### Question:
Code implements Serializable { @Override public int hashCode(){ return system.hashCode() + code.hashCode()*37; } Code();  Code(String system, String code, String display);  Code(Code otherCode);  Code(Coding coding); static Code getNewCode(); String getSystem(); Code setSystem(String system); String getCode(); Code setCode(String code); String getDisplay(); Code setDisplay(String display); @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testhashCode() { Code code1 = Code.getNewCode().setSystem("http: Code code2 = Code.getNewCode().setSystem("http: assertEquals(code1.hashCode(), code2.hashCode()); Code code3 = Code.getNewCode().setSystem("http: assertEquals(code1.hashCode(), code3.hashCode()); Code code4 = Code.getNewCode().setSystem("http: assertNotEquals(code1.hashCode(), code4.hashCode()); Code code5 = Code.getNewCode().setSystem("http: assertNotEquals(code1.hashCode(), code5.hashCode()); Code code6 = Code.getNewCode().setSystem("http: assertEquals(code1.hashCode(), code6.hashCode()); }