Detailed explanation of default access permission modifier of Java function

Java's default access modifier only allows classes in the same package to access functions, and it cannot be accessed by classes in other packages. Features include: 1. Can only be used for member functions in a class; 2. Access rights are lower than public and protected, but higher than private; 3. Cannot be used with other access rights modifiers at the same time.

Detailed explanation of default access permission modifier of Java function

In Java, we can use access permission modifiers to control the access permission of functions. Among them, thedefaultmodifier is a default access permission, which allows the function to be accessed by all classes in the same package, but not by classes in other packages.

Grammar

default void myFunction() { // 函数体 }

Practical case

We create a class namedMyClassand define adefaultmodification in it Function of symbol:

public class MyClass { default void myDefaultFunction() { System.out.println("这是 MyClass 中的默认函数。"); } }

In theOtherClassclass in another package, we try to call themyDefaultFunctionfunction:

public class OtherClass { public static void main(String[] args) { MyClass myClass = new MyClass(); myClass.myDefaultFunction(); // 编译错误 } }

As shown above, The compiler will report an error because themyDefaultFunctionfunction can only be accessed by classes in the same package, whileOtherClassbelongs to another package.

Note

When using thedefaultaccess permission modifier, you need to pay attention to the following points:

• defaultModifiers can only be used on member functions in a class, not constructors or static functions. The
• defaultmodifier has lower access rights thanpublicandprotected, but higher access rights thanprivate.
• defaultmodifier cannot be used with other access modifiers.

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