Print per 2 char in java arraylist (non static arraylist)-CodePudding

Im new with java. im getting struggle with printin something, this is my arraylist

arraylist = ['a','u','o','e']

If my arraylist isnt a static length arraylist. How could I print that list into this

"Your Value: au, oe"

Im kinda confused

Thanks for advance

CodePudding user response：

you can simply loop the array and print each character, and when (index 1) % 2 == 0 && i != list.size() -1, which means it is the 2rd,4th,6th,... element and not the last one, print an extra ,.

  public void printArray() {
        List<Character> list = new ArrayList<>(Arrays.asList('a', 'u', 'o', 'e'));
        System.out.print("Your Value: ");
        for (int i = 0; i < list.size(); i  ) {
            System.out.print(list.get(i));
            if ((i   1) % 2 == 0 && i != list.size() - 1) {
                System.out.print(",");
            }
        }
    }

CodePudding user response：

So an array is a datatype that we use to store multiple values in a single variable. Arrays start at index 0 rather than 1. So this means the first element in the array has an index of 0

array = {0, 1, 2, 3, 4}

So, for your example we would want to do this:

System.out.println("Your Value: "   arrayList.get(0)   arrayList.get(1)   ","   arrayList.get(2)   arrayList.get(3)

Where we say arrayList.get(0) that is accessing the first letter in the array which is 'a'

CodePudding user response：

You can concatenate String with character " " like this.

System.out.println("Your Value: "   arraylist.get(0)   arraylist.get(1)   ", "   arraylist.get(2)   arraylist.get(3));

or you can use a smarter way, using static method inside String class called "format" like this:

System.out.println(String.format("Your Value: %s%s, %s%s", arraylist.get(0), arraylist.get(1), arraylist.get(2), arraylist.get(3)));

You can learn more about String.format() reading this post:

https://www.javatpoint.com/java-string-format