Lombok

import java.util.Arrays;
public class EqualsAndHashCodeExample {
 private transient int transientVar = 10;
 private String name;
 private double score;
 private Shape shape = new Square(5, 10);
 private String[] tags;
 private transient int id;
 
 public String getName() {
   return this.name;
 }
 
 @Override public boolean equals(Object o) {
   if (o == this) return true;
   if (!(o instanceof EqualsAndHashCodeExample)) return false;
   EqualsAndHashCodeExample other = (EqualsAndHashCodeExample) o;
   if (!other.canEqual((Object)this)) return false;
   if (this.getName() == null ? other.getName() != null : !this.getName().equals(other.getName())) return false;
   if (Double.compare(this.score, other.score) != 0) return false;
   if (!Arrays.deepEquals(this.tags, other.tags)) return false;
   return true;
 }
 
 @Override public int hashCode() {
   final int PRIME = 59;
   int result = 1;
   final long temp1 = Double.doubleToLongBits(this.score);
   result = (result*PRIME) + (this.name == null ? 43 : this.name.hashCode());
   result = (result*PRIME) + (int)(temp1 ^ (temp1 >>> 32));
   result = (result*PRIME) + Arrays.deepHashCode(this.tags);
   return result;
 }
 
 protected boolean canEqual(Object other) {
   return other instanceof EqualsAndHashCodeExample;
 }
 
 public static class Square extends Shape {
   private final int width, height;
   
   public Square(int width, int height) {
     this.width = width;
     this.height = height;
   }
   
   @Override public boolean equals(Object o) {
     if (o == this) return true;
     if (!(o instanceof Square)) return false;
     Square other = (Square) o;
     if (!other.canEqual((Object)this)) return false;
     if (!super.equals(o)) return false;
     if (this.width != other.width) return false;
     if (this.height != other.height) return false;
     return true;
   }
   
   @Override public int hashCode() {
     final int PRIME = 59;
     int result = 1;
     result = (result*PRIME) + super.hashCode();
     result = (result*PRIME) + this.width;
     result = (result*PRIME) + this.height;
     return result;
   }
   
   protected boolean canEqual(Object other) {
     return other instanceof Square;
   }
 }
}