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99 lines
4.9 KiB
HTML
99 lines
4.9 KiB
HTML
<HTML><style type="text/css"> ul.inheritance {
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</style><!-- ======== START OF CLASS DATA ======== -->
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<H2>
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<FONT SIZE="-1">
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java.lang</FONT>
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<BR>
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Class String</H2>
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<PRE>
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<A HREF="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</A>
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<IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>java.lang.String</B>
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</PRE>
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<DL><DL>
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<DT><BR><PRE>public final class <B>String</B><DT><BR>extends <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A><DT><BR>implements <A HREF="../../java/io/Serializable.html" title="interface in java.io">Serializable</A>, <A HREF="../../java/lang/Comparable.html" title="interface in java.lang">Comparable</A><<A HREF="../../java/lang/String.html" title="class in java.lang">String</A>>, <A HREF="../../java/lang/CharSequence.html" title="interface in java.lang">CharSequence</A></DL>
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</PRE>
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<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../java/io/Serializable.html" title="interface in java.io">Serializable</A>, <A HREF="../../java/lang/CharSequence.html" title="interface in java.lang">CharSequence</A>, <A HREF="../../java/lang/Comparable.html" title="interface in java.lang">Comparable</A><<A HREF="../../java/lang/String.html" title="class in java.lang">String</A>></DD>
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</DL>
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<P> The <code>String</code> class represents character strings. All
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string literals in Java programs, such as <code>"abc"</code>, are
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implemented as instances of this class.
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<p>
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Strings are constant; their values cannot be changed after they
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are created. String buffers support mutable strings.
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Because String objects are immutable they can be shared. For example:
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<p><blockquote><pre>
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String str = "abc";
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</pre></blockquote><p>
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is equivalent to:
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<p><blockquote><pre>
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char data[] = {'a', 'b', 'c'};
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String str = new String(data);
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</pre></blockquote><p>
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Here are some more examples of how strings can be used:
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<p><blockquote><pre>
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System.out.println("abc");
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String cde = "cde";
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System.out.println("abc" + cde);
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String c = "abc".substring(2,3);
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String d = cde.substring(1, 2);
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</pre></blockquote>
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<p>
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The class <code>String</code> includes methods for examining
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individual characters of the sequence, for comparing strings, for
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searching strings, for extracting substrings, and for creating a
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copy of a string with all characters translated to uppercase or to
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lowercase. Case mapping is based on the Unicode Standard version
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specified by the <A HREF="../../java/lang/Character.html" title="class in java.lang"><CODE>Character</CODE></A> class.
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<p>
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The Java language provides special support for the string
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concatenation operator ( + ), and for conversion of
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other objects to strings. String concatenation is implemented
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through the <code>StringBuilder</code>(or <code>StringBuffer</code>)
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class and its <code>append</code> method.
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String conversions are implemented through the method
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<code>toString</code>, defined by <code>Object</code> and
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inherited by all classes in Java. For additional information on
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string concatenation and conversion, see Gosling, Joy, and Steele,
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<i>The Java Language Specification</i>.
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<p> Unless otherwise noted, passing a <tt>null</tt> argument to a constructor
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or method in this class will cause a <A HREF="../../java/lang/NullPointerException.html" title="class in java.lang"><CODE>NullPointerException</CODE></A> to be
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thrown.
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<p>A <code>String</code> represents a string in the UTF-16 format
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in which <em>supplementary characters</em> are represented by <em>surrogate
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pairs</em> (see the section <a href="Character.html#unicode">Unicode
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Character Representations</a> in the <code>Character</code> class for
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more information).
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Index values refer to <code>char</code> code units, so a supplementary
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character uses two positions in a <code>String</code>.
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<p>The <code>String</code> class provides methods for dealing with
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Unicode code points (i.e., characters), in addition to those for
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dealing with Unicode code units (i.e., <code>char</code> values).
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<P>
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<P>
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<DL>
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<DT><B>Since:</B></DT>
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<DD>JDK1.0</DD>
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<DT><B>See Also:</B><DD><A HREF="../../java/lang/Object.html#toString()"><CODE>Object.toString()</CODE></A>,
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<A HREF="../../java/lang/StringBuffer.html" title="class in java.lang"><CODE>StringBuffer</CODE></A>,
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<A HREF="../../java/lang/StringBuilder.html" title="class in java.lang"><CODE>StringBuilder</CODE></A>,
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<A HREF="../../java/nio/charset/Charset.html" title="class in java.nio.charset"><CODE>Charset</CODE></A>,
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<A HREF="../../serialized-form.html#java.lang.String">Serialized Form</A></DL>
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<P>
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</HTML> |