OnJava8-Examples/generics/FilledList.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// generics/FilledList.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

import java.util.function.*;

import onjava.*;

public class FilledList<T> extends ArrayList<T> {

FilledList(Supplier<T> gen, int size) {

Suppliers.fill(this, gen, size);

}

public FilledList(T t, int size) {

for(int i = 0; i < size; i++)

this.add(t);

}

public static void main(String[] args) {

List<String> list = new FilledList<>("Hello", 4);

System.out.println(list);

// Supplier version:

List<Integer> ilist = new FilledList<>(() -> 47, 4);

System.out.println(ilist);

}

/* Output:

[Hello, Hello, Hello, Hello]

[47, 47, 47, 47]