7.2 Processing Array Elements
Individual array elements are processed like variable.
Example
/**
* This program displays even values
* of array.
*/
public class EvenArray
{
public static void main(String[] args)
{
int[] list = { 2, 5, 16, 18, 21 };
// Display all even elements of array
System.out.println("The even numbers of array:");
for (int i = 0; i < list.length; i++)
{
if (list[i] % 2 == 0)
{
System.out.print(list[i] + " ");
}
}
System.out.println();
}
}
Output :
The even numbers of array:
2 16 18
2 16 18
Copying arrays
When you copy an array variable, remember that you are copying a reference to the array. For example:
double[] a = new double [3];
double[] b = a;
This code creates one array of three doubles, and sets two different variables to refer to it. This situation is a form of aliasing.
If want to allocate a new array and copy elements from one to the other.
If want to allocate a new array and copy elements from one to the other.
double[] list1 = {3.9, 6.7, 13.3};
double[] list2 = new double [list1.length];
for (int i = 0; i < list1.length; i++)
{
list2[i] = list1[i];
}
Finding largest value in array
/**
* This program find the largest value
* in an array
*/
public class PassArray
{
public static void main(String[] args)
{
final int SIZE = 10; // Size of the array
// Create an array.
int[] list = new int[SIZE];
// Fill array with random values
for (int i = 0; i < list.length; i++)
{
list[i] = (int) (Math.random() * 100);
}
int max = 0; // hold index number of largest number
// Finding largest value.
for (int i = 0; i < list.length; i++)
{
if (list[i] > list[max])
{
max = i;
}
}
// Show all elements of array
System.out.print("Elements are : ");
for (int i = 0; i < list.length; i++)
{
System.out.print(list[i] + " ");
}
System.out.println();
// Show largest value of array
System.out.println("Largest value is " + list[max]);
}
}
Output :
Elements are : 27 8 70 5 47 36 86 89 4 40
Largest value is 89
Largest value is 89
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