = myNumbers[1][2]; ==> 7
      //access the third element in the second array of myNumbers

Can also use a for loop inside another for loop to get the elements of a two-dimentional array

for(int i = 0; i < myNumbers.length; ++i){
  for(int j = 0; j < myNumbers[i].length; ++j){
    System.out.println(myNumbers[i][j];
  }
}