equalsとhashCode
2258 ワード
public class Person
{
private int id;
private String name;
private String password;
private double salary;
private int hashCode;
public Person(int id,String name,String password,double salary) {
this.id = id;
this.name = name;
this.password = password;
this.salary = salary;
}
public boolean equals(Object obj) {
if (this == obj)
{
return true;
}
if (!(obj instanceof Person))
{
return false;
}
Person other = (Person)obj;
if (this.id != other.id)
{
return false;
}
if (!nullSafeEquals(this.name,other.name))
{
return false;
}
if (!nullSafeEquals(this.password,other.password))
{
return false;
}
if (Double.doubleToLongBits(this.salary) != Double.doubleToLongBits(other.salary))
{
return false;
}
return true;
}
private boolean nullSafeEquals(Object obj1,Object obj2) {
return obj1 == null ? obj2 == null : obj1.equals(obj2);
}
public int hashCode() {
if (hashCode == 0)
{
int result = 17;
result = result * 37 + this.id;
result = result * 37 + (this.name == null ? 0 : this.name.hashCode());
result = result * 37 + (this.password == null ? 0 : this.password.hashCode());
long temp = Double.doubleToLongBits(this.salary);
int salaryInt = (int)(temp ^ (temp >>> 32));
result = result * 37 + salaryInt;
hashCode = result;
}
return hashCode;
}
public String toString() {
return super.toString() + ": [" + this.name + "]";
}
}