Please help jave question

Does the hashCode method in class Robot below obey the equals/hashCode contract? If yes, what is bad about the hashCode method? If no, why does the hashCode method violate the contract? Also in about 1 sentence, describe an easy way to write a hashCode method for almost any class class Robot private int serialNumber private String name; public boolean equals(Object x) Robot that (Robot) x; return this.serialNumber that.serialNumber && this.name.equals(that.name); public int hashCode( [return 1234; )