Use the Object class
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2020-03-08 10:35:20
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Description class java.lang.Object
- Object class is the root class for all classes java
- Object class declares only an empty argument constructor
- Method Object class are: equals () toString () hashCode () wait () notify () notifyAll () clone () getClass () fianlize ()
Description equals () methods:
- Only applies to reference data types
- This defines the class Object equals () == method and the same effects, the value of the address compare two objects are the same,
- Like String, Date, File, wrapper classes are rewriting the equals () method, it no longer compares address values, but to compare the contents are the same entity
- If the use of a custom class equals () method, it is usually rewritten way to make the comparison content entity
- == basic data types can be compared and the reference data type
- == comparison reference data when the type of reference data required to be the same type
Description toString () method:
- Our output when an object is referenced, the output is usually toString () method of the object
- Like String, Date, File, wrapper classes are rewriting the toString () method, the output of the information content of the entity
Origin www.cnblogs.com/zhangchp/p/12441024.html