35 lines
999 B
Java
35 lines
999 B
Java
// collectiontopics/FillingLists.java
|
|
// (c)2021 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://OnJava8.com for more book information.
|
|
// Collections.fill() & Collections.nCopies()
|
|
import java.util.*;
|
|
|
|
class StringAddress {
|
|
private String s;
|
|
StringAddress(String s) { this.s = s; }
|
|
@Override public String toString() {
|
|
return super.toString() + " " + s;
|
|
}
|
|
}
|
|
|
|
public class FillingLists {
|
|
public static void main(String[] args) {
|
|
List<StringAddress> list = new ArrayList<>(
|
|
Collections.nCopies(4,
|
|
new StringAddress("Hello")));
|
|
System.out.println(list);
|
|
Collections.fill(list,
|
|
new StringAddress("World!"));
|
|
System.out.println(list);
|
|
}
|
|
}
|
|
/* Output:
|
|
[StringAddress@19e0bfd Hello, StringAddress@19e0bfd
|
|
Hello, StringAddress@19e0bfd Hello,
|
|
StringAddress@19e0bfd Hello]
|
|
[StringAddress@139a55 World!, StringAddress@139a55
|
|
World!, StringAddress@139a55 World!,
|
|
StringAddress@139a55 World!]
|
|
*/
|