對Equals()方法的重寫

標籤：重寫

//手動的實現equals()方法//    重寫Object類的equals(Object obj)方法，保證兩個對象若屬性值完全相等，則返回true    public boolean equals(Object obj){        if(this==obj){            return true;        }else if(obj instanceof Person){            Person p=(Person)obj;            return this.getId()==p.getId()&&this.getAge()==p.getAge()&&this.getName().equals(p.getName());        }else             return false;    }    @Override   public boolean equals(Object obj) {        if (this == obj) {            return true;        }        if (obj == null) {           return false;        }        if (!(obj instanceof Person)) {            return false;        }       Person other = (Person) obj;        if (age != other.age) {            return false;        }        if (id != other.id) {            return false;        }        if (name == null) {            if (other.name != null) {                return false;            }        } else if (!name.equals(other.name)) {            return false;        }       return true;    }

String類中對Equals()的重寫為：

  public boolean equals(Object anObject) {        if (this == anObject) {            return true;        }        if (anObject instanceof String) {            String anotherString = (String)anObject;            int n = value.length;            if (n == anotherString.value.length) {                char v1[] = value;                char v2[] = anotherString.value;                int i = 0;                while (n-- != 0) {                    if (v1[i] != v2[i])                        return false;                    i++;                }                return true;            }        }        return false;    }

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