类和对象的学习

//类名
public class school {
  //属性
  String name; //名称
  int jsNumber; //教室数目
  int jfNumber;//机房数目
  //方法
  public void show(){
    System.out.println("名称: "+ name + "教室数目" + jsNumber + " , 机房数目：" + jfNumber);
 }
}

public class Demo01 {
  public static void main (String[] args){
    //声明
    School school;
    //分配空间
    school = new School();
    //点访问属性
    school.name = "华夏高中";
    school.jsNumber = 36;
    school.JFNumber = 8;
    school.show();
 }
}

public class Demo01 {
  public static void main (String[] args){
    //声明
    //School school;
    School school = new School();
    //点访问方法
    school.show(); //名称：null，教室数目：0，机房数目：0
    //点访问属性
    school.name = "华夏高中";
    school.jsNumber = 81;
    school.JFNumber = 9;
    school.show();
 }
}

public static void main(Stringl] args)]{
  Scanner scanner = new Scanner(System.in);
  while (true) {
    System.out.print("请输入姓名:");
    String name = scanner.next(); 
    if (name.equals("n")) break; 
    // 提供了一个退出通道  
    System.out.print("请输入年龄:");
    int age = scanner.nextInt();
    Visitor visitor = new Visitor();
     // 创建对象
     visitor.name = name :
     visitor.age = age;
     visitor.show();
     }
System.out.println("退出程序");
}