Alten codility test - Integer iterator for valid and invalid numbers …

src/main/java/com/antesh/alten/codility/SolutionIter.java

@@ -0,0 +1,68 @@
+package com.antesh.alten.codility;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+/*
+    Task is to read a file line by line which contains valid, invalid number and text and iterate the line and print the same number
+    if it is valid else print 0. Valid example: 10, +15, 2, -28 and invalid numbers for example, ++12, 10e2, #1254, ----1547
+    Complete the iterator() method logic to process
+
+    Given code snippet was:
+
+    public class SolutionIter implements Iterable<Integer> {
+
+        public SolutionIter(Reader inp);      // complete the remaining logic as per problem statement
+
+        public Iterator<Integer> iterator();  // complete the remaining logic as per problem statement
+    }
+
+    // sample
+    for (Integer x : new SolutionIter(reader)) {
+        System.out.println(x);
+    }
+ */
+
+public class SolutionIter implements Iterable<Integer> {
+    public BufferedReader reader;
+
+    public SolutionIter(BufferedReader inp) {
+        this.reader = inp;
+    }
+
+    public static void main(String[] args) throws IOException {
+        FileReader fileReader = new FileReader("C:\\test-input.txt");
+        BufferedReader reader = new BufferedReader(fileReader);
+
+        for (Integer x : new SolutionIter(reader)) {
+            System.out.println(x);
+        }
+
+        reader.close();
+        fileReader.close();
+    }
+
+    public Iterator<Integer> iterator() {
+        List<Integer> numbers = new ArrayList<>();
+        populateNumbersFromInputFile(numbers);
+        return numbers.iterator();
+    }
+
+    private void populateNumbersFromInputFile(List<Integer> numbers) {
+        try {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                try {
+                    numbers.add(Integer.parseInt(line));
+                } catch (Exception e) {
+                    numbers.add(0);
+                }
+            }
+        } catch (Exception e) {
+            numbers.add(0);
+        }
+    }
+}