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| com.google.common.base</FONT> |
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| Class Objects</H2> |
| <PRE> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
| <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.base.Objects</B> |
| </PRE> |
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| <DT><PRE>public final class <B>Objects</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL> |
| </PRE> |
| |
| <P> |
| Helper functions that can operate on any <code>Object</code>. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Since:</B></DT> |
| <DD>2010.01.04 <b>stable</b> (imported from Google Collections Library)</DD> |
| <DT><B>Author:</B></DT> |
| <DD>Laurence Gonsalves</DD> |
| </DL> |
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| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static class</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../com/google/common/base/Objects.ToStringHelper.html" title="class in com.google.common.base">Objects.ToStringHelper</A></B></CODE> |
| |
| <BR> |
| Support class for <A HREF="../../../../com/google/common/base/Objects.html#toStringHelper(java.lang.Object)"><CODE>toStringHelper(java.lang.Object)</CODE></A>.</TD> |
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| <B>Method Summary</B></FONT></TH> |
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| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../com/google/common/base/Objects.html#equal(java.lang.Object, java.lang.Object)">equal</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> a, |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> b)</CODE> |
| |
| <BR> |
| Determines whether two possibly-null objects are equal.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static int</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../com/google/common/base/Objects.html#hashCode(java.lang.Object...)">hashCode</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>... objects)</CODE> |
| |
| <BR> |
| Generates a hash code for multiple values.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static <A HREF="../../../../com/google/common/base/Objects.ToStringHelper.html" title="class in com.google.common.base">Objects.ToStringHelper</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../com/google/common/base/Objects.html#toStringHelper(java.lang.Object)">toStringHelper</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> object)</CODE> |
| |
| <BR> |
| Creates an instance of <A HREF="../../../../com/google/common/base/Objects.ToStringHelper.html" title="class in com.google.common.base"><CODE>Objects.ToStringHelper</CODE></A>.</TD> |
| </TR> |
| </TABLE> |
| <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
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| <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD> |
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| |
| <A NAME="equal(java.lang.Object, java.lang.Object)"><!-- --></A><H3> |
| equal</H3> |
| <PRE> |
| public static boolean <B>equal</B>(<FONT SIZE="-1"><A HREF="http://jsr-305.googlecode.com/svn/trunk/javadoc/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</A></FONT> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> a, |
| <FONT SIZE="-1"><A HREF="http://jsr-305.googlecode.com/svn/trunk/javadoc/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</A></FONT> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> b)</PRE> |
| <DL> |
| <DD>Determines whether two possibly-null objects are equal. Returns: |
| |
| <ul> |
| <li><code>true</code> if <code>a</code> and <code>b</code> are both null. |
| <li><code>true</code> if <code>a</code> and <code>b</code> are both non-null and they are |
| equal according to <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang"><CODE>Object.equals(Object)</CODE></A>. |
| <li><code>false</code> in all other situations. |
| </ul> |
| |
| <p>This assumes that any non-null objects passed to this function conform |
| to the <code>equals()</code> contract. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="hashCode(java.lang.Object...)"><!-- --></A><H3> |
| hashCode</H3> |
| <PRE> |
| public static int <B>hashCode</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A>... objects)</PRE> |
| <DL> |
| <DD>Generates a hash code for multiple values. The hash code is generated by |
| calling <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Arrays.html?is-external=true#hashCode(java.lang.Object[])" title="class or interface in java.util"><CODE>Arrays.hashCode(Object[])</CODE></A>. |
| |
| <p>This is useful for implementing <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang"><CODE>Object.hashCode()</CODE></A>. For example, |
| in an object that has three properties, <code>x</code>, <code>y</code>, and |
| <code>z</code>, one could write: |
| <pre> |
| public int hashCode() { |
| return Objects.hashCode(getX(), getY(), getZ()); |
| }</pre> |
| |
| <b>Warning</b>: When a single object is supplied, the returned hash code |
| does not equal the hash code of that object. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="toStringHelper(java.lang.Object)"><!-- --></A><H3> |
| toStringHelper</H3> |
| <PRE> |
| public static <A HREF="../../../../com/google/common/base/Objects.ToStringHelper.html" title="class in com.google.common.base">Objects.ToStringHelper</A> <B>toStringHelper</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> object)</PRE> |
| <DL> |
| <DD>Creates an instance of <A HREF="../../../../com/google/common/base/Objects.ToStringHelper.html" title="class in com.google.common.base"><CODE>Objects.ToStringHelper</CODE></A>. |
| |
| <p>This is helpful for implementing <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang"><CODE>Object.toString()</CODE></A>. For |
| example, in an object that contains two member variables, <code>x</code>, |
| and <code>y</code>, one could write:<pre> <tt> |
| public class ClassName { |
| public String toString() { |
| return Objects.toStringHelper(this) |
| .add("x", x) |
| .add("y", y) |
| .toString(); |
| } |
| }</tt> |
| </pre> |
| |
| Assuming the values of <code>x</code> and <code>y</code> are 1 and 2, |
| this code snippet returns the string <tt>"ClassName{x=1, y=2}"</tt>. |
| <P> |
| <DD><DL> |
| <DT><B>Since:</B></DT> |
| <DD>2010.01.04 <b>tentative</b></DD> |
| </DL> |
| </DD> |
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