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MID Profile: Class Object
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SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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java.lang</FONT>
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Class Object</H2>
<PRE>
<B>java.lang.Object</B>
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<DT>public class <B>Object</B></DL>
<P>
Class <code>Object</code> is the root of the class hierarchy. Every class has <code>Object</code> as a superclass. All objects, including arrays, implement the methods of this class.
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<DT><B>Since: </B><DD>JDK1.0, CLDC 1.0</DD>
<DT><B>See Also: </B><DD><A HREF="../../java/lang/Class.html"><CODE>Class</CODE></A></DL>
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<B>Constructor Summary</B></FONT></TD>
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<TD><CODE><B><A HREF="../../java/lang/Object.html#Object()">Object</A></B>()</CODE>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A></B>(<A HREF="../../java/lang/Object.html">Object</A> obj)</CODE>
<BR>
Indicates whether some other object is "equal to" this one.</TD>
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<CODE> <A HREF="../../java/lang/Class.html">Class</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#getClass()">getClass</A></B>()</CODE>
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Returns the runtime class of an object.</TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#hashCode()">hashCode</A></B>()</CODE>
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Returns a hash code value for the object.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#notify()">notify</A></B>()</CODE>
<BR>
Wakes up a single thread that is waiting on this object's monitor.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#notifyAll()">notifyAll</A></B>()</CODE>
<BR>
Wakes up all threads that are waiting on this object's monitor.</TD>
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<CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#toString()">toString</A></B>()</CODE>
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Returns a string representation of the object.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#wait()">wait</A></B>()</CODE>
<BR>
Causes current thread to wait until another thread invokes the <A HREF="../../java/lang/Object.html#notify()"><CODE>notify()</CODE></A> method or the <A HREF="../../java/lang/Object.html#notifyAll()"><CODE>notifyAll()</CODE></A> method for this object.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#wait(long)">wait</A></B>(long timeout)</CODE>
<BR>
Causes current thread to wait until either another thread invokes the <A HREF="../../java/lang/Object.html#notify()"><CODE>notify()</CODE></A> method or the <A HREF="../../java/lang/Object.html#notifyAll()"><CODE>notifyAll()</CODE></A> method for this object, or a specified amount of time has elapsed.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../java/lang/Object.html#wait(long, int)">wait</A></B>(long timeout, int nanos)</CODE>
<BR>
Causes current thread to wait until another thread invokes the <A HREF="../../java/lang/Object.html#notify()"><CODE>notify()</CODE></A> method or the <A HREF="../../java/lang/Object.html#notifyAll()"><CODE>notifyAll()</CODE></A> method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.</TD>
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<A NAME="Object()"><!-- --></A><H3>
Object</H3>
<PRE>
public <B>Object</B>()</PRE>
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<A NAME="getClass()"><!-- --></A><H3>
getClass</H3>
<PRE>
public final <A HREF="../../java/lang/Class.html">Class</A> <B>getClass</B>()</PRE>
<DL>
<DD>Returns the runtime class of an object. That <tt>Class</tt> object is the object that is locked by <tt>static synchronized</tt> methods of the represented class.<DD><DL>
<DT><B>Returns:</B><DD>the object of type <code>Class</code> that represents the runtime class of the object.</DL>
</DD>
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<HR>
<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided by <code>java.util.Hashtable</code>. <p> The general contract of <code>hashCode</code> is: <ul> <li>Whenever it is invoked on the same object more than once during an execution of a Java application, the <tt>hashCode</tt> method must consistently return the same integer, provided no information used in <tt>equals</tt> comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. <li>If two objects are equal according to the <tt>equals(Object)</tt> method, then calling the <code>hashCode</code> method on each of the two objects must produce the same integer result. <li>It is <em>not</em> required that if two objects are unequal according to the <A HREF="../../java/lang/Object.html#equals(java.lang.Object)"><CODE>equals(java.lang.Object)</CODE></A> method, then calling the <tt>hashCode</tt> method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hashtables. </ul> <p> As much as is reasonably practical, the hashCode method defined by class <tt>Object</tt> does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java<font size="-2"><sup>TM</sup></font> programming language.)<DD><DL>
<DT><B>Returns:</B><DD>a hash code value for this object.<DT><B>See Also: </B><DD><A HREF="../../java/lang/Object.html#equals(java.lang.Object)"><CODE>equals(java.lang.Object)</CODE></A>,
<A HREF="../../java/util/Hashtable.html"><CODE>Hashtable</CODE></A></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> obj)</PRE>
<DL>
<DD>Indicates whether some other object is "equal to" this one. <p> The <code>equals</code> method implements an equivalence relation: <ul> <li>It is <i>reflexive</i>: for any reference value <code>x</code>, <code>x.equals(x)</code> should return <code>true</code>. <li>It is <i>symmetric</i>: for any reference values <code>x</code> and <code>y</code>, <code>x.equals(y)</code> should return <code>true</code> if and only if <code>y.equals(x)</code> returns <code>true</code>. <li>It is <i>transitive</i>: for any reference values <code>x</code>, <code>y</code>, and <code>z</code>, if <code>x.equals(y)</code> returns <code>true</code> and <code>y.equals(z)</code> returns <code>true</code>, then <code>x.equals(z)</code> should return <code>true</code>. <li>It is <i>consistent</i>: for any reference values <code>x</code> and <code>y</code>, multiple invocations of <tt>x.equals(y)</tt> consistently return <code>true</code> or consistently return <code>false</code>, provided no information used in⌨️ 快捷键说明
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