tsk2.java

package some;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicReference;

public class tsk2 {

 static void prt(Object a) {
 System.out.println(a);
 }

 static record hm(
 int ag,
 String fn,
 String ln,
 LocalDate bd,
 int w
 ) {}

 public static void main(String[] args) {
 final var a = new ArrayList<hm>();
 a.add(new hm(1, "a", "a",
 LocalDate.of(1999, 2, 1), 10));
 a.add(new hm(2, "b", "b",
 LocalDate.of(1998, 1, 1), 20));
 a.add(new hm(3, "c", "c",
 LocalDate.of(1997, 1, 1), 30));
 a.add(new hm(4, "d", "d",
 LocalDate.of(1996, 1, 1), 40));
 a.add(new hm(5, "e", "e",
 LocalDate.of(1999, 1, 5), 50));

 var c = a.stream().map(b -> new hm(b.ag, b.fn, b.ln, b.bd, b.w - 5));
 c = c.filter(d -> d.bd().isBefore(LocalDate.of(1999, 1, 3)));

 var _a = c.toList();
 prt(_a);

 var d = new AtomicReference<String>();
 d.set("");
 _a.forEach(e -> d.set(d.get() + e.ln + ' '));
 prt(d.get());
 }
}