Adding elements from one array to another Java

Question

Just coming back to Java after a few years break. I am trying to select elements from one array and store them in another in Java. I have created a new array of the same type with a fixed number of elements. The array that I am copying from is not null I have printed it out. But when I try to display the new array the values are not there - just a reference to the element. There probably something that I have overlooked. I have been searching for the last day but am not getting anywhere. I would really appreciate some help. Code below:

PersonDetails user = new PersonDetails(userName,userGender,userAge,userInterests);
PersonDetails [] userArray =  new PersonDetails [numberOfDaters];   
PersonDetails [] dateArray =  new PersonDetails [numberOfDaters];   
userArray = user.getArray("datingdata.txt", numberOfDaters);
dateArray = Arrays.copyOf(userArray, userArray.length);

char [][] interestArray = new char[numberOfDaters][5];  
for (int z =0;z<userArray.length; z++) {                
   interestArray[z] =
      userArray[z].getAllInterests( userArray[z].getInterests());                   
}
String remove = user.getOnes(interestArray);
System.out.print(remove);
StringTokenizer st = new StringTokenizer(remove); 
int num = st.countTokens();
PersonDetails [] userRemoveArray =  new PersonDetails [num]; 
while(st.hasMoreTokens()) {
   int token = Integer.parseInt(st.nextToken()); 
   for(int x =0;x<userRemoveArray.length;x++) {
      userRemoveArray[x] = userArray[token];
   }
   System.out.println(userRemoveArray);  
} 

The output is as follows:

[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488
[LPersonDetails;@a8c488

Thanks in advance

Answer 1

You can use the .addAll(...) method or one of the many methods found here .

As for printing out the elements of the array... you will have to implement your own .toString() method to avoid displaying the object reference.

Answer 2

Here is a small example to make it more easier for you since you had noted that you are just coming back to Java after sometime and i hope this helps you out :)

public class PersonDetails {

private String userName;

private String gender;

@Override
public String toString() {
    return "PersonDetails [userName=" + userName + ", gender=" + gender
            + "]";
}

}

Now when you print out the Array, the String created within the toString() method will print for each PersonDetail object.

Answer 3

You should use System.out.println(Arrays.asList(userRemoveArray)); . or

for(int i = 0; i < userRemoveArray.length;i++) {
  System.out.print(userRemoveArray[i]+", ");
}
System.out.println();