Java object-oriented-1

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The code and notes are as follows:

CLASS PERSON{//member variable string name;integer age;//static variable static string address= "China";//construction method// Two constructor methods in the same class, but also the same name, only the parameter is different//This method phenomenon, is the method overload. If there is a method of the parent class, the subclass also has an identical, even//parameter method, just the statement (method code block) that implements this method//different, this method phenomenon, is the method rewrite. Public person () {///default construction method/* The default constructor is not writable, but when you write a custom construction method, the default constructor method is overwritten. That is, if you write the following construction method, but disdain this empty construction method so: Person p = new person (); This statement will go wrong because New person () Represents a constructor method that calls an empty argument. To succeed is to write: Person p = new person ("Lisi", 23); This statement calls the two arguments and the first is the string type, the second is the integer type. */}public person (string name,integer age) {//with parameter custom construction method/* Where the This pointer represents this object, for example: when we want to use the age and name variables in the class, This is used: Person p=new person ();p. Name= "Zhangsan";p. Age=25, and this refers to the instance when the class generates an instance, the above example represents the object p;*/ SYSTEM.OUT.PRINTLN ("Custom construction Method"); this.name=name;this.age=age;} Member Method Public void eat () {System.out.println ("eat ...");} Public void toprint () {System.out.println ("name=" +this.name+ "\nage=" +this.age);} static method Public static void staticfun () {SYSTEM.OUT.PRIntln ("static method ....");} Class main{public static void main (String[] args) {person person = new  person (); System.out.println ("*************"); Person person1 = new person ("Zhangsan", 25); System.out.println ("*************");p erson.name= "Lisi";p erson.age=12;person.eat ();p erson.toprint (); System.out.println ("*************");p erson1.eat ();p erson1.toprint ();/* Static is a representation of a method or variable modified by static, etc., belonging to a class, that is, This is not required for static modification: Person person = new person ();p erson.staticfun (); Instead, it can be accessed directly through the class: Person.staticfun (); *///the first four sentences, is the traditional access mode//After two sentences are directly accessed through the class. Person.staticfun (); System.out.println (person.address);p erson1.staticfun (); System.out.println (person1.address); Person.staticfun (); System.out.println (person.address);}}

Run:

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Java object-oriented-1