Object class

 01、Object class ：  

        Object Class the parent of all classes . stay Java in , be-all Java Classes inherit directly or indirectly java.lang.Object class .Object It's all Java Ancestor of class . When defining a class , Not used extends keyword , That is, there is no explicit inheritance of a class , Then this class directly inherits O

bject class . All objects inherit the methods of this class .

        Implement a class that does not explicitly inherit a class ,Object Class is its immediate parent .

        Example ：

// The following two writing methods are equivalent 
（1） Writing a ：
public class Person{
	// Code 
}

（2） Write two ：
public class Person extends Object{
	// Code 
}

02、 Methods that are often rewritten

surface Object Partial methods of the class

Method	explain
toString()	Returns information about the current object itself , Return string object
equals()	Compare whether two objects are the same object , if , return true
clone()	Make a copy of the current object , And back to
hashCode()	Returns the hash code value of the object
getClass()	Get the class information of the current object , return Class object

03、toString() Method

04、equals() Method

• Object Class equals() Method ： Used to compare whether two objects are the same object , if , return true,
• String object equals() Method ： Used to compare whether the values of two strings are equal .

        Object Class equals() Method ：