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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:10 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class String</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_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> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/String.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/lang/StrictMath.html"><B>PREV CLASS</B></A> <A HREF="../../java/lang/StringBuffer.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> <A HREF="String.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.lang</FONT><BR>Class String</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.lang.String</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../java/lang/Comparable.html">Comparable</A>, <A HREF="../../java/io/Serializable.html">Serializable</A></DD></DL><HR><DL><DT>public final class <B>String</B><DT>extends <A HREF="../../java/lang/Object.html">Object</A><DT>implements <A HREF="../../java/io/Serializable.html">Serializable</A>, <A HREF="../../java/lang/Comparable.html">Comparable</A></DL><P>The <code>String</code> class represents character strings. All string literals in Java programs, such as <code>"abc"</code>, are implemented as instances of this class. <p> Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example: <p><blockquote><pre> String str = "abc"; </pre></blockquote><p> is equivalent to: <p><blockquote><pre> char data[] = {'a', 'b', 'c'}; String str = new String(data); </pre></blockquote><p> Here are some more examples of how strings can be used: <p><blockquote><pre> System.out.println("abc"); String cde = "cde"; System.out.println("abc" + cde); String c = "abc".substring(2,3); String d = cde.substring(1, 2); </pre></blockquote> <p> The class <code>String</code> includes methods for examining individual characters of the sequence, for comparing strings, for searching strings, for extracting substrings, and for creating a copy of a string with all characters translated to uppercase or to lowercase. <p> The Java language provides special support for the string concatentation operator ( + ), and for conversion of other objects to strings. String concatenation is implemented through the <code>StringBuffer</code> class and its <code>append</code> method. String conversions are implemented through the method <code>toString</code>, defined by <code>Object</code> and inherited by all classes in Java. For additional information on string concatenation and conversion, see Gosling, Joy, and Steele, <i>The Java Language Specification</i>.<P><DL><DT><B>Since: </B><DD>JDK1.0</DD><DT><B>See Also: </B><DD><A HREF="../../java/lang/Object.html#toString()"><CODE>Object.toString()</CODE></A>, <A HREF="../../java/lang/StringBuffer.html"><CODE>StringBuffer</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(boolean)"><CODE>StringBuffer.append(boolean)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(char)"><CODE>StringBuffer.append(char)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(char[])"><CODE>StringBuffer.append(char[])</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(char[], int, int)"><CODE>StringBuffer.append(char[], int, int)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(double)"><CODE>StringBuffer.append(double)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(float)"><CODE>StringBuffer.append(float)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(int)"><CODE>StringBuffer.append(int)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(long)"><CODE>StringBuffer.append(long)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(java.lang.Object)"><CODE>StringBuffer.append(java.lang.Object)</CODE></A>, <A HREF="../../java/lang/StringBuffer.html#append(java.lang.String)"><CODE>StringBuffer.append(java.lang.String)</CODE></A>, <a href="package-summary.html#charenc">Character encodings</a>, <A HREF="../../serialized-form.html#java.lang.String">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../java/util/Comparator.html">Comparator</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/String.html#CASE_INSENSITIVE_ORDER">CASE_INSENSITIVE_ORDER</A></B></CODE><BR> Returns a Comparator that orders <code>String</code> objects as by <code>compareToIgnoreCase</code>.</TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String()">String</A></B>()</CODE><BR> Initializes a newly created <code>String</code> object so that it represents an empty character sequence.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(byte[])">String</A></B>(byte[] bytes)</CODE><BR> Construct a new <code>String</code> by converting the specified array of bytes using the platform's default character encoding.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(byte[], int)">String</A></B>(byte[] ascii, int hibyte)</CODE><BR> <B>Deprecated.</B> <I>This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the <code>String</code> constructors that take a character-encoding name or that use the platform's default encoding.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(byte[], int, int)">String</A></B>(byte[] bytes, int offset, int length)</CODE><BR> Construct a new <code>String</code> by converting the specified subarray of bytes using the platform's default character encoding.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(byte[], int, int, int)">String</A></B>(byte[] ascii, int hibyte, int offset, int count)</CODE><BR> <B>Deprecated.</B> <I>This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the <code>String</code> constructors that take a character-encoding name or that use the platform's default encoding.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(byte[], int, int, java.lang.String)">String</A></B>(byte[] bytes, int offset, int length, <A HREF="../../java/lang/String.html">String</A> enc)</CODE><BR> Construct a new <code>String</code> by converting the specified subarray of bytes using the specified character encoding.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(byte[], java.lang.String)">String</A></B>(byte[] bytes, <A HREF="../../java/lang/String.html">String</A> enc)</CODE><BR> Construct a new <code>String</code> by converting the specified array of bytes using the specified character encoding.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(char[])">String</A></B>(char[] value)</CODE><BR> Allocates a new <code>String</code> so that it represents the sequence of characters currently contained in the character array argument.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(char[], int, int)">String</A></B>(char[] value, int offset, int count)</CODE><BR> Allocates a new <code>String</code> that contains characters from a subarray of the character array argument.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(java.lang.String)">String</A></B>(<A HREF="../../java/lang/String.html">String</A> value)</CODE><BR> Initializes a newly created <code>String</code> object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/String.html#String(java.lang.StringBuffer)">String</A></B>(<A HREF="../../java/lang/StringBuffer.html">StringBuffer</A> buffer)</CODE><BR> Allocates a new string that contains the sequence of characters currently contained in the string buffer argument.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%">⌨️ 快捷键说明
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