为什么子类不继承Java中超类的私有实例变量？
当您声明一个类的实例变量为私有时，如果尝试这样做，将无法在另一个类中访问它们，否则将生成编译时错误。
但是，如果您继承具有私有字段的类，包括该类的所有其他成员，则私有变量也将被继承并且可用于子类。
但是，您不能直接访问它们，否则将产生编译时错误。
示例
class Person{
private String name;
public Person(String name){
this.name = name;
}
public void displayPerson() {
System.out.println("Data of the Person class: ");
System.out.println("Name: "+this.name);
}
}
public class Student extends Person {
public Student(String name){
super(name);
}
public void displayStudent() {
System.out.println("Data of the Student class: ");
System.out.println("Name: "+super.name);
}
public static void main(String[] args) {
Student std = new Student("Krishna");
}
}编译时错误
Student.java:17: error: name has private access in Person
System.out.println("Name: "+super.name);
^
1 error要访问超类的私有成员，您需要使用setter和getter方法，并使用子类对象对其进行调用。
示例
class Person{
private String name;
public Person(String name){
this.name = name;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
public void displayPerson() {
System.out.println("Data of the Person class: ");
System.out.println("Name: "+this.name);
}
}
public class Student extends Person {
public Student(String name){
super(name);
}
public void displayStudent() {
System.out.println("Data of the Student class: ");
}
public static void main(String[] args) {
Student std = new Student("Krishna");
System.out.println(std.getName());
}
}输出结果
Krishna