print Arraylist without loop

Question

I want to print elements in my Arraylist without using a loop of any kind is that possible in java?

import java.util.ArrayList;

class Person
{
    String name;
    String role;

    public Person(String name, String role)
    {
        this.name = name;
        this.role = role;
    }
}

class Main
{
    public static void main(String[] args)
    {
        Person person1 = new Person("george","programmer");
        Person person2 = new Person("barack","programmer");
        Person person3 = new Person("ismail","programmer");

        ArrayList <Person> people = new ArrayList <Person>();
        people.add(person1);
        people.add(person2);
        people.add(person3);

        System.out.println(people.get(0));
        System.out.println(people.get(1));
        System.out.println(people.get(2));
    }
}

Answer 1

No, it is not possible.

Every approach will loop over the values of the array list in certain form. Be it a normal for loop or forEach or the built-in toString() - every approach will loop or iterate over the values of the list in some form.

Answer 2

It depends on how you define "loop". It can be done using a recursive method:

void print( ArrayList<Person> a, int index ) {
   if ( (a != null) && (index < a.size()) ) {
      System.out.println(a.get(index));
      print( a, ++index );
   }
}

then call print( people, 0 );

Answer 3

可能必须获取对象调用tostring方法才能打印数据，否则您将获取对象引用

Answer 4

people.forEach(person -> System.out.println(person));

The above one-liner uses the stream-functionality introduced in Java-8. Conceptually, you're still iterating through the input-elements one by one. But it's more concise than using a for-loop, if that's what you're looking for.

Answer 5

You can print one by one without using loop but the problem is because you are using object type so you cannot print objects unless you use a toString method in the class even if you don't use Arraylist it wont work if you want to print object, unless you use toString method

    class Main
    {
        public static void main(String[] args)
        {  
            ArrayList<Integer> arrayList = new ArrayList<Integer>();
            arrayList.add(6);
            arrayList.add(3);
            arrayList.add(5);

            System.out.println(arrayList.get(0));
            System.out.println(arrayList.get(1));
            System.out.println(arrayList.get(2));
        }
    } 

Answer 6

• It is very simple way to print array without using any loop in JAVA.

  -> For, Single or simple array:

   int[] array = new int[]{1, 2, 3, 4, 5, 6}; System.out.println(Arrays.toString(array));

  The Output:

   [1, 2, 3, 4, 5, 6]

  -> So, this 2D array can't be printed with Arrays.toString()

   int[][] array = new int[][]{{1, 2, 3, 4, 5, 6, 7}, {8, 9, 10, 11, 12,13,14}}; System.out.println(Arrays.deepToString(array));

  The Output:

   [[1, 2, 3, 4, 5, 6, 7], [8, 9, 10, 11, 12, 13, 14]]

☻♥ Done Keep Code