前言

今天是星期六，學習與不學習也一直在我的腦海裡做鬥爭，學習與不學習都有各自的理由，最終依舊選擇學習，因為害怕一旦自己停下來就變得懶惰，變得懈怠，無論自己學一節課還是半節課也要堅持學下去。加油！！！

正文

靜態static關鍵字描述

一旦使用static關鍵字那麼內容不屬於自己屬於類

package Demo02;

public class Demo01Static {
    public static void main(String[] args) {
        Student one =new Student("張三",23);
        one.room ="101教室";
        System.out.println(
 
"姓名:"+one.getName()+",年齡:"
                +one.getAge()+"，教室:"+one.room+",學號："+one.getId());
        Student two =new Student("李四",34);
        System.out.println("姓名:"+two.getName()+",年齡:"
                +two.getAge()+"，教室:"+two.room+",學號："+two.getId());

    }
}

package Demo02;

public class Student {
    
 
private  String name;//姓名
    private  int age;//年齡
    static String room;//所在教室
    private int id;
    private  static  int jsq=100;


    public Student(){
        this.id=++jsq;
    }
    //有參構造
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
        this.id=++jsq;
    }
    
 
//全參構造

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}