java類基礎

標籤：

class Person {    private String name;    private int age;        {        //構造代碼塊：可以給【所有】對象進行初始化的        //放建構函式裡的，共性初始化代碼    //執行順序：1.靜態代碼塊，2.構造代碼塊，3.建構函式        System.out.println("Person run.");    }        static String country = "CN";        public void speak() {        System.out.println(name+":"+age);            }        Person() {        name = "baby";        age = 1;    }        Person(String n, int a) {        age = a;        name = n;    }        public void setName(String n) {        name = n;            }}class ConsDemo {    public static void main (String[] args) {        Person p = new Person();        p.speak();                Person p2 = new Person("旺財", 16);        p2.setName("WangWang");        p2.speak();                System.out.println(Person.country);                System.out.println(args);        System.out.println(args.length);        try {            System.out.println(args[0]);        } catch (Exception e) {            System.out.println("log error:"+e);        }                StaticCode.show(); //靜態類，類名進行方法調用    }    }class StaticCode {        static int num;    static { //靜態代碼塊，進行類的初始化                num = 10;        System.out.println("Static init.");    }        static void show() {        System.out.println(num);               }}

 

java類基礎