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Converting List of objects to an Array of Strings


Converting List of objects to an Array of Strings

By : user2949490
Date : November 17 2020, 01:00 AM
I think the issue was by ths following , In my main class, I have: List allPeople = new ArrayList<>();
code :
public String[] getAllId() {
    return allPeople.stream().map(Person::getId).toArray(String[]::new);
}


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Converting a Vector of Objects to array of Strings

Converting a Vector of Objects to array of Strings


By : Eremes
Date : March 29 2020, 07:55 AM
hop of those help? You cannot cast an object into the return type of that objects toString method. You have to build a new array by iterating over the Vector objects while calling toString.
code :
String[] stringArray = new String[mObjectVector.size()];
for (int i=0; i < mObjectVector.size(); i++) {
   stringArray[i] = mObjectVector.get(i).toString();
}
Groovy Converting List of objects to Comma Separated Strings

Groovy Converting List of objects to Comma Separated Strings


By : clawsn
Date : March 29 2020, 07:55 AM
Hope that helps Try currenciesList.code.join(", "). It will create list at background, but it's minimal code solution.
Also do you know, that your code may be even Groovier? Look at Canonical or TupleConstructor transformations.
code :
//This transform adds you positional constructor.
@groovy.transform.Canonical 
class CurrencyType {
  int id
  String code
  String currency
}

def currenciesList = [
     new CurrencyType(1,"INR", "Indian Rupee"),
     new CurrencyType(1,"USD", "US Dollar"),
     new CurrencyType(1,"CAD", "Canadian Dollar")
]

//Spread operation is implicit, below statement is same as
//currenciesList*.code.join(/, /)
currenciesList.code.join(", ")
Converting a List of Strings to a List of custom made objects in Java using Lambda Expression

Converting a List of Strings to a List of custom made objects in Java using Lambda Expression


By : Manucci
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If you add a constructor to your Person class that takes a string, you can just use:
code :
List<Person> people = persons.stream()
    .map(Person::new)
    .collect(Collectors.toList());
List<Person> people = persons.stream()
    .map(s -> { Person p = new Person(); p.setName(s); return p; })
    .collect(Collectors.toList());
Converting a list of unicode objects to a list of strings

Converting a list of unicode objects to a list of strings


By : Alejandro Zuluaga Mo
Date : March 29 2020, 07:55 AM
it helps some times I have a list of unicode objects names and I'm trying to produce a new list parsed_names so that the objects with a single name are converted to strings and the objects with a list of names are converted to a list of strings: , You need to use extend instead of append for sub-lists:
code :
import ast

parsed_names = []
for n in names:
    try:
        sub_list = ast.literal_eval(n)
        parsed_names.extend(sub_list)
    except ValueError:
        parsed_names.append(str(n))
>>> parsed_names
['Johnny', 'Tamir', 'Josh', 'Brad']
temp = [ast.literal_eval(n) if '[' in n else str(n) for n in names]
#  ['Johnny', ['Tamir', 'Josh'], 'Brad']

res = []

for item in temp:
    if isinstance(item, list):
        res.extend(item)
    else:
        res.append(item)
Converting an array of arrays to list of JSON objects instead of JSON strings

Converting an array of arrays to list of JSON objects instead of JSON strings


By : pan charles
Date : March 29 2020, 07:55 AM
will be helpful for those in need You could generate an array with the objects first and the stringify the array.
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