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java.lang.NullPointerException翻译

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NullPointerException (Java 2 Platform SE v1.4.2)
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java.lang
 
Class NullPointerException</H2>
<PRE>
<A HREF="../../java/lang/Object.html" title="class in java.lang">java.lang.Object</A>
<IMG SRC="../../resources/inherit.gif" ALT="extended by"><A HREF="../../java/lang/Throwable.html" title="class in java.lang">java.lang.Throwable</A>
 <IMG SRC="../../resources/inherit.gif" ALT="extended by"><A HREF="../../java/lang/Exception.html" title="class in java.lang">java.lang.Exception</A>
 <IMG SRC="../../resources/inherit.gif" ALT="extended by"><A HREF="../../java/lang/RuntimeException.html" title="class in java.lang">java.lang.RuntimeException</A>
 <IMG SRC="../../resources/inherit.gif" ALT="extended by">java.lang.NullPointerException
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<DT>All Implemented Interfaces: <DD><A HREF="../../java/io/Serializable.html" title="interface in java.io">Serializable</A></DD>
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<DT>public class NullPointerException<DT>extends <A HREF="../../java/lang/RuntimeException.html" title="class in java.lang">RuntimeException</A></DL>

Thrown when an application attempts to use <code>null</code> in a
case where an object is required. These include:
当应用程序需要一个对象的情况下，却试图使用null值时抛出。包括：
<ul>
<li>Calling the instance method of a <code>null</code> object.
调用null对象的实例方法。
<li>Accessing or modifying the field of a <code>null</code> object.
访问或修改null对象的域。
<li>Taking the length of <code>null</code> as if it were an array.
将null对象作为数组获取其长度。
<li>Accessing or modifying the slots of <code>null</code> as if it
 were an array.
 将null对象作为数组访问其时间片。
<li>Throwing <code>null</code> as if it were a <code>Throwable</code>
 value.
 将null对象作为Throwable对象抛出。
</ul>

Applications should throw instances of this class to indicate
other illegal uses of the <code>null</code> object.
应用程序中其他非法使用null对象的情况也应该抛出该异常。

<DL>
<DT>Since:</DT>
<DD>JDK1.0</DD>
<DT>See Also:<DD><A HREF="../../serialized-form.html#java.lang.NullPointerException">Serialized Form</A></DL>
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Constructor Summary</TD>
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<TD><CODE><A HREF="../../java/lang/NullPointerException.html#NullPointerException()">NullPointerException</A>()</CODE>

Constructs a <code>NullPointerException</code> with no detail message.
创建一个不含详细信息的NullPointerException。</TD>
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<TD><CODE><A HREF="../../java/lang/NullPointerException.html#NullPointerException(java.lang.String)">NullPointerException</A>(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> s)</CODE>

Constructs a <code>NullPointerException</code> with the specified
detail message.创建一个指定详细信息的NullPointerException。</TD>
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<TD>Methods inherited from class java.lang.<A HREF="../../java/lang/Throwable.html" title="class in java.lang">Throwable</A></TD>
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<TD><CODE><A HREF="../../java/lang/Throwable.html#fillInStackTrace()">fillInStackTrace</A>, <A HREF="../../java/lang/Throwable.html#getCause()">getCause</A>, <A HREF="../../java/lang/Throwable.html#getLocalizedMessage()">getLocalizedMessage</A>, <A HREF="../../java/lang/Throwable.html#getMessage()">getMessage</A>, <A HREF="../../java/lang/Throwable.html#getStackTrace()">getStackTrace</A>, <A HREF="../../java/lang/Throwable.html#initCause(java.lang.Throwable)">initCause</A>, <A HREF="../../java/lang/Throwable.html#printStackTrace()">printStackTrace</A>, <A HREF="../../java/lang/Throwable.html#printStackTrace(java.io.PrintStream)">printStackTrace</A>, <A HREF="../../java/lang/Throwable.html#printStackTrace(java.io.PrintWriter)">printStackTrace</A>, <A HREF="../../java/lang/Throwable.html#setStackTrace(java.lang.StackTraceElement[])">setStackTrace</A>, <A HREF="../../java/lang/Throwable.html#toString()">toString</A></CODE></TD>
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<TD>Methods inherited from class java.lang.<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></TD>
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<TD><CODE><A HREF="../../java/lang/Object.html#clone()">clone</A>, <A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A>, <A HREF="../../java/lang/Object.html#finalize()">finalize</A>, <A HREF="../../java/lang/Object.html#getClass()">getClass</A>, <A HREF="../../java/lang/Object.html#hashCode()">hashCode</A>, <A HREF="../../java/lang/Object.html#notify()">notify</A>, <A HREF="../../java/lang/Object.html#notifyAll()">notifyAll</A>, <A HREF="../../java/lang/Object.html#wait()">wait</A>, <A HREF="../../java/lang/Object.html#wait(long)">wait</A>, <A HREF="../../java/lang/Object.html#wait(long, int)">wait</A></CODE></TD>
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<A NAME="NullPointerException()"></A><H3>
NullPointerException</H3>
<PRE>
public NullPointerException()</PRE>
<DL>
<DD>Constructs a <code>NullPointerException</code> with no detail message.创建一个不含详细信息的NullPointerException。

</DL>
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<A NAME="NullPointerException(java.lang.String)"></A><H3>
NullPointerException</H3>
<PRE>
public NullPointerException(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> s)</PRE>
<DL>
<DD>Constructs a <code>NullPointerException</code> with the specified
detail message.创建一个指定详细信息的NullPointerException。

<DT>Parameters:<DD><CODE>s</CODE> - the detail message.详细信息。</DL>

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