Collections.min/max, THEN go through list to find secondSmallest

Week 3: Objects, files and exceptions/5b. Second smallest without side effects

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+Write the method
+
+int secondSmallest(ArrayList<Integer> numbers)
+
+...which returns the second smallest element in the list. 
+The method must not change the order of the elements in the list.
+
+Example method call:
+public static void main(String[] parameters){
+    ArrayList<Integer> numbers = new ArrayList<>();
+    numbers.add(5);
+    numbers.add(1);
+    numbers.add(8);
+    numbers.add(3);
+    numbers.add(7);
+
+    System.out.println("List before: " + numbers);
+    System.out.println("Second smallest: " + secondSmallest(numbers));
+    System.out.println("List after: " + numbers);   
+}
+
+Program outputs:
+List before: [5, 1, 8, 3, 7]
+Second smallest: 3
+List after: [5, 1, 8, 3, 7]
+
+
+
+
+
+
+
+
+import java.util.Random;
+import java.util.ArrayList;
+import java.util.Collections;
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        
+        int[][] s = {{3,2,1,4}, {10,20,40,50,30,60}, {9,7,5,3,8,6,4,2}, {25,5,20,15,10}};
+        
+        for (int[] pa : s) {
+            ArrayList<Integer> lista = new ArrayList<>();
+            for (int l : pa) lista.add(l);
+            
+            System.out.println("List before: ");
+            System.out.println("" + lista);
+            System.out.println("Second smallest: " + secondSmallest(lista));
+            System.out.println("List after: ");
+            System.out.println(lista);
+            System.out.println("");
+            
+        }
+    }
+    
+
+    //ADD
+    public static int secondSmallest(ArrayList<Integer> numbers){
+        int smallest = Collections.min(numbers);
+        int secondSmallest = Collections.max(numbers);
+        for (int i : numbers) {
+            if (i > smallest && i < secondSmallest) {
+                secondSmallest = i;
+            }
+        }
+        return secondSmallest;
+    }
+
+
+
+
+
+}
+
+
+
+
+
+List before: 
+[3, 2, 1, 4]
+Second smallest: 2
+List after: 
+[3, 2, 1, 4]
+
+List before: 
+[10, 20, 40, 50, 30, 60]
+Second smallest: 20
+List after: 
+[10, 20, 40, 50, 30, 60]
+
+List before: 
+[9, 7, 5, 3, 8, 6, 4, 2]
+Second smallest: 3
+List after: 
+[9, 7, 5, 3, 8, 6, 4, 2]
+
+List before: 
+[25, 5, 20, 15, 10]
+Second smallest: 10
+List after: 
+[25, 5, 20, 15, 10]
+
+