OnJava8-Examples/arrays/SimpleSetAll.java

// arrays/SimpleSetAll.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.
import java.util.*;
import static onjava.ArrayShow.*;

class Bob {
  final int id;
  Bob(int n) { id = n; }
  @Override public String toString() {
    return "Bob" + id;
  }
}

public class SimpleSetAll {
  public static final int SZ = 8;
  static int val = 1;
  static char[] chars = "abcdefghijklmnopqrstuvwxyz"
    .toCharArray();
  static char getChar(int n) { return chars[n]; }
  public static void main(String[] args) {
    int[] ia = new int[SZ];
    long[] la = new long[SZ];
    double[] da = new double[SZ];
    Arrays.setAll(ia, n -> n);                 // [1]
    Arrays.setAll(la, n -> n);
    Arrays.setAll(da, n -> n);
    show(ia);
    show(la);
    show(da);
    Arrays.setAll(ia, n -> val++);             // [2]
    Arrays.setAll(la, n -> val++);
    Arrays.setAll(da, n -> val++);
    show(ia);
    show(la);
    show(da);

    Bob[] ba = new Bob[SZ];
    Arrays.setAll(ba, Bob::new);               // [3]
    show(ba);

    Character[] ca = new Character[SZ];
    Arrays.setAll(ca, SimpleSetAll::getChar);  // [4]
    show(ca);
  }
}
/* Output:
[0, 1, 2, 3, 4, 5, 6, 7]
[0, 1, 2, 3, 4, 5, 6, 7]
[0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0]
[1, 2, 3, 4, 5, 6, 7, 8]
[9, 10, 11, 12, 13, 14, 15, 16]
[17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0]
[Bob0, Bob1, Bob2, Bob3, Bob4, Bob5, Bob6, Bob7]
[a, b, c, d, e, f, g, h]
*/