java子类数组的引用转换成超类数组的引用

Posted 2021-01-10 薰衣草

public class Person {
    
}

 

public class Student extends Person{
    private String name;

    public Student(String name) {
        this.name = name;
    }

    public Student() {
    }

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "Student{" +
                "name=\'" + name + \'\\\'\' +
                \'}\';
    }
}

 

public class Test01 {
    public static void main(String[] args) {

        //java中子类数组的引用可以转换为超类数组的引用，而不需要采用强制类型转换。
        Student[] student = new Student[5];

        //但是student和objs引用的是同一个对象
        Person[] person = student;

        //如果试图存储一个Person类型的引用就会引发ArrayStoreException异常
        person[0] = new Person();

    }
}