Java public/private 和 static 修饰符如何影响一行中声明的多个变量？

Question

以下内容等价吗？

private static boolean readAllFiles = false,readAllDirs = false;

private static boolean readAllFiles = false;
private static boolean readAllDirs = false;

如果是这样，它们是否仍然具有具有不同值的相同修饰符？

private static boolean readAllFiles = false,readAllDirs = true;

Answer 1

是的，无论它们的初始值如何，它们都是等效的。

下面是一些测试代码来演示：

public class TestClass
{
  private static boolean readAllFiles = false,readAllDirs = true;

  public static void main(String[] args)
  {
    //these two would result in COMPILE error if both vars were not static
    System.out.println("readAllFiles: " + readAllFiles);
    System.out.println("readAllDirs: " + readAllDirs);
  }
}

---

public final class TestClass2
{
  public static void main(String[] args)
  {
    //these two DO result in COMPILE error, because both vars are private
    System.out.println("TestClass.readAllFiles: " + TestClass.readAllFiles);
    System.out.println("TestClass.readAllDirs: " + TestClass.readAllDirs);
  }
}

Answer 2

它们都是等价的。

您的最后一条语句：

private static boolean readAllFiles = false,readAllDirs = true;

相当于：

private static boolean readAllFiles = false;
private static boolean readAllDirs = true;