classCastException

最新推荐文章于 2024-09-27 06:30:00 发布

原创最新推荐文章于 2024-09-27 06:30:00 发布 · 187 阅读

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本文深入探讨了Java内存模型中的Volatile关键字使用，通过具体代码示例展示了Volatile如何确保变量的可见性和一致性。同时，文章还涉及了类继承、位运算等Java核心概念。

class MyData{
   volatile int number = 0;
   public void addTo60(){
       this.number = 60;
   }
}
class Person{
   String name = "";
   String [] measurement = new String [] {"A","B","C"};
   public String getPersonName() {
       return name;
   }
}
class Student extends Person{
   int studentId = 0;
   public void showStudentId() {
       System.out.println("StudentId is " + studentId);
   }
}

public class VolatileDemo {
   public static void main(String[] args) {

       Student xiaoMing = (Student) new Person();
       if (xiaoMing instanceof Person) {
           System.out.println(xiaoMing.getPersonName());
       }else
       {
           System.out.println("error in classCastException.");
       }
       xiaoMing.getPersonName();
       int stepInt = 3;
       stepInt = stepInt << 4;
       System.out.println(">> " + stepInt);
       stepInt = stepInt >> 2;
       System.out.println(">> " + stepInt);

   }