Detailed explanation of private access modifiers for Java functions

private is a Java access modifier that restricts the accessibility of a function to only the class in which it is defined, including: the function cannot be accessed in other classes. The function is also not accessible in subclasses.

Detailed explanation of private access modifier of Java function

In Java,privateis an access modifier. It is used to limit the accessibility of functions. It is the most restrictive access modifier, allowing access to the function only within the class in which it is defined.

Syntax

privateThe modifier is applied before the function declaration, the syntax is as follows:

private void functionName() { // 函数体 }

Access rules

UseFunctions modified by the privatemodifier can only be accessed within the same class. This means:

• The function cannot be accessed from other classes.
• This function cannot be accessed from subclasses.

Practical case

Let us create a class namedPersonand define aprivatefunction in it to get the age:

class Person { private int age; public void setAge(int age) { this.age = age; } // `private` 函数只能在这个类中访问 private int getAge() { return age; } }

In themainmethod, we cannot directly access thegetAge()function because it is declared asprivate:

public class Main { public static void main(String[] args) { Person person = new Person(); person.setAge(25); // 编译器错误：getAge() 函数是私有的 // int age = person.getAge(); } }

In order to get the age, we need to set the age through the public functionsetAge(), and then use the getter function to get the age:

public class Main { public static void main(String[] args) { Person person = new Person(); person.setAge(25); int age = person.getAge(); // 通过 getter 函数获取年龄 } }

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