Java公共/私有和靜態修飾符如何影響在一行上聲明的多個變量？

Question

以下是等效的嗎？

private static boolean readAllFiles = false,readAllDirs = false;

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

如果是這樣，他們是否仍然擁有不同值的相同修飾符？

private static boolean readAllFiles = false,readAllDirs = true;

Answer 1

是的，它們是等價的，無論它們的初始值如何。

這是一些測試代碼來演示：

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

它們都是等價的。

你的上一個聲明：

private static boolean readAllFiles = false,readAllDirs = true;

相當於：

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