print arraylist element

Question

how do i print the element  e  in arraylist  list  out    ArrayList lt Dog gt  list   new ArrayList lt Dog gt      Dog e   new Dog     list add e    System out println list

User · Answer

Printing a specific element is   list get INDEX    I think the best way to print the whole list in one go and this will also avoid putting a loop  Arrays toString list toArray

User · Answer

You should override toString   method in your Dog class  which will be called when you use this object in sysout

User · Answer

First make sure that Dog class implements the method public String toString   then use  System out println list get index     where index is the position inside the list  Of course since you provide your implementation you can decide how dog prints itself

User · Answer

Do you want to print the entire list or you want to iterate through each element of the list  Either way to print anything meaningful your Dog class need to override the toString   method  as mentioned in other answers  from the Object class to return a valid result    public class Print       public static void main final String   args            List lt Dog gt  list   new ArrayList lt Dog gt             Dog e   new Dog  Tommy            list add e           list add new Dog  tiger             System out println list           for Dog d list                System out println d                  prints  Tommy  tiger                       private static class Dog           private final String name          public Dog final String name                this name   name                      Override         public String toString                 return name                      The output of this code is    Tommy  tiger    Tommy   tiger

User · Answer

Here is an updated solution for Java8  using lambdas and streams   System out println list stream                           map Object  toString                          collect Collectors joining   n        Or  without joining the list into one large string   list stream   forEach System out  println

User · Answer

If you want to print an arraylist with integer numbers  as an example you can use below code   class Test      public static void main String   args           ArrayList lt Integer gt  arraylist   new ArrayList lt Integer gt              for int i 0  i lt  10  i                 arraylist  add i                    for  Integer n   arraylist                System out println n                     The output is above code   0 1 2 3 4 5 6 7 8 9 10

User · Answer

Your code requires that the Dog class has overridden the toString   method so that it knows how to print itself out  Otherwise  your code looks correct

[java] print arraylist element?

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