Java 中的访问权限修饰符(Access Modifier)用于控制类、变量、方法、构造函数等的访问级别。Java 的访问权限修饰符共有四种: 1. public:表示该成员对于所有的类都是可见的,可以在任何地方被访问到。 2. protected:表示该成员被同一个包内的所有类可见,对于不同包中的子类也有效。 3. default(默认):即没有使用...
Protected Access Modifier - protected: Variables, methods and constructors which are declared protected in a superclass can be accessed only by the subclasses in other package or any class within the package of the protected members' class. The protected access modifier cannot be applied to class ...
Java SE 第二十七讲 访问控制符详解 1.访问修饰符(access modifier) ①public(公共的):被public所修饰属性和方法可以被所有类访问. ②protected(受保护的):被protected所修饰的属性和方法可以在类的内部,相同包以及该类的子类所访问(可以被子类所继承下来). ③private(私有的):被private所修饰的属性和方法只能在该...
No access modifier at all means that the method or variable defaults to package protected. This means that only the same class and any class in the same package has access. You get all of the same access as protected minus the ability for subclasses to access the method or variable (unless...
Protected Access Modifier When methods and data members are declared protected, we can access them within the same package as well as from subclasses. For example, class Animal { // protected method protected void display() { System.out.println("I am an animal"); } } class Dog extends Ani...
Thedefaultaccess modifier means we do not explicitly declare an access modifier for a class, field, method, etc. The default members are accessible only by the classes in the same package. Let us remove theprotectedaccess from thedisplayMessage()in theDataclass. It changes the access todefault...
protected:对同一包内(package)的类及子类可见(不能用于修饰外部class)。 1、default访问修饰符 使用默认修饰符修饰的变量和方法对于同一包的类是可见的,接口内变量隐式声明为public static final,而接口内的方法的访问修饰符默认为public。 2、private访问修饰符 ...
public > protected > package >private 注意: 4. But a subclass in another package can Access the protected members in the super-class via only the references of subclass or its subclasses. A subclass in the same package doesn’t have this restriction. This ensures that classes from other pack...
然后是protected , 然后是 package level (不包括access modifier )最后是private . (多个class放在一个java文件中的情况) 2.变量声明。首先是 public, 然后是protected然后是 package level (不包括access modifier )最后是private . (多个class放在一个java文件中的情况) ...
package com.journaldev.access; import com.journaldev.access.TestA; public class TestB { public static void main(String args[]) { new TestA().methodPublic(); new TestA().methodProtected(); new TestA().methodDefault(); } public void methodPublic() { ...