School.java

public class School {
    private final String name;
    private final String nickname;

    public School(String name, String nickname) {
        this.name = name;
        this.nickname = nickname;
    }

    @Override
    public int hashCode() {
        return 1;
    }

    @Override
    public boolean equals(Object other) {
        if( other instanceof School ) {
          School otherSchool = (School) other;
          return nullSafeEquals( name, other.name ) || nullSafeEquals( nickname, other.nickname );
        } 
        return false;
    }
    
    private boolean nullSafeEquals( Object alpha, Object beta ) {
        // Could be Object.equals() in Java 7.
        return alpha == beta || ( alpha != null && alpha.equals( beta ) );
    }
}