Hanshunping Java Note 8th Lecture this class variable 9th lecture class method

1. class variable is static

　　public class demo{

public static void Main (string[] args) {

Child ch1 = new Child (3, "Niuniu");

Ch1.joingame ();

Child CH2 = new Child (4, "small");

Ch2.joingame ();

Child CH3 = new Child (5, "big");

Ch3.joingame ();

SYSTEM.OUT.PRINTLN ("total =" +child.total);

}

}

Class child{

int age;

String name;

static int total=0;

Public child (int age,string name) {

This.age=age;

This.name=name;

}

public void Joingame () {

total++;

}

}

2. class method

public class demo{

public static void Main (string[] args) {

Stu stu1 = new Stu ("AA", 340);

Stu STU2 = new Stu ("BB", 240);

System.out.println (Stu.gettotalfee ());

}

}

Class stu{

int age;

String name;

int fee;

static int totalfee;

Public Stu (int age,string name,int fee) {

This.age = age;

THIS.name = name;

Totalfee+=fee;

}

public static int Gettotalfee () {//This is a static method

return totalfee;

Age ++;//wrong,

}

}

Static Statics methods can access static static variables, cannot access non-static variables, and non-static methods can access both statically and non-static variables.

Hanshunping Java Note 8th Lecture this class variable 9th lecture class method