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package com.zetcode;

import java.util.ArrayList;

import java.util.List;

public class GenericConcatListEx {

public static void main(String[] args) {

var vals1 = List.of(1, 2, 3);

var vals2 = List.of(4, 5, 6);

var vals3 = List.of(7, 8, 9);

var vals = concatenate(vals1, vals2, vals3);

System.out.println(vals);

var words1 = List.of("pen", "paper", "ink");

var words2 = List.of("sky", "cloud", "wind");

var words3 = List.of("tree", "forest", "wood");

var words = concatenate(words1, words2, words3);

System.out.println(words);

}

@SafeVarargs

private static <T> List<T> concatenate(List<T>... lists) {

return new ArrayList<>() {{

for (List<T> mylist : lists) {

addAll(mylist);

}

}};

}

}