Java中protect的作用?
时间: 2024-06-01 09:07:57 浏览: 13
Java中的protect是一种访问修饰符,它的作用是控制类成员的可见性。当一个成员被声明为protected时,它可以被该类的子类访问,也可以被同一包中的其他类访问。
具体来说,使用protected修饰符可以让子类继承父类的成员变量和方法,并且在子类中可以直接访问这些被保护的成员。同时,其他类也可以通过子类来访问这些被保护的成员,但是不能直接访问。
需要注意的是,protected只能修饰类的成员变量和方法,不能修饰类本身或局部变量。另外,protected成员的访问权限比默认的包访问权限更高,但比public访问权限低。
相关问题
java中public private protect
Java中的public、private、protected是三种访问修饰符,用于限制类、方法、变量等的访问权限。
- public:公开的,可以在任何地方访问。
- private:私有的,只能在类内部访问。
- protected:受保护的,可以在类内部和子类中访问。
通常情况下,我们会使用 private 修饰符来保护类的内部状态,使用 public 修饰符来暴露类的接口,而 protected 修饰符则用于在继承关系中使用。
java protect
Java provides several mechanisms to protect software from unauthorized access and modifications. Some of the common techniques are:
1. Obfuscation: It is a process of modifying the source code to make it difficult to read and understand. Obfuscation techniques include renaming variables, methods, and classes, removing comments, and adding irrelevant code.
2. Encryption: It is a process of converting the original code into a secret code that can be decrypted only with a key. Java provides several classes for encryption, such as Cipher and SecretKey.
3. Digital Signature: It is a mechanism to ensure the authenticity and integrity of the code. A digital signature is a mathematical algorithm that is used to verify that the code has not been tampered with.
4. Access Control: It is a mechanism to restrict access to certain parts of the code or data. Java's access control mechanism is based on the concept of classes, interfaces, and methods.
5. Code Signing: It is a mechanism to verify the identity of the code publisher and ensure that the code has not been modified since it was signed. Java provides a tool called jarsigner to sign and verify the code.
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