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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