I have two List<String>
:
[Adam, Louis, Gorge]
[Backer, Kabi, Tamis]
and I want to combine them to produce one List<String>
:
[Adam Backer, Louis Kabi, Gorge Tamis]
My code:
List<String> firstNames = new ArrayList<String>();
List<String> surNames = new ArrayList<String>();
firstNames.addAll(surNames);
My output:
[Adam, Louis, Gorge, Backer, Kabi, Tamis]
You could do something like this:
final ArrayList<String> merged = new ArrayList<(firstNames.size());
for (int i = 0; i < firstNames.size(); ++i) {
merged.add(firstNames.get(i) + " " + surNames.get(i);
}
//Here is the code for this
//First Create a new List that contained the merged result
//then use a for loop to concat them
import java.util.ArrayList;
import java.util.List;
public class FullName {
public static void main(String [] args)
{
List<String> firstName = new ArrayList<String>();
firstName.add("Adam");
firstName.add("Louis");
firstName.add("Gorge");
List<String> surName = new ArrayList<String>();
surName.add("Backer");
surName.add("Kabi");
surName.add("Tamis");
//Here just make a new List to store to first and sur name together
List<String> fullName = new ArrayList<String>();
//use a for loop
//Simplest way to merge both List together
for(int i=0;i<firstName.size();i++)
{
fullName.add(firstName.get(i)+" "+surName.get(i));
}
//Displaying the results
for(int i=0;i<fullName.size();i++)
System.out.println(fullName.get(i));
}
}
If list2
is mutable, you can do it in one line:
list1.replaceAll(s -> s + " " + list2.remove(0));
This is a good use case for the StreamEx library's zip
method:
import one.util.streamex.StreamEx;
// . . .
List<String> fullNames = StreamEx.zip(firstNames, surNames,
(first, sur) -> first + " " + sur)
.toList();
To use the StreamEx library you will have to add it as a dependency. For example, if you are using Maven:
<dependencies>
<dependency>
<groupId>one.util</groupId>
<artifactId>streamex</artifactId>
<version>0.8.1</version>
</dependency>
</dependencies>
Alternatively, you can do the same thing with pure Java, but it is a little more verbose:
import java.util.stream.Collectors;
import java.util.stream.IntStream;
// . . .
List<String> fullNames = IntStream.range(0, Math.min(firstNames.size(), surNames.size()))
.mapToObj(n -> firstNames.get(n) + " " + surNames.get(n))
.collect(Collectors.toList());
If you are on Java 16 or later you can replace the last line with:
.toList();
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