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int intArray[]; //declaring array
intArray = new int[20]; // allocating memory to array
//OR
int[] intArray = new int[20]; // combining both statements in one
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int[] array1 = new int[5]; //int array length 5
String[] array2 = new String[5] //String array length 5
double[] array3 = new double[5] // Double array length 5
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An array is an ordered collection of elements of the same type, identified by a pair of square brackets [].
To use an array, you need to:
1. Declare the array with a name and a type. Use a plural name for array, e.g., marks, rows, numbers. All elements of the array belong to the same type.
2. Allocate the array using new operator, or through initialization, e.g.
int[] marks; // Declare an int array named marks
// marks contains a special value called null.
int marks[]; // Same as above, but the above syntax recommended
marks = new int[5]; // Allocate 5 elements via the "new" operator
// Declare and allocate a 20-element array in one statement via "new" operator
int[] factors = new int[20];
// Declare, allocate a 6-element array thru initialization
int[] numbers = {11, 22, 33, 44, 55, 66}; // size of array deduced from the number of items
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int[] intArray = new int[20];
String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
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String[] myStringArray = new String[3];
String[] myStringArray = {"a", "b", "c"};
String[] myStringArray = new String[]{"a", "b", "c"};
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// How to use arrays
// Julian
public static void main(String[] args)
{
// Initialize array
int[] arrNum = {25, 23, 15, 20, 24};
// Recorrerlo
for(int a = 0; a < arrNum.length; a++)
{
System.out.println(arrNum[a]);
}
}
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String[] array = new String[] { "String1", "String2", "String3" }; // Create array
String string3 = array[2]; // Get array