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, the default modifier 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 named MyClass and define a default modification in it Function of symbol:

public class MyClass {

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

}

In the OtherClass class in another package, we try to call the myDefaultFunction function:

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 the myDefaultFunction function can only be accessed by classes in the same package, while OtherClass belongs to another package.

Note

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

• default Modifiers can only be used on member functions in a class, not constructors or static functions. The
• default modifier has lower access rights than public and protected, but higher access rights than private.
• default modifier cannot be used with other access modifiers.

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