method.html

API資料大全

<DD>Returns the name of the method represented by this <code>Method</code> 
 object, as a <code>String</code>.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../../java/lang/reflect/Member.html#getName()">getName</A></CODE> in interface <CODE><A HREF="../../../java/lang/reflect/Member.html">Member</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="getModifiers()"><!-- --></A><H3>
getModifiers</H3>
<PRE>
public int <B>getModifiers</B>()</PRE>
<DL>
<DD>Returns the Java language modifiers for the method represented
 by this <code>Method</code> object, as an integer. The <code>Modifier</code> class should
 be used to decode the modifiers.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../../java/lang/reflect/Member.html#getModifiers()">getModifiers</A></CODE> in interface <CODE><A HREF="../../../java/lang/reflect/Member.html">Member</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>See Also: </B><DD><A HREF="../../../java/lang/reflect/Modifier.html"><CODE>Modifier</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getReturnType()"><!-- --></A><H3>
getReturnType</H3>
<PRE>
public <A HREF="../../../java/lang/Class.html">Class</A> <B>getReturnType</B>()</PRE>
<DL>
<DD>Returns a <code>Class</code> object that represents the formal return type
 of the method represented by this <code>Method</code> object.<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getParameterTypes()"><!-- --></A><H3>
getParameterTypes</H3>
<PRE>
public <A HREF="../../../java/lang/Class.html">Class</A>[] <B>getParameterTypes</B>()</PRE>
<DL>
<DD>Returns an array of <code>Class</code> objects that represent the formal
 parameter types, in declaration order, of the method
 represented by this <code>Method</code> object.  Returns an array of length
 0 if the underlying method takes no parameters.<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getExceptionTypes()"><!-- --></A><H3>
getExceptionTypes</H3>
<PRE>
public <A HREF="../../../java/lang/Class.html">Class</A>[] <B>getExceptionTypes</B>()</PRE>
<DL>
<DD>Returns an array of <code>Class</code> objects that represent 
 the types of the exceptions declared to be thrown
 by the underlying method
 represented by this <code>Method</code> object.  Returns an array of length
 0 if the method declares no exceptions in its <code>throws</code> clause.<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="../../../java/lang/Object.html">Object</A>&nbsp;obj)</PRE>
<DL>
<DD>Compares this <code>Method</code> against the specified object.  Returns
 true if the objects are the same.  Two <code>Methods</code> are the same if
 they were declared by the same class and have the same name
 and formal parameter types and return type.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../java/lang/Object.html#equals(java.lang.Object)">equals</A></CODE> in class <CODE><A HREF="../../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD>Following copied from class: <CODE>java.lang.Object</CODE></DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the reference object with which to compare.<DT><B>Returns:</B><DD><code>true</code> if this object is the same as the obj
          argument; <code>false</code> otherwise.<DT><B>See Also: </B><DD><A HREF="../../../java/lang/Boolean.html#hashCode()"><CODE>Boolean.hashCode()</CODE></A>, 
<A HREF="../../../java/util/Hashtable.html"><CODE>Hashtable</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hashcode for this <code>Method</code>.  The hashcode is computed
 as the exclusive-or of the hashcodes for the underlying
 method's declaring class name and the method's name.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../java/lang/Object.html#hashCode()">hashCode</A></CODE> in class <CODE><A HREF="../../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD>Following copied from class: <CODE>java.lang.Object</CODE></DD>
<DD><DL>
<DT><B>Returns:</B><DD>a hash code value for this object.<DT><B>See Also: </B><DD><A HREF="../../../java/lang/Object.html#equals(java.lang.Object)"><CODE>Object.equals(java.lang.Object)</CODE></A>, 
<A HREF="../../../java/util/Hashtable.html"><CODE>Hashtable</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="../../../java/lang/String.html">String</A> <B>toString</B>()</PRE>
<DL>
<DD>Returns a string describing this <code>Method</code>.  The string is
 formatted as the method access modifiers, if any, followed by
 the method return type, followed by a space, followed by the
 class declaring the method, followed by a period, followed by
 the method name, followed by a parenthesized, comma-separated
 list of the method's formal parameter types. If the method
 throws checked exceptions, the parameter list is followed by a
 space, followed by the word throws followed by a
 comma-separated list of the thrown exception types.
 For example:
 <pre>
    public boolean java.lang.Object.equals(java.lang.Object)
 </pre>

 <p>The access modifiers are placed in canonical order as
 specified by "The Java Language Specification".  This is
 <tt>public</tt>, <tt>protected</tt> or <tt>private</tt> first,
 and then other modifiers in the following order:
 <tt>abstract</tt>, <tt>static</tt>, <tt>final</tt>,
 <tt>synchronized</tt> <tt>native</tt>.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../java/lang/Object.html#toString()">toString</A></CODE> in class <CODE><A HREF="../../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD>Following copied from class: <CODE>java.lang.Object</CODE></DD>
<DD><DL>
<DT><B>Returns:</B><DD>a string representation of the object.</DL>
</DD>
</DL>
<HR>

<A NAME="invoke(java.lang.Object, java.lang.Object[])"><!-- --></A><H3>
invoke</H3>
<PRE>
public <A HREF="../../../java/lang/Object.html">Object</A> <B>invoke</B>(<A HREF="../../../java/lang/Object.html">Object</A>&nbsp;obj,
                     <A HREF="../../../java/lang/Object.html">Object</A>[]&nbsp;args)
              throws <A HREF="../../../java/lang/IllegalAccessException.html">IllegalAccessException</A>,
                     <A HREF="../../../java/lang/IllegalArgumentException.html">IllegalArgumentException</A>,
                     <A HREF="../../../java/lang/reflect/InvocationTargetException.html">InvocationTargetException</A></PRE>
<DL>
<DD>Invokes the underlying method represented by this <code>Method</code> 
 object, on the specified object with the specified parameters.
 Individual parameters are automatically unwrapped to match
 primitive formal parameters, and both primitive and reference
 parameters are subject to widening conversions as
 necessary. The value returned by the underlying method is
 automatically wrapped in an object if it has a primitive type.

 <p>Method invocation proceeds with the following steps, in order:

 <p>If the underlying method is static, then the specified <code>obj</code> 
 argument is ignored. It may be null.

 <p>Otherwise, the method is an instance method.  If the specified
 object argument is null, the invocation throws a
 <code>NullPointerException</code>.  Otherwise, if the specified object
 argument is not an instance of the class or interface declaring
 the underlying method (or of a subclass or implementor
 thereof) the invocation throws an
 <code>IllegalArgumentException</code>.

 <p>If this <code>Method</code> object enforces Java language access control and
 the underlying method is inaccessible, the invocation throws an
 <code>IllegalAccessException</code>.

 <p>If the number of actual parameters supplied via <code>args</code> is
 different from the number of formal parameters required by the
 underlying method, the invocation throws an
 <code>IllegalArgumentException</code>.

 <p>For each actual parameter in the supplied <code>args</code> array:

 <p>If the corresponding formal parameter has a primitive type, an
 unwrapping conversion is attempted to convert the object value
 to a value of a primitive type.  If this attempt fails, the
 invocation throws an <code>IllegalArgumentException</code>.

 <p>If, after possible unwrapping, the parameter value cannot be
 converted to the corresponding formal parameter type by a
 method invocation conversion, the invocation throws an
 <code>IllegalArgumentException</code>.

 <p>If the underlying method is an instance method, it is invoked
 using dynamic method lookup as documented in The Java Language
 Specification, section 15.11.4.4; in particular, overriding
 based on the runtime type of the target object will occur.

 <p>If the underlying method is static, the class that declared
 the method is initialized if it has not already been initialized.
 The underlying method is invoked directly.

 <p>Control transfers to the invoked method.  If the method
 completes abruptly by throwing an exception, the exception is
 placed in an <code>InvocationTargetException</code> and thrown in turn to
 the caller of invoke.

 <p>If the method completes normally, the value it returns is
 returned to the caller of invoke; if the value has a primitive
 type, it is first appropriately wrapped in an object. If the
 underlying method return type is void, the invocation returns
 null.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B><DD><CODE><A HREF="../../../java/lang/IllegalAccessException.html">IllegalAccessException</A></CODE> - if the underlying method
              is inaccessible.<DD><CODE><A HREF="../../../java/lang/IllegalArgumentException.html">IllegalArgumentException</A></CODE> - if the number of actual and formal
              parameters differ, or if an unwrapping conversion fails.<DD><CODE><A HREF="../../../java/lang/reflect/InvocationTargetException.html">InvocationTargetException</A></CODE> - if the underlying method
              throws an exception.<DD><CODE><A HREF="../../../java/lang/NullPointerException.html">NullPointerException</A></CODE> - if the specified object is null
             and the method is an instance method.<DD><CODE><A HREF="../../../java/lang/ExceptionInInitializerError.html">ExceptionInInitializerError</A></CODE> - if the initialization
             provoked by this method fails.</DL>
</DD>
</DL>
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