integer.html

API資料大全

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<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - an integer<DT><B>Returns:</B><DD>the string representation of the unsigned integer value
          represented by the argument in octal (base&nbsp;8).<DT><B>Since: </B><DD>JDK1.0.2</DD>
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<A NAME="toBinaryString(int)"><!-- --></A><H3>
toBinaryString</H3>
<PRE>
public static <A HREF="../../java/lang/String.html">String</A> <B>toBinaryString</B>(int&nbsp;i)</PRE>
<DL>
<DD>Creates a string representation of the integer argument as an
 unsigned integer in base&nbsp;2.
 <p>
 The unsigned integer value is the argument plus 2<sup>32</sup>if 
 the argument is negative; otherwise it is equal to the argument. 
 This value is converted to a string of ASCII digits in binary 
 (base&nbsp;2) with no extra leading <code>0</code>s. 
 
 If the unsigned magnitude is zero, it is represented by a single 
 zero character <tt>'0'</tt> (<tt>'&#92;u0030'</tt>); otherwise, the 
 first character of the representation of the unsigned magnitude 
 will not be the zero character. The characters <tt>'0'</tt> 
 (<tt>'&#92;u0030'</tt>) and <tt>'1'</tt> (<tt>'&#92;u0031'</tt>) are used 
 as binary digits.<DD><DL>
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</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - an integer.<DT><B>Returns:</B><DD>the string representation of the unsigned integer value
          represented by the argument in binary (base&nbsp;2).<DT><B>Since: </B><DD>JDK1.0.2</DD>
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<A NAME="toString(int)"><!-- --></A><H3>
toString</H3>
<PRE>
public static <A HREF="../../java/lang/String.html">String</A> <B>toString</B>(int&nbsp;i)</PRE>
<DL>
<DD>Returns a new String object representing the specified integer. The 
 argument is converted to signed decimal representation and returned 
 as a string, exactly as if the argument and radix <tt>10</tt> were 
 given as arguments to the <A HREF="../../java/lang/Integer.html#toString(int, int)"><CODE>toString(int, int)</CODE></A> method.<DD><DL>
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</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - an integer to be converted.<DT><B>Returns:</B><DD>a string representation of the argument in base&nbsp;10.</DL>
</DD>
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<A NAME="parseInt(java.lang.String, int)"><!-- --></A><H3>
parseInt</H3>
<PRE>
public static int <B>parseInt</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;s,
                           int&nbsp;radix)
                    throws <A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></PRE>
<DL>
<DD>Parses the string argument as a signed integer in the radix 
 specified by the second argument. The characters in the string 
 must all be digits of the specified radix (as determined by 
 whether <A HREF="../../java/lang/Character.html#digit(char, int)"><CODE>Character.digit(char, int)</CODE></A> returns a 
 nonnegative value), except that the first character may be an 
 ASCII minus sign <code>'-'</code> (<code>'&#92;u002d'</code>) to 
 indicate a negative value. The resulting integer value is returned. 
 <p>
 An exception of type <tt>NumberFormatException</tt> is thrown if any 
 of the following situations occurs:
 <ul>
 <li>The first argument is <tt>null</tt> or is a string of length zero. 
 <li>The radix is either smaller than 
 <A HREF="../../java/lang/Character.html#MIN_RADIX"><CODE>Character.MIN_RADIX</CODE></A> or
 larger than <A HREF="../../java/lang/Character.html#MAX_RADIX"><CODE>Character.MAX_RADIX</CODE></A>. 
 <li>Any character of the string is not a digit of the specified radix,
 except that the first character may be a minus sign <tt>'-'</tt> 
 (<tt>'&#92;u002d'</tt>) provided that the string is longer than length 1. 
 <li>The integer value represented by the string is not a value of type
 <tt>int</tt>. 
 </ul><p>
 Examples:
 <blockquote><pre>
 parseInt("0", 10) returns 0
 parseInt("473", 10) returns 473
 parseInt("-0", 10) returns 0
 parseInt("-FF", 16) returns -255
 parseInt("1100110", 2) returns 102
 parseInt("2147483647", 10) returns 2147483647
 parseInt("-2147483648", 10) returns -2147483648
 parseInt("2147483648", 10) throws a NumberFormatException
 parseInt("99", 8) throws a NumberFormatException
 parseInt("Kona", 10) throws a NumberFormatException
 parseInt("Kona", 27) returns 411787
 </pre></blockquote><DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the <code>String</code> containing the integer.<DD><CODE>radix</CODE> - the radix to be used.<DT><B>Returns:</B><DD>the integer represented by the string argument in the
             specified radix.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></CODE> - if the string does not contain a
               parsable integer.</DL>
</DD>
</DL>
<HR>

<A NAME="parseInt(java.lang.String)"><!-- --></A><H3>
parseInt</H3>
<PRE>
public static int <B>parseInt</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;s)
                    throws <A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></PRE>
<DL>
<DD>Parses the string argument as a signed decimal integer. The 
 characters in the string must all be decimal digits, except that 
 the first character may be an ASCII minus sign <code>'-'</code> 
 (<tt>'&#92;u002d'</tt>) to indicate a negative value. The resulting 
 integer value is returned, exactly as if the argument and the radix 
 10 were given as arguments to the 
 <A HREF="../../java/lang/Integer.html#parseInt(java.lang.String, int)"><CODE>parseInt(java.lang.String, int)</CODE></A> method.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - a string.<DT><B>Returns:</B><DD>the integer represented by the argument in decimal.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></CODE> - if the string does not contain a
               parsable integer.</DL>
</DD>
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<A NAME="valueOf(java.lang.String, int)"><!-- --></A><H3>
valueOf</H3>
<PRE>
public static <A HREF="../../java/lang/Integer.html">Integer</A> <B>valueOf</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;s,
                              int&nbsp;radix)
                       throws <A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></PRE>
<DL>
<DD>Returns a new Integer object initialized to the value of the
 specified String. The first argument is interpreted as representing 
 a signed integer in the radix specified by the second argument, 
 exactly as if the arguments were given to the 
 <A HREF="../../java/lang/Integer.html#parseInt(java.lang.String, int)"><CODE>parseInt(java.lang.String, int)</CODE></A> method. The result is an 
 <code>Integer</code> object that represents the integer value 
 specified by the string. 
 <p>
 In other words, this method returns an <code>Integer</code> object 
 equal to the value of:
 <blockquote><pre>
 new Integer(Integer.parseInt(s, radix))  
 </pre></blockquote><DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the string to be parsed.<DD><CODE>radix</CODE> - the radix of the integer represented by string 
             <tt>s</tt><DT><B>Returns:</B><DD>a newly constructed <code>Integer</code> initialized to the
             value represented by the string argument in the specified
             radix.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></CODE> - if the String cannot be 
             parsed as an <code>int</code>.</DL>
</DD>
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<A NAME="valueOf(java.lang.String)"><!-- --></A><H3>
valueOf</H3>
<PRE>
public static <A HREF="../../java/lang/Integer.html">Integer</A> <B>valueOf</B>(<A HREF="../../java/lang/String.html">String</A>&nbsp;s)
                       throws <A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></PRE>
<DL>
<DD>Returns a new Integer object initialized to the value of the
 specified String. The argument is interpreted as representing a 
 signed decimal integer, exactly as if the argument were given to 
 the <A HREF="../../java/lang/Integer.html#parseInt(java.lang.String)"><CODE>parseInt(java.lang.String)</CODE></A> method. The result is an 
 <tt>Integer</tt> object that represents the integer value specified 
 by the string. 
 <p>
 In other words, this method returns an <tt>Integer</tt> object equal 
 to the value of:
 <blockquote><pre>
 new Integer(Integer.parseInt(s)) 
 </pre></blockquote><DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the string to be parsed.<DT><B>Returns:</B><DD>a newly constructed <code>Integer</code> initialized to the
             value represented by the string argument.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/lang/NumberFormatException.html">NumberFormatException</A></CODE> - if the string cannot be parsed 
             as an integer.</DL>
</DD>
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<HR>

<A NAME="byteValue()"><!-- --></A><H3>
byteValue</H3>
<PRE>
public byte <B>byteValue</B>()</PRE>
<DL>
<DD>Returns the value of this Integer as a byte.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Number.html#byteValue()">byteValue</A></CODE> in class <CODE><A HREF="../../java/lang/Number.html">Number</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Since: </B><DD>JDK1.1</DD>
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</DD>
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<A NAME="shortValue()"><!-- --></A><H3>
shortValue</H3>
<PRE>
public short <B>shortValue</B>()</PRE>
<DL>
<DD>Returns the value of this Integer as a short.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Number.html#shortValue()">shortValue</A></CODE> in class <CODE><A HREF="../../java/lang/Number.html">Number</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Since: </B><DD>JDK1.1</DD>
</DL>
</DD>
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<HR>

<A NAME="intValue()"><!-- --></A><H3>
intValue</H3>
<PRE>
public int <B>intValue</B>()</PRE>
<DL>
<DD>Returns the value of this Integer as an int.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Number.html#intValue()">intValue</A></CODE> in class <CODE><A HREF="../../java/lang/Number.html">Number</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the <code>int</code> value represented by this object.</DL>
</DD>
</DL>
<HR>

<A NAME="longValue()"><!-- --></A><H3>
longValue</H3>
<PRE>
public long <B>longValue</B>()</PRE>
<DL>
<DD>Returns the value of this Integer as a <tt>long</tt>.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Number.html#longValue()">longValue</A></CODE> in class <CODE><A HREF="../../java/lang/Number.html">Number</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the <code>int</code> value represented by this object that is
          converted to type <code>long</code> and the result of the
          conversion is returned.</DL>
</DD>
</DL>
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<A NAME="floatValue()"><!-- --></A><H3>
floatValue</H3>
<PRE>
public float <B>floatValue</B>()</PRE>
<DL>
<DD>Returns the value of this Integer as a <tt>float</tt>.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Number.html#floatValue()">floatValue</A></CODE> in class <CODE><A HREF="../../java/lang/Number.html">Number</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the <code>int</code> value represented by this object is
          converted to type <code>float</code> and the result of the
          conversion is returned.</DL>
</DD>
</DL>
<HR>

<A NAME="doubleValue()"><!-- --></A><H3>
doubleValue</H3>
<PRE>
public double <B>doubleValue</B>()</PRE>
<DL>
<DD>Returns the value of this Integer as a <tt>double</tt>.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Number.html#doubleValue()">doubleValue</A></CODE> in class <CODE><A HREF="../../java/lang/Number.html">Number</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the <code>int</code> value represented by this object is
          converted to type <code>double</code> and the result of the
          conversion is returned.</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>