Static inner class example

This is an example of how to use a static inner class. We have set the example as described below:

  • We have created a class, ArAlgo that contains a static inner class P.
  • Class P has two double attributes and their getters.
  • ArAlgo class also has a static method, P min_max(double[] vals). The method gets a double array and for each value in the array and computes the minimum
    and the maximum value in the array.
  • We create a new double array and fill it with random values, using random() API method of Math. Then we get a new instance of P class, using min_max(double[] vals) method of ArAlgo class, with the double array created above. We use the getters of the ArAlgo class to get the values of the two fields.

Let’s take a look at the code snippet that follows:  

package com.javacodegeeks.snippets.core;

public class StaticInnerClass {

    public static void main(String[] args) {

  double[] num = new double[20];

  for (int i = 0; i < num.length; i++) {

num[i] = 100 * Math.random();


  ArAlgo.P p = ArAlgo.min_max(num);

  System.out.println("min = " + p.getF());

  System.out.println("max = " + p.getS());

class ArAlgo {

     * A pair of floating-point numbers
    public static class P {


   * Constructs a pair from two floating-point numbers



  private double f;


  private double s;

  public P(double a, double b) {

f = a;

s = b;



   * Returns the first number of the pair


  public double getF() {

return f;



   * Returns the second number of the pair


  public double getS() {

return s;


     * Computes both the minimum and the maximum of an array
    public static P min_max(double[] vals) {


  double min = Double.MAX_VALUE;

  double max = Double.MIN_VALUE;


  for (double v : vals) {

if (min > v) {

    min = v;


if (max < v) {

    max = v;



  return new P(min, max);


min = 1.5117631236976625
max = 90.86550459529965

This was an example of static inner class in Java.

Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.
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