Create 17a List length and iterating

Week 2: Methods, strings and lists/17a List length and iterating

@@ -0,0 +1,119 @@
+size
+
+
+ArrayList<Integer> numbers = new ArrayList<>();
+numbers.add(10);
+numbers.add(5);
+System.out.println(numbers.size()); //2
+
+
+for(int i=0; i<5; i++) {
+    numbers.add(i);
+}
+System.out.println(numbers); //[10, 5, 0, 1, 2, 3, 4]
+
+
+int len = numbers.size();
+System.out.println(len); //7
+ 
+
+
+Program outputs:
+2
+[10, 5, 0, 1, 2, 3, 4]
+7
+
+
+
+
+==================================
+
+i<numbers.size()
+
+
+
+ArrayList<Integer> numbers = new ArrayList<>();
+numbers.add(10);
+numbers.add(5);
+numbers.add(6);
+numbers.add(22);
+numbers.add(-4);
+System.out.println(numbers); //[10, 5, 6, 22, -4]
+
+
+for (int i=0; i<numbers.size(); i++) {
+    numbers.set(i, numbers.get(i) + 1);
+}
+System.out.println(numbers); //[11, 6, 7, 23, -3]
+ 
+
+Program outputs:
+[10, 5, 6, 22, -4]
+[11, 6, 7, 23, -3]
+
+
+
+
+
+
+
+==================================
+
+for loop - iterate through each element
+
+
+
+ArrayList<Integer> numbers = new ArrayList<>();
+numbers.add(10);
+numbers.add(5);
+numbers.add(6);
+numbers.add(22);
+numbers.add(-4);
+
+for (int number : numbers) {
+    System.out.println(number);
+}
+ 
+
+Program outputs:
+
+10
+5
+6
+22
+-4
+
+
+
+
+==================================
+
+SUM length of ALL words
+
+
+
+
+ArrayList<String> words = new ArrayList<>();
+words.add("Lake");
+words.add("Swamp");
+words.add("Hoe");
+words.add("Shovel");
+
+
+int length = 0;
+for (String word : words ) {
+    length = length + word.length();
+}
+
+System.out.println("Combined length: " + length );
+ 
+
+Program outputs:
+Combined length: 19
+
+
+
+
+
+
+