Java中靜态變量(類變量)、執行個體變量、局部變量和成員變量

package com.cunyu.demo

public class Demo {

    private String name;  //成員變量、執行個體變量
    private int age;  //成員變量、執行個體變量
    private int ID;  //成員變量、執行個體變量

    public static final String school = "卡塞爾學院";  //成員變量、靜态變量(類變量)
    public static String level = "SSS";    //成員變量、靜态變量(類變量)

    public int getAge() {
        return age;
    }

    public int getId() {
        return ID;
    }

    public String getName() {
        return name;
    }

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

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

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

    public void study(){
            String subject1 = "屠龍";  //局部變量
            String subject2 = "煉金術"; //局部變量
            System.out.println("學習科目： " + subject1 + "、" + subject2);
        }

    public static void main(String[] args) {
        Demo demo = new Demo();
        demo.setAge(23);
        demo.setId(14000001);
        demo.setName("楚子航");
        System.out.println("ID: " + demo.getId() + "Age: " + demo.getAge() + "Name: " + demo.getName());
        System.out.print("主修科目： ");
        demo.study();
        System.out.println("學院：" + Demo.school);
        System.out.println("等級：" + Demo.level);
    }
}