select array of class objects field

I have an enum and a class with two fields:

enum types {
    nan,
    num,
    text,
    col,
    dress
  };
class GeneType {
  String name;
  types type;
  GeneType(String name, types type) {
    this.name = name;
    this.type = type;
  }
}

I have also array of objects that are using this class

final GeneType[][] geneNames = new GeneType[][]{
  {
    new GeneType("Unknown", types.nan),
    new GeneType("Age", types.num),
    new GeneType("Fav number", types.num),
    new GeneType("Height", types.num),
    new GeneType("Name", types.text)
  },
  {
    new GeneType("Unknown", types.nan),
    new GeneType("Not Sure", types.nan),
    new GeneType("This", types.nan),
    new GeneType("That", types.nan),
    new GeneType("The other", types.nan),
    new GeneType("Eye color", types.col),
    new GeneType("Fav color", types.col),
    new GeneType("Name", types.text)
  }
}

I wand to select array of names using the simplest method to set tab names (String[])

new Tabs(x, y, wid, hei, orientation, thingsToShow,
 geneNames[howMuchDataNeed(thingsToShow.size())].name)

thingsToShow is arrayList of otherClass

How to select array of geneNames[index].name?

From geneNames[index] you will get one of the internal arrays based on the index value you have provided. For example, if geneNames[0] is called, you will get the following array as the result.

[
    new GeneType("Unknown", types.nan),
    new GeneType("Age", types.num),
    new GeneType("Fav number", types.num),
    new GeneType("Height", types.num),
    new GeneType("Name", types.text)
]

Then what you require is to map this array of GeneType objects to an array of their corresponding names. For that, you can use Java's stream APIs as follows.

String[] names = Arrays.stream(geneNames[index])
        .map(gene -> gene.name)
        .toArray(String[]::new);

Update: Implementation without using Java stream APIs

GeneType[] selected = geneNames[index];
String[] names = new String[selected.length];
for (int i = 0; i < selected.length; i++) {
    names[i] = selected[i].name;
}

Try this.

int index = 1;
String[] names = Arrays.stream(geneNames[index])
    .map(gene -> gene.name)
    .toArray(String[]::new);
System.out.println(Arrays.toString(names));

output:

[Unknown, Not Sure, This, That, The other, Eye color, Fav color, Name]

You can do this using toString() overriding method in GeneType class.
I hope this code will help you.

import java.util.ArrayList;
import java.util.Arrays;
enum types {
nan,
num,
text,
col,
dress
};
class GeneType {
String name;
types type;
GeneType(String name, types type) {
this.name = name;
this.type = type;
}
@Override
public String toString() {
return name;
}
}
class question {
public static void main(String[] args) {
final GeneType[][] geneNames = new GeneType[][]{
{
new GeneType("Unknown", types.nan),
new GeneType("Age", types.num),
new GeneType("Fav number", types.num),
new GeneType("Height", types.num),
new GeneType("Name", types.text)
},
{
new GeneType("Unknown", types.nan),
new GeneType("Not Sure", types.nan),
new GeneType("This", types.nan),
new GeneType("That", types.nan),
new GeneType("The other", types.nan),
new GeneType("Eye color", types.col),
new GeneType("Fav color", types.col),
new GeneType("Name", types.text)
}
};
ArrayList<GeneType> names = new ArrayList<>();
for (int i = 0; i < geneNames[0].length; i++) {
names.add(geneNames[0][i]);
}
System.out.println(names);
}
}

This isn't propably the best option, but it pass through.

String[] SelectNames(){
GeneType[] carry = geneNames[index];
String[] toReturn = new String[carry.length];
for(int i=0; i<toReturn.length; i++)
toReturn[i]=carry[i].name;
return toReturn;
}