integer.html

API資料大全

<DL>
<DD>Returns a String object representing this Integer's value. The 
 value is converted to signed decimal representation and returned 
 as a string, exactly as if the integer value were given as an 
 argument to the <A HREF="../../java/lang/Integer.html#toString(int)"><CODE>toString(int)</CODE></A> method.<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><DL>
<DT><B>Returns:</B><DD>a string representation of the value of this object in
          base&nbsp;10.</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 Integer.<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><DL>
<DT><B>Returns:</B><DD>a hash code value for this object, equal to the 
          primitive <tt>int</tt> value represented by this 
          <tt>Integer</tt> object.</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 object to the specified object.
 The result is <code>true</code> if and only if the argument is not
 <code>null</code> and is an <code>Integer</code> object that contains
 the same <code>int</code> value as this object.<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><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - the object to compare with.<DT><B>Returns:</B><DD><code>true</code> if the objects are the same;
          <code>false</code> otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="getInteger(java.lang.String)"><!-- --></A><H3>
getInteger</H3>
<PRE>
public static <A HREF="../../java/lang/Integer.html">Integer</A> <B>getInteger</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;nm)</PRE>
<DL>
<DD>Determines the integer value of the system property with the
 specified name.
 <p>
 The first argument is treated as the name of a system property. 
 System properties are accessible through the 
 <A HREF="../../java/lang/System.html#getProperty(java.lang.String)"><CODE>System.getProperty(java.lang.String)</CODE></A> method. The 
 string value of this property is then interpreted as an integer 
 value and an <code>Integer</code> object representing this value is 
 returned. Details of possible numeric formats can be found with 
 the definition of <code>getProperty</code>. 
 <p>
 If there is no property with the specified name, if the specified name
 is empty or null, or if the property does not have the correct numeric
 format, then <code>null</code> is returned. In other words, this method
 returns an <code>Integer</code> object equal to the value of:
 <blockquote><pre>
 getInteger(nm, null)
 </pre></blockquote><DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nm</CODE> - property name.<DT><B>Returns:</B><DD>the <code>Integer</code> value of the property.<DT><B>See Also: </B><DD><A HREF="../../java/lang/System.html#getProperty(java.lang.String)"><CODE>System.getProperty(java.lang.String)</CODE></A>, 
<A HREF="../../java/lang/System.html#getProperty(java.lang.String, java.lang.String)"><CODE>System.getProperty(java.lang.String, java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getInteger(java.lang.String, int)"><!-- --></A><H3>
getInteger</H3>
<PRE>
public static <A HREF="../../java/lang/Integer.html">Integer</A> <B>getInteger</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;nm,
                                 int&nbsp;val)</PRE>
<DL>
<DD>Determines the integer value of the system property with the
 specified name.
 <p>
 The first argument is treated as the name of a system property. 
 System properties are accessible through <code>getProperty</code>, 
 a method defined by the <code>System</code> class. The 
 string value of this property is then interpreted as an integer 
 value and an <code>Integer</code> object representing this value is 
 returned. Details of possible numeric formats can be found with 
 the definition of <code>getProperty</code>. 
 <p>
 The second argument is the default value. An <code>Integer</code> object
 that represents the value of the second argument is returned if there
 is no property of the specified name, if the property does not have
 the correct numeric format, or if the specified name is empty or null.
 <p>
 In other words, this method returns an <code>Integer</code> object 
 equal to the value of:
 <blockquote><pre>
 getInteger(nm, new Integer(val))
 </pre></blockquote>
 but in practice it may be implemented in a manner such as: 
 <blockquote><pre>
 Integer result = getInteger(nm, null);
 return (result == null) ? new Integer(val) : result;
 </pre></blockquote>
 to avoid the unnecessary allocation of an <code>Integer</code> 
 object when the default value is not needed.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nm</CODE> - property name.<DD><CODE>val</CODE> - default value.<DT><B>Returns:</B><DD>the <code>Integer</code> value of the property.<DT><B>See Also: </B><DD><A HREF="../../java/lang/System.html#getProperty(java.lang.String)"><CODE>System.getProperty(java.lang.String)</CODE></A>, 
<A HREF="../../java/lang/System.html#getProperty(java.lang.String, java.lang.String)"><CODE>System.getProperty(java.lang.String, java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getInteger(java.lang.String, java.lang.Integer)"><!-- --></A><H3>
getInteger</H3>
<PRE>
public static <A HREF="../../java/lang/Integer.html">Integer</A> <B>getInteger</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;nm,
                                 <A HREF="../../java/lang/Integer.html">Integer</A>&nbsp;val)</PRE>
<DL>
<DD>Returns the integer value of the system property with the specified
 name.  The first argument is treated as the name of a system property.
 System properties are accessible through <code>getProperty</code>, 
 a method defined by the <code>System</code> class. The string value of
 this property is then interpreted as an integer value, as per the
 <code>Integer.decode</code> method, and an <code>Integer</code> object
 representing this value is returned.
 <p>
 <ul><li>If the property value begins with the two ASCII characters 
         <code>0x</code> or the ASCII character <code>#</code>, not 
      followed by a minus sign, then the rest of it is parsed as a 
      hexadecimal integer exactly as for the method 
      <A HREF="../../java/lang/Integer.html#valueOf(java.lang.String, int)"><CODE>valueOf(java.lang.String, int)</CODE></A> with radix 16. 
 <li>If the property value begins with the ASCII character 
     <code>0</code> followed by another character, it is parsed as an 
     octal integer exactly as for the method 
     <A HREF="../../java/lang/Integer.html#valueOf(java.lang.String, int)"><CODE>with radix 8. 
 <li>Otherwise, the property value is parsed as a decimal integer 
 exactly as for the method {@link #valueOf(java.lang.String, int)</CODE></A> 
 with radix 10. 
 </ul><p>
 The second argument is the default value. The default value is
 returned if there is no property of the specified name, if the
 property does not have the correct numeric format, or if the
 specified name is empty or null.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nm</CODE> - property name.<DD><CODE>val</CODE> - default value.<DT><B>Returns:</B><DD>the <code>Integer</code> value of the property.<DT><B>See Also: </B><DD><A HREF="../../java/lang/System.html#getProperty(java.lang.String)"><CODE>System.getProperty(java.lang.String)</CODE></A>, 
<A HREF="../../java/lang/System.html#getProperty(java.lang.String, java.lang.String)"><CODE>System.getProperty(java.lang.String, java.lang.String)</CODE></A>, 
<A HREF="../../java/lang/Integer.html#decode(java.lang.String)"><CODE>decode(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="decode(java.lang.String)"><!-- --></A><H3>
decode</H3>
<PRE>
public static <A HREF="../../java/lang/Integer.html">Integer</A> <B>decode</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;nm)
                      throws <A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></PRE>
<DL>
<DD>Decodes a <code>String</code> into an <code>Integer</code>.  Accepts
 decimal, hexadecimal, and octal numbers, in the following formats:
 <pre>
     [-]        decimal constant
     [-] 0x     hex constant
     [-] #      hex constant
     [-] 0      octal constant
 </pre>

 The constant following an (optional) negative sign and/or "radix
 specifier" is parsed as by the <code>Integer.parseInt</code> method
 with the specified radix (10, 8 or 16).  This constant must be positive
 or a NumberFormatException will result.  The result is made negative if
 first character of the specified <code>String</code> is the negative
 sign.  No whitespace characters are permitted in the
 <code>String</code>.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nm</CODE> - the <code>String</code> to decode.<DT><B>Returns:</B><DD>the <code>Integer</code> represented by the specified string.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></CODE> - if the <code>String</code> does not
            contain a parsable integer.<DT><B>See Also: </B><DD><A HREF="../../java/lang/Integer.html#parseInt(java.lang.String, int)"><CODE>parseInt(String, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="compareTo(java.lang.Integer)"><!-- --></A><H3>
compareTo</H3>
<PRE>
public int <B>compareTo</B>(<A HREF="../../java/lang/Integer.html">Integer</A>&nbsp;anotherInteger)</PRE>
<DL>
<DD>Compares two Integers numerically.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>anotherInteger</CODE> - the <code>Integer</code> to be compared.<DT><B>Returns:</B><DD>the value <code>0</code> if the argument Integer is equal to
          this Integer; a value less than <code>0</code> if this Integer
          is numerically less than the Integer argument; and a
          value greater than <code>0</code> if this Integer is
          numerically greater than the Integer argument
		(signed comparison).<DT><B>Since: </B><DD>1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="compareTo(java.lang.Object)"><!-- --></A><H3>
compareTo</H3>
<PRE>
public int <B>compareTo</B>(<A HREF="../../java/lang/Object.html">Object</A>&nbsp;o)</PRE>
<DL>
<DD>Compares this Integer to another Object.  If the Object is a Integer,
 this function behaves like <code>compareTo(Integer)</code>.  Otherwise,
 it throws a <code>ClassCastException</code> (as Integers are comparable
 only to other Integers).<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../java/lang/Comparable.html#compareTo(java.lang.Object)">compareTo</A></CODE> in interface <CODE><A HREF="../../java/lang/Comparable.html">Comparable</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>o</CODE> - the <code>Object</code> to be compared.<DT><B>Returns:</B><DD>the value <code>0</code> if the argument is a Integer
		numerically equal to this Integer; a value less than
		<code>0</code> if the argument is a Integer numerically
		greater than this Integer; and a value greater than
		<code>0</code> if the argument is a Integer numerically
		less than this Integer.<DT><B>Throws:</B><DD><CODE><code>ClassCastException</code></CODE> - if the argument is not an
		  <code>Integer</code>.<DT><B>Since: </B><DD>1.2</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/lang/Comparable.html"><CODE>Comparable</CODE></A></DL>
</DD>
</DL>
<!-- ========= END OF CLASS DATA ========= -->
<HR>

<!-- ========== START OF NAVBAR ========== -->
<A NAME="navbar_bottom"><!-- --></A>
<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0">
<TR>
<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
<A NAME="navbar_bottom_firstrow"><!-- --></A>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3">
  <TR ALIGN="center" VALIGN="top">
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Integer.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
  </TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
<b>Java<sup><font size=-2>TM</font></sup>&nbsp;2&nbsp;Platform<br>Std.&nbsp;Ed. v1.3</b></EM>
</TD>
</TR>

<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
&nbsp;<A HREF="../../java/lang/InheritableThreadLocal.html"><B>PREV CLASS</B></A>&nbsp;
&nbsp;<A HREF="../../java/lang/Long.html"><B>NEXT CLASS</B></A></FONT></TD>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
  <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A>  &nbsp;
&nbsp;<A HREF="Integer.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
  SUMMARY: &nbsp;INNER&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL: &nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<!-- =========== END OF NAVBAR =========== -->

<HR>
<font size="-1"><a href="http://java.sun.com/cgi-bin/bugreport.cgi">Submit a bug or feature</a><br>For further API reference and developer documentation, see <a href="http://java.sun.com/products/jdk/1.3/devdocs-vs-specs.html">Java 2 SDK SE Developer Documentation</a>. That documentation  contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. <p>Java, Java 2D, and JDBC are trademarks or registered trademarks of Sun Microsystems, Inc. in the US and other countries.<br>Copyright 1993-2000 Sun Microsystems, Inc. 901 San Antonio Road<br>Palo Alto, California, 94303, U.S.A.  All Rights Reserved.</font>
</BODY>
</HTML>