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怎么在java中利用枚举对修饰符进行组合

这篇文章主要介绍了怎么在java中利用枚举对修饰符进行组合，此处通过实例代码给大家介绍的非常详细，对大家的学习或工作具有一定的参考价值，需要的朋友可以参考下：

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Java的特点有哪些

Java的特点有哪些 1.Java语言作为静态面向对象编程语言的代表，实现了面向对象理论，允许程序员以优雅的思维方式进行复杂的编程。 2.Java具有简单性、面向对象、分布式、安全性、平台独立与可移植性、动态性等特点。 3.使用Java可以编写桌面应用程序、Web应用程序、分布式系统和嵌入式系统应用程序等。

package model;
top class的修饰符组合
abstract final public
  * 2 * 2
warning:
abstract final 冲突
最终,共有2*(2*2-1)=6种修饰符组合用于top class
*/
/*
public abstract class PublicAbstractClass{}
public final  class PublicFinalClass{}
    abstract class AbstractClass{}
    final  class FinalClass{}
public     class PublicClass{}
        class Class{}
关于constructor的修饰符组合
abstract [DEFAULT] protected public
关于field的修饰符组合
    *  2   *   2   *   2     *  2
权限           静态的     瞬态的     同步的
private    缺省     缺省     缺省      缺省
缺省    (not final) (not static) (not transient) (not volatile)
protected
public     final    static    transient    volatile
warning:
volatile final 冲突
最终,共有4*2*2*(2*2-1)=48种修饰符组合用于field
关于method的修饰符组合
    *  2     *  2   *   2   *    2     *  2
权限                   静态的       同步的     本地的
private   缺省      缺省     缺省        缺省     缺省
缺省  (not abstract)  (not final) (not static) (not synchronized) (not native)
protected
public   abstract     final    static    synchronized    native
warning:
abstract 和 private 冲突
abstract 和 final 冲突
abstract 和 synchronized 冲突
abstract 和 static 冲突
abstract 和 native 冲突
所以abstract method 的修饰符组合只有三种:
     abstract
protected abstract
public  abstract
最终,共有4*2*2*2*2+3=67中修饰符组合用于method
*/
/**
 * 这个类列举了所有的用于字段的修饰符组合
 *         ├构造器的修饰符组合
 *         └方法的修饰符组合
 * @author zhangxingshuo
 */
abstract class A {
  /*fields*/
  /*transient and volatile*/
  private        transient volatile int privateTransientVolatileIntMemberField;
              transient volatile int transientVolatileIntMemberField;
  protected       transient volatile int protectedTransientVolatileIntMemberField;
  public         transient volatile int publicTransientVolatileIntMemberField;
//  private  final    transient volatile int privateFinalTransientVolatileIntMemberField=0;
//       final    transient volatile int finalTransientVolatileIntMemberField=0;
//  protected final    transient volatile int protectedFinalTransientVolatileIntMemberField=0;
//  public  final    transient volatile int publicFinalTransientVolatileIntMemberField=0;
  private     static transient volatile int privateStaticTransientVolatileIntMemberField;
          static transient volatile int staticTransientVolatileIntMemberField;
  protected    static transient volatile int protectedStaticTransientVolatileIntMemberField;
  public     static transient volatile int publicStaticTransientVolatileIntMemberField;
//  private  final static transient volatile int privateFinalStaticTransientVolatileIntMemberField=0;
//       final static transient volatile int finalStaticTransientVolatileIntMemberField=0;
//  protected final static transient volatile int protectedFinalStaticTransientVolatileIntMemberField=0;
//  public  final static transient volatile int publicFinalStaticTransientVolatileIntMemberField=0;
  /*not transient and volatile*/
  private              volatile int privateVolatileIntMemberField;
                    volatile int VolatileIntMemberField;
  protected             volatile int protectedVolatileIntMemberField;
  public               volatile int publicVolatileIntMemberField;
//  private  final          volatile int privateFinalVolatileIntMemberField=0;
//       final          volatile int finalVolatileIntMemberField=0;
//  protected final          volatile int protectedFinalVolatileIntMemberField=0;
//  public  final          volatile int publicFinalVolatileIntMemberField=0;
  private     static       volatile int privateStaticVolatileIntMemberField;
          static       volatile int staticVolatileIntMemberField;
  protected    static       volatile int protectedStaticVolatileIntMemberField;
  public     static       volatile int publicStaticVolatileIntMemberField;
//  private  final static       volatile int privateFinalStaticVolatileIntMemberField=0;
//       final static       volatile int finalStaticVolatileIntMemberField=0;
//  protected final static       volatile int protectedFinalStaticVolatileIntMemberField=0;
//  public  final static       volatile int publicFinalStaticVolatileIntMemberField=0;
  /*transient and not volatile*/
  private        transient      int privateTransientIntMemberField;
              transient      int transientIntMemberField;
  protected       transient      int protectedTransientIntMemberField;
  public         transient      int publicTransientIntMemberField;
  private  final    transient      int privateFinalTransientIntMemberField=0;
       final    transient      int finalTransientIntMemberField=0;
  protected final    transient      int protectedFinalTransientIntMemberField=0;
  public  final    transient      int publicFinalTransientIntMemberField=0;
  private     static transient      int privateStaticTransientIntMemberField;
          static transient      int staticTransientIntMemberField;
  protected    static transient      int protectedStaticTransientIntMemberField;
  public     static transient      int publicStaticTransientIntMemberField;
  private  final static transient      int privateFinalStaticTransientIntMemberField=0;
       final static transient      int finalStaticTransientIntMemberField=0;
  protected final static transient      int protectedFinalStaticTransientIntMemberField=0;
  public  final static transient      int publicFinalStaticTransientIntMemberField=0;
  /*not transient and not volatile*/
  private        int privateIntMemberField;
              int intMemberField;
  protected       int protectedIntMemberField;
  public         int publicIntMemberField;
  private  final    int privateFinalIntMemberField=0;
       final    int finalIntMemberField=0;
  protected final    int protectedFinalIntMemberField=0;
  public  final    int publicFinalIntMemberField=0;
  private     static int privateStaticIntMemberField;
          static int staticIntMemberField;
  protected    static int protectedStaticIntMemberField;
  public     static int publicStaticIntMemberField;
  private  final static int privateFinalStaticIntMemberField=0;
       final static int finalStaticIntMemberField=0;
  protected final static int protectedFinalStaticIntMemberField=0;
  public  final static int publicFinalStaticIntMemberField=0;
  /*constructors*/
  private  A(         ){}
       A(int i      ){}
  protected A(int i,int j   ){}
  public  A(int i,int j,int k){}
  /*methods*/
  private      final static synchronized native void privateFinalStaticSynchronizedNativeVoidMethod();
            final static synchronized native void    finalStaticSynchronizedNativeVoidMethod();
  protected     final static synchronized native void protectedFinalStaticSynchronizedNativeVoidMethod();
  public       final static synchronized native void publicFinalStaticSynchronizedNativeVoidMethod();
  private          static synchronized native void privateStaticSynchronizedNativeVoidMethod();
               static synchronized native void    staticSynchronizedNativeVoidMethod();
  protected         static synchronized native void protectedStaticSynchronizedNativeVoidMethod();
  public          static synchronized native void publicStaticSynchronizedNativeVoidMethod();
  private      final     synchronized native void privateFinalSynchronizedNativeVoidMethod();
            final     synchronized native void    finalSynchronizedNativeVoidMethod();
  protected     final     synchronized native void protectedFinalSynchronizedNativeVoidMethod();
  public       final     synchronized native void publicFinalSynchronizedNativeVoidMethod();
  private             synchronized native void privateSynchronizedNativeVoidMethod();
                   synchronized native void    synchronizedNativeVoidMethod();
  protected            synchronized native void protectedSynchronizedNativeVoidMethod();
  public              synchronized native void publicSynchronizedNativeVoidMethod();
  private      final static       native void privateFinalStaticNativeVoidMethod();
            final static       native void    finalStaticNativeVoidMethod();
  protected     final static       native void protectedFinalStaticNativeVoidMethod();
  public       final static       native void publicFinalStaticNativeVoidMethod();
  private          static       native void privateStaticNativeVoidMethod();
               static       native void    staticNativeVoidMethod();
  protected         static       native void protectedStaticNativeVoidMethod();
  public          static       native void publicStaticNativeVoidMethod();
  private      final           native void privateFinalNativeVoidMethod();
            final           native void    finalNativeVoidMethod();
  protected     final           native void protectedFinalNativeVoidMethod();
  public       final           native void publicFinalNativeVoidMethod();
  private                    native void privateNativeVoidMethod();
                         native void nativeVoidMethod();
  protected                   native void protectedNativeVoidMethod();
  public                    native void publicNativeVoidMethod();
  private      final static synchronized    void privateFinalStaticSynchronizedVoidMethod(){};
            final static synchronized    void    finalStaticSynchronizedVoidMethod(){};
  protected     final static synchronized    void protectedFinalStaticSynchronizedVoidMethod(){};
  public       final static synchronized    void publicFinalStaticSynchronizedVoidMethod(){};
  private          static synchronized    void privateStaticSynchronizedVoidMethod(){};
               static synchronized    void    staticSynchronizedVoidMethod(){};
  protected         static synchronized    void protectedStaticSynchronizedVoidMethod(){};
  public          static synchronized    void publicStaticSynchronizedVoidMethod(){};
  private      final     synchronized    void privateFinalSynchronizedVoidMethod(){};
            final     synchronized    void    finalSynchronizedVoidMethod(){};
  protected     final     synchronized    void protectedFinalSynchronizedVoidMethod(){};
  public       final     synchronized    void publicFinalSynchronizedVoidMethod(){};
  private             synchronized    void privateSynchronizedVoidMethod(){};
                   synchronized    void    synchronizedVoidMethod(){};
  protected            synchronized    void protectedSynchronizedVoidMethod(){};
  public              synchronized    void publicSynchronizedVoidMethod(){};
  private      final static           void privateFinalStaticVoidMethod(){};
            final static           void    finalStaticVoidMethod(){};
  protected     final static           void protectedFinalStaticVoidMethod(){};
  public       final static           void publicFinalStaticVoidMethod(){};
  private          static           void privateStaticVoidMethod(){};
               static           void    staticVoidMethod(){};
  protected         static           void protectedStaticVoidMethod(){};
  public          static           void publicStaticVoidMethod(){};
  private      final               void privateFinalVoidMethod(){};
            final               void    finalVoidMethod(){};
  protected     final               void protectedFinalVoidMethod(){};
  public       final               void publicFinalVoidMethod(){};
  private                       void privateVoidMethod(){};
                             void    voidMethod(){};
  protected                      void protectedVoidMethod(){};
  public                        void publicVoidMethod(){};
//  private  abstract final static synchronized native void privateAbstractFinalStaticSynchronizedNativeVoidMethod(){};
//       abstract final static synchronized native void    abstractFinalStaticSynchronizedNativeVoidMethod(){};
//  protected abstract final static synchronized native void protectedAbstractFinalStaticSynchronizedNativeVoidMethod(){};
//  public  abstract final static synchronized native void publicAbstractFinalStaticSynchronizedNativeVoidMethod(){};
//  private  abstract    static synchronized native void privateAbstractStaticSynchronizedNativeVoidMethod();
//       abstract    static synchronized native void    abstractStaticSynchronizedNativeVoidMethod();
//  protected abstract    static synchronized native void protectedAbstractStaticSynchronizedNativeVoidMethod();
//  public  abstract    static synchronized native void publicAbstractStaticSynchronizedNativeVoidMethod();
//  private  abstract final     synchronized native void privateAbstractFinalSynchronizedNativeVoidMethod(){};
//       abstract final     synchronized native void    abstractFinalSynchronizedNativeVoidMethod(){};
//  protected abstract final     synchronized native void protectedAbstractFinalSynchronizedNativeVoidMethod(){};
//  public  abstract final     synchronized native void publicAbstractFinalSynchronizedNativeVoidMethod(){};
//  private  abstract        synchronized native void privateAbstractSynchronizedNativeVoidMethod(){};
//       abstract        synchronized native void    abstractSynchronizedNativeVoidMethod(){};
//  protected abstract        synchronized native void protectedAbstractSynchronizedNativeVoidMethod(){};
//  public  abstract        synchronized native void publicAbstractSynchronizedNativeVoidMethod(){};
//  private  abstract final static       native void privateAbstractFinalStaticNativeVoidMethod(){};
//       abstract final static       native void    abstractFinalStaticNativeVoidMethod(){};
//  protected abstract final static       native void protectedAbstractFinalStaticNativeVoidMethod(){};
//  public  abstract final static       native void publicAbstractFinalStaticNativeVoidMethod(){};
//  private  abstract    static       native void privateAbstractStaticNativeVoidMethod(){};
//       abstract    static       native void    abstractStaticNativeVoidMethod(){};
//  protected abstract    static       native void protectedAbstractStaticNativeVoidMethod(){};
//  public  abstract    static       native void publicAbstractStaticNativeVoidMethod(){};
//  private  abstract final           native void privateAbstractFinalNativeVoidMethod(){};
//       abstract final           native void    abstractFinalNativeVoidMethod(){};
//  protected abstract final           native void protectedAbstractFinalNativeVoidMethod(){};
//  public  abstract final           native void publicAbstractFinalNativeVoidMethod(){};
//  private  abstract              native void privateAbstractNativeVoidMethod();
//       abstract              native void    abstractNativeVoidMethod();
//  protected abstract              native void protectedAbstractNativeVoidMethod();
//  public  abstract              native void publicAbstractNativeVoidMethod();
//  private  abstract final static synchronized    void privateAbstractFinalStaticSynchronizedVoidMethod();
//       abstract final static synchronized    void    abstractFinalStaticSynchronizedVoidMethod();
//  protected abstract final static synchronized    void protectedAbstractFinalStaticSynchronizedVoidMethod();
//  public  abstract final static synchronized    void publicAbstractFinalStaticSynchronizedVoidMethod();
//  private  abstract    static synchronized    void privateAbstractStaticSynchronizedVoidMethod();
//       abstract    static synchronized    void    abstractStaticSynchronizedVoidMethod();
//  protected abstract    static synchronized    void protectedAbstractStaticSynchronizedVoidMethod();
//  public  abstract    static synchronized    void publicAbstractStaticSynchronizedVoidMethod();
//  private  abstract final     synchronized    void privateAbstractFinalSynchronizedVoidMethod(){};
//       abstract final     synchronized    void    abstractFinalSynchronizedVoidMethod(){};
//  protected abstract final     synchronized    void protectedAbstractFinalSynchronizedVoidMethod(){};
//  public  abstract final     synchronized    void publicAbstractFinalSynchronizedVoidMethod(){};
//  private  abstract        synchronized    void privateAbstractSynchronizedVoidMethod();
//       abstract        synchronized    void    abstractSynchronizedVoidMethod();
//  protected abstract        synchronized    void protectedAbstractSynchronizedVoidMethod();
//  public  abstract        synchronized    void publicAbstractSynchronizedVoidMethod();
//  private  abstract final static           void privateAbstractFinalStaticVoidMethod;
//       abstract final static           void    abstractFinalStaticVoidMethod;
//  protected abstract final static           void protectedAbstractFinalStaticVoidMethod;
//  public  abstract final static           void publicAbstractFinalStaticVoidMethod;
//  private  abstract    static           void privateAbstractStaticVoidMethod();
//       abstract    static           void    abstractStaticVoidMethod();
//  protected abstract    static           void protectedAbstractStaticVoidMethod();
//  public  abstract    static           void publicAbstractStaticVoidMethod();
//  private  abstract final               void privateAbstractFinalVoidMethod();
//       abstract final               void    abstractFinalVoidMethod();
//  protected abstract final               void protectedAbstractFinalVoidMethod();
//  public  abstract final               void publicAbstractFinalVoidMethod();
//  private  abstract                  void privateAbstractVoidMethod();
       abstract                  void    abstractVoidMethod();
  protected abstract                  void protectedAbstractVoidMethod();
  public  abstract                  void publicAbstractVoidMethod();
}

ps：Java 修饰符

Java语言提供了很多修饰符，主要分为以下两类：

  • 访问修饰符

  • 非访问修饰符

修饰符用来定义类、方法或者变量，通常放在语句的最前端。我们通过下面的例子来说明：

public class className {
  // ...
}
private boolean myFlag;
static final double weeks = 9.5;
protected static final int BOXWIDTH = 42;
public static void main(String[] arguments) {
  // 方法体
}

访问控制修饰符

Java中，可以使用访问控制符来保护对类、变量、方法和构造方法的访问。Java 支持 4 种不同的访问权限。

  • default (即缺省，什么也不写）: 在同一包内可见，不使用任何修饰符。使用对象：类、接口、变量、方法。

  • private : 在同一类内可见。使用对象：变量、方法。 注意：不能修饰类（外部类）

  • public : 对所有类可见。使用对象：类、接口、变量、方法

  • protected : 对同一包内的类和所有子类可见。使用对象：变量、方法。 注意：不能修饰类（外部类）。

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