如何访问private package类的public member？

Question

privatePackageClass.java:

package simple.PrivatePackage;

class PrivatePackageClass {
    public static void print(Object obj) {
        System.out.println(obj);
    }
}

publicAccessClass.java

package simple;

import simple.PrivatePackage.*;
import java.util.*;

public class PublicAccessClass {
    public static void main(String[] args) {
        PrivatePackageClass.print(Arrays.toString(args));
    }
}

这是对错误的描述：

如果有人能解释为什么会这样我会很感激。

Answer 1

我读过这本书《用Java思考》（第四版）。我也对这种说法感到困惑。

有些情况下，可能与陈述不完全相符，但可能作为补充说明。

我不确定这些案例是否适用，谢谢阅读，欢迎评论。

testMiscellaneous\Miscellaneous

package testMiscellaneous;

class Miscellaneous {
    public static void main(String[] args) {
        System.out.println("public static void main(String[] args) called");
    }
}

TestMiscellaneous/Miscellaneous.class（使用“javac”命令生成）

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package testMiscellaneous;

class Miscellaneous {
    Miscellaneous() {
    }

    public static void main(String[] var0) {
        System.out.println("public static void main(String[] args) called");
    }
}

运行此命令时：

java -classpath C:\projects\testThinkingInJava\src\main\java testMiscellaneous.Miscellaneous

PS C:\Users\pie> java -classpath C:\projects\testThinkingInJava\src\main\java testMiscellaneous.Miscellaneous
public static void main(String[] args) called
PS C:\Users\pie>

package testMiscellaneous;

class Miscellaneous {
    public static String staticMember = "staticMember";

    public static String staticMethod() {
        String s = "staticMethod";

        System.out.println("public static String staticMethod() called");

        return s;
    }

    public static void main(String[] args) {
        System.out.println("public static void main(String[] args) called");
    }
}

package testMiscellaneous;

public class Miscellaneous2 extends Miscellaneous {
}

C:\projects\testthinkinginjava\src\main\java\testthinkinginjava\application.java

package testThinkingInJava;

import testMiscellaneous.Miscellaneous2;

public class Application {
    String s = Miscellaneous2.staticMember;

    public static void main(String[] args) {
        Miscellaneous2 miscellaneous2 = new Miscellaneous2();

        String s2 = Miscellaneous2.staticMethod();

        System.out.println(s2);

        System.out.println(Miscellaneous2.staticMember);
    }
}

当运行应用程序时，您可以得到以下输出：

public static String staticMethod() called
staticMethod
staticMember

正如您所看到的：