java-record-builder-pattern.java

public record Point(int x, int y) {
   public static final class Builder {
     private int x;
     private int y;
     public Builder(Point point) {
       this.x = point.x();
       this.y = point.y();
     }
     public Builder x(int x) {
       this.x = x;
       return this;
       }
 public Builder y(int y) {
 this.y = y;
 return this;
 }
   public Point build() {
     return new Point(this.x, this.y);
   }
 }
}

var original = new Point(23, 42);
// => Point[x=23, y=42]
var updated = new Point.Builder(original)
 .x(5)
 .build();
// => Point[x=5, y=42]