Print ArrayList

Question

I have an ArrayList that contains Address objects   How do I print the values of this ArrayList  meaning I am printing out the contents of the Array  in this case numbers   I can only get it to print out the actual memory address of the array with this code   for int i   0  i  lt  houseAddress size    i             System out print houseAddress get i

User · Answer

since you haven t provide a custom implementation for toString   method it calls the default on which is going to print the address in memory for that object   solution in your Address class override the toString   method like this   public class Address    int addressNo                   protected String toString        return Integer toString addressNo       now when you call   houseAddress get i   in the  System out print    method like this   System out print  houseAddress get i    the toString   of the Address object will be called

User · Answer

assium that you have a numbers list like that  List lt Integer gt  numbers   Arrays asList 1  2  3  4  5  6     if you print the  list    method 1    Conventional way of printing arraylist for  int number   numbers        System out print number        method 2    Lambda Expression to print arraylist numbers forEach  Integer value  - gt  System out print value       method 3    Lambda Expression to print arraylist numbers forEach value - gt  System out print value        method 4    Lambda Expression  method reference  to print arraylist numbers forEach System out  print

User · Answer

I am not sure if I understood the notion of addresses  I am assuming houseAddress here   but if you are looking for way a to print the ArrayList  here you go   System out println houseAddress toString   replaceAll

User · Answer

You can use an Iterator  It is the most simple and least controvercial thing to do over here  Say houseAddress has values of data type String  Iterator lt String gt  iterator   houseAddress iterator    while  iterator hasNext          out println iterator next         Note   You can even use an enhanced for loop for this as mentioned by me in another answer

User · Answer

Since Java 8  you can use forEach   method from Iterable interface   It s a default method  As an argument  it takes an object of class  which implements functional interface Consumer  You can implement Consumer locally in three ways  With annonymous class   houseAddress forEach new Consumer lt String gt           Override     public void accept String s            System out println s                lambda expression   houseAddress forEach s - gt  System out println s      or by using method reference   houseAddress forEach System out  print     This way of printing works for all implementations of Iterable interface  All of them  gives you the way of defining how the elements will be printed  whereas toString   enforces printing list in one format

User · Answer

From what I understand you are trying to print an ArrayList of arrays and one way to display that would be   System out println Arrays deepToString list toArray

User · Answer

public void printList ArrayList lt Address gt  list       for Address elem   list           System out println elem

User · Answer

This helped to me   System out println Arrays toString codeLangArray toArray

User · Answer

This is a simple code of add the value in ArrayList and print the ArrayList Value  public class Samim    public static void main String args             Declare list     List lt String gt  list   new ArrayList lt  gt             Add value in list     list add  First Value ArrayPosition 0        list add  Second Value ArrayPosition 1        list add  Third Value ArrayPosition 2        list add  Fourth Value ArrayPosition 3        list add  Fifth Value ArrayPosition 4        list add  Sixth Value ArrayPosition 5        list add  Seventh Value ArrayPosition 6         String   objects1   list toArray new String 0            Print Position Value     System err println objects1 2            Print All Value     for  String val   objects1            System out println val

User · Answer

public static void main String   args            List lt Moyen gt  list   new ArrayList lt Moyen gt             Moyen m1   new Moyen            m1 setCodification  c1            m1 setCapacityManager  Avinash            Moyen m2   new Moyen            m2 setCodification  c1            m2 setCapacityManager  Avinash            Moyen m3   new Moyen            m3 setCodification  c1            m3 setCapacityManager  Avinash             list add m1           list add m2           list add m3           System out println Arrays toString list toArray

User · Answer

Simplest way to print an ArrayList is by using toString  List lt String gt  a new ArrayList lt  gt         a add  111        a add  112        a add  113        System out println a toString       Output   111  112  113

User · Answer

JSON  An alternative Solution could be converting your list in the JSON format and print the Json-String  The advantage is a well formatted and readable Object-String without a need of implementing the toString    Additionaly it works for any other Object or Collection on the fly    Example using Google s Gson   import com google gson Gson  import com google gson GsonBuilder       public static void printJsonString Object o        GsonBuilder gsonBuilder   new GsonBuilder                  Some options for GsonBuilder like setting dateformat or pretty printing             Gson gson   gsonBuilder create        String json  gson toJson o       System out println json

User · Answer

Add toString   method to your address class then do  System out println Arrays toString houseAddress

User · Answer

if you make the  Override public String toString   as comments  you will have the same results as you did   But if you implement your toString   method  it will work   public class PrintingComplexArrayList    public static void main String   args        List houseAddress   new ArrayList        insertAddress houseAddress       printMe1 houseAddress       printMe2 houseAddress      private static void insertAddress List address        address add new Address 1        address add new Address 2        address add new Address 3        address add new Address 4      private static void printMe1 List address        for  int i 0  i lt address size    i            System out println address get i       private static void printMe2 List address        System out println address          class Address      private int addr      public Address int i                addr   i          Override public String toString         Integer iAddr   new Integer  addr       return iAddr toString

User · Answer

Are you saying that ArrayList is storing addresses of arrays because that is what is returning from the toString call  or because that s actually what you re storing   If you have an ArrayList of arrays  e g   int   arr    1  2  3   houseAddress add arr     Then to print the array values you need to call Arrays deepToString   for  int i   0  i  lt  houseAddress size    i           System out println Arrays deepToString houseAddress get i

User · Answer

Make sure you have a getter in House address class and then use   for int i   0  i  lt  houseAddress size    i             System out print houseAddress get i    getAddress

User · Answer

You can simply give it as   System out println  Address    houseAddress     Your output will look like  address1  address2  address3   This is because the class ArrayList or its superclass would have a toString   function overridden   Hope this helps

User · Answer

Put houseAddress get i  inside the brackets and call  toString   function  i e Please see below  for int i   0  i  lt  houseAddress size    i          System out print  houseAddress get i   toString

User · Answer

list toString   is good enough  The interface List does not define a contract for toString    but the AbstractCollection base class provides a useful implementation that ArrayList inherits

User · Answer

Assuming that houseAddress get i  is an ArrayList you can add toString   after the ArrayList    for int i   0  i  lt  houseAddress size    i             System out print houseAddress get i  toString          A general example   ArrayList lt Double gt  a   new ArrayList    a add 2    a add 32    System out println a toString        output     2 0  32 0

User · Answer

You can even use an enhanced for loop or an iterator like   for  String name   houseAddress        System out println name       You can change it to whatever data type houseAddress is and it avoids unnecessary conversions

User · Answer

you can use print format if you just want to print the element on the console   for int i   0  i  lt  houseAddress size    i             System out printf   s   houseAddress get i

[java] Print ArrayList

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