Java 中受保护与私有访问修饰符
原文:https://www . geesforgeks . org/protected-vs-private-access-modifiers-in-Java/
访问修饰符是代码中决定变量范围的那些元素。正如我们所知，有三种可用的访问修饰符，即公共的、受保护的和私有的。让我们看看受保护和私有访问修饰符之间的区别。
访问修饰符 1: 受保护
声明为受保护的方法或变量可以在同一个包或不同的包中访问。通过使用受保护的关键字，我们可以声明受保护的方法/变量。
语法:
protected void method_name(){
......code goes here..........
}
示例:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate Protected Access Modifier
// Importing input output classes
import java.io.*;
// Main class
public class Main {
// Input custom string
protected String name = "Geeks for Geeks";
// Main driver method
public static void main(String[] args) {
// Creating an object of Main class
Main obj1 = new Main();
// Displaying the object content as created
// above of Main class itself
System.out.println( obj1.name );
}
}
Output
Geeks for Geeks
访问修饰符 2: 私有
声明为私有的方法或变量只能在声明它们的类中访问。通过使用 【私有】 关键字我们可以设置方法/变量私有。
语法:
private void method_name(){
......code goes here..........
}
示例:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate Private Access Modifier
// Importing input output classes
import java.io.*;
// Main class
public class Main {
// Input custom string
private String name = "Geeks for Geeks";
// Main driver method
public static void main(String[] args)
{
// Creating an object of Main class
Main obj1 = new Main();
// Displaying the object content as created
// above of Main class itself
System.out.println(obj1.name);
}
}
Output
Geeks for Geeks
现在，在了解了它们的内部工作机制之后，让我们来总结一下这些访问修饰符之间的主要区别。
| | **私人** | | --- | --- | | The key word used is' protected' | The keyword used is' private' | | Protected can be used within the same class. | Private can be used within the same class. | | Protected can be used in the same steamed stuffed bun class. | Private cannot be used in the same steamed stuffed bun class. | | Protected can be used in different steamed stuffed bun classes. | Private cannot be used in different steamed stuffed bun classes. | | Protected can package non-subclasses | Private cannot be used for different package non-subclasses |版权属于：月萌API www.moonapi.com，转载请注明出处
