someMethod(ArrayList<Integer> list)

Week 3: Objects, files and exceptions/3a. Objects as parameters and return values

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+Objects as parameters -> passed as a REFERENCE
+
+
+so
+a method can change/MODIFY INPLACE the input list it receives as a parameter
+
+
+import java.util.ArrayList;
+
+public class Example {
+    public static void main(String[] parameters){
+        ArrayList<Integer> numbers = new ArrayList<>();
+        for (int i=1; i<5; i++) {
+            numbers.add(i);
+        }
+        System.out.println(numbers);
+        increase(numbers);
+        System.out.println(numbers);
+    }
+
+    public static void increase(ArrayList<Integer> list) {
+        for (int i=0; i<list.size(); i++) {
+            list.set(i, list.get(i) + 1);
+        }
+    }
+}
+
+Program outputs:
+[1, 2, 3, 4]
+[2, 3, 4, 5]
+
+
+