This is an example of how to create a static array shared between class instances. The example is described in short below:
- We have created a class,
SharedArray, that has astaticint array, initialized with length 10. - In a static block, the array is initialized with random int values, using
random()API method of Math. - The class also has a
printArray()method, that prints the values of the array. - We create a new instance of
SharedArraythat isa1and useprintArray()method to print the values of the static array. - Then we create a new instance of
SharedArray, that isa2and print out the static array values again. - Then we use
printArray()method of a1 object. - The static array in
a1instance has the same values that it had whena2was initialized.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
public class SharedArray {
static int[] array = new int[10];
{
System.out.println();
System.out.println("Running initialization block.");
for (int i = 0; i < array.length; i++) {
array[i] = (int) (100.0 * Math.random());
}
}
void printArray() {
for (int i = 0; i < array.length; i++) {
System.out.print(" " + array[i]);
}
}
public static void main(String[] args) {
SharedArray a1 = new SharedArray();
a1.printArray();
SharedArray a2 = new SharedArray();
a2.printArray();
System.out.println();
a1.printArray();
System.out.println();
}
}
Output:
Running initialization block.
33 33 35 56 75 66 73 68 69 35
Running initialization block.
63 2 0 76 78 34 35 80 91 92
63 2 0 76 78 34 35 80 91 92
This was an example of how to create a static array shared between class instances in Java.
