静态static关键字概述和修饰成员变量

静态static关键字概述

 静态static关键字修饰成员变量

案例：

Student7类：

private int id;
private String name;
private int age;
static String room;
private static int idCounter=0;

public Student7() {
    this.id =++idCounter;
}

public Student7(String name, int age) {
    this.name = name;
    this.age = age;
    this.id =++idCounter;
}

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;
}

DemoStaticTest7类：

public static void main(String[] args) {
    Student7 one = new Student7("吴磊",18);
    one.room="101教室";
    System.out.println("姓名："+one.getName()+",年龄："+one.getAge()
            +",教室："+one.room+",学号："+one.getId());

    Student7 two = new Student7("赵露思", 18);
    System.out.println("姓名："+two.getName()+",年龄："+two.getAge()
            +",教室："+two.room+",学号："+two.getId());
}