All Methods Instance Methods Concrete Methods Modifier and Type Method Description
hashCode()Returns a hash code value for the object.
toString()Returns a string representation of the object.
public int hashCode()Description copied from class:
ObjectReturns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by
The general contract of
- Whenever it is invoked on the same object more than once during
an execution of a Java application, the
hashCodemethod must consistently return the same integer, provided no information used in
equalscomparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the
equals(Object)method, then calling the
hashCodemethod on each of the two objects must produce the same integer result.
- It is not required that if two objects are unequal
according to the
Object.equals(java.lang.Object)method, then calling the
hashCodemethod on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by class
Objectdoes return distinct integers for distinct objects. (The hashCode may or may not be implemented as some function of an object's memory address at some point in time.)
- Whenever it is invoked on the same object more than once during an execution of a Java application, the
public String toString()Description copied from class:
ObjectReturns a string representation of the object. In general, the
toStringmethod returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.
toStringmethod for class
Objectreturns a string consisting of the name of the class of which the object is an instance, the at-sign character `
@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())