Need explanations on how this code processes Arraylist values

Question

public static void mystery1(ArrayList list) { 
for (int i = list.size() - 1; i > 0; i--) { 
    if (list.get(i) < list.get(i - 1)) { 
        int el         


        

Answer 1

Here is what happens, step by step:

• Initial state of your list: [30, 20, 10, 60, 50, 40]
• Is 40<50? Yes. So remove 40, and put it as the first element of the list: [40, 30, 20, 10, 60, 50]
• Is 60<10? No. don't touch anything: [40, 30, 20, 10, 60, 50]
• Is 10<20? Yes. So remove 10, and put it as the first element of the list: [10, 40, 30, 20, 60, 50]
• Is 30<40? Yes. So remove 30, and put it as the first element of the list: [30, 10, 40, 20, 60, 50]
• Is 10<30? Yes. So remove 10, and put it as the first element of the list: [10, 30, 40, 20, 60, 50].

The result is then: [10, 30, 40, 20, 60, 50]