Resolve "Game of life part 2"

Closes #106 (closed)

game-of-life/src/main/java/fr/ippon/life/Cell.java

@@ -2,24 +2,16 @@ package fr.ippon.life;
 
 import java.util.Set;
 
-public class Cell {
-
+public record Cell(int row, int column) {   
   private static final int LOW_POPULATION_THRESHOLD = 2;
   private static final int HIGH_POPULATION_THRESHOLD = 3;
   private static final int BORN_THRESHOLD = HIGH_POPULATION_THRESHOLD;
 
-  private final int row;
-  private final int column;
-
-  public Cell(int row, int column) {
-    this.row = row;
-    this.column = column;
-  }
-
   boolean stayAlive(Set<Cell> aliveCells) {
     long neighbourgCount = countNeigbours(aliveCells);
 
-    return neighbourgCount == LOW_POPULATION_THRESHOLD || neighbourgCount == HIGH_POPULATION_THRESHOLD;
+    return neighbourgCount == LOW_POPULATION_THRESHOLD
+        || neighbourgCount == HIGH_POPULATION_THRESHOLD;
   }
 
   boolean born(Set<Cell> aliveCells) {
@@ -27,7 +19,9 @@ public class Cell {
   }
 
   private long countNeigbours(Set<Cell> aliveCells) {
-    return aliveCells.stream().filter(this::isNeighbour).count();
+    return aliveCells.stream()
+        .filter(this::isNeighbour)
+        .count();
   }
 
   private boolean isNeighbour(Cell other) {
@@ -35,38 +29,11 @@ public class Cell {
       return false;
     }
 
-    return delta(row, other.row) <= 1 && delta(column, other.column) <= 1;
+    return delta(row, other.row) <= 1
+        && delta(column, other.column) <= 1;
   }
 
   private static int delta(int first, int second) {
     return Math.abs(first - second);
   }
-
-  public int getRow() {
-    return row;
-  }
-
-  public int getColumn() {
-    return column;
-  }
-
-  @Override
-  public int hashCode() {
-    final int prime = 31;
-    int result = 1;
-    result = prime * result + column;
-    result = prime * result + row;
-    return result;
-  }
-
-  @Override
-  public boolean equals(Object obj) {
-    if (this == obj) return true;
-    if (obj == null) return false;
-    if (getClass() != obj.getClass()) return false;
-    Cell other = (Cell) obj;
-    if (column != other.column) return false;
-    if (row != other.row) return false;
-    return true;
-  }
 }