我正在研究Java(OOP)中的构造函数,但无法弄清楚构造函数可以访问哪种类型的变量?构造函数可以访问以下哪些变量?
我创建了以下示例来详细说明我的问题:
public class constructorAccess {
public int marks; // 3. Public instance variable
private String firstName; // 2. Private instance variable
static final String LASTNAME = "Smith"; // 4. Static variable
public static void studentId(){
int id; // 1. Local variable inside method
id = 5;
System.out.println(id);
}
public constructorAccess(int marks, String firstName) {
this.marks = marks;
this.firstName = firstName;
}
}
是否可以从constructorAccess访问id
(1。在studentId方法中声明的局部变量)和LASTNAME
(4.在类中声明的静态变量)?
public constructorAccess(int marks, String firstName) {
this.marks = marks;
this.firstName = firstName;
// How can I use id variable here from studentId method?
// How can I use LASTNAME static variable here?
}
我用它访问了私有和公共实例变量。引用,但LASTNAME
和id
变量给我错误(创建一个局部变量)。