java.lang.Boolean翻译

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Boolean (Java 2 Platform SE v1.4.2)

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<H2>

java.lang

Class Boolean</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">java.lang.Boolean

</PRE>

<DL>

<DT>All Implemented Interfaces: <DD><A HREF="../../java/io/Serializable.html" title="interface in java.io">Serializable</A></DD>

</DL>

<HR>

<DL>

<DT>public final class Boolean<DT>extends <A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A><DT>implements <A HREF="../../java/io/Serializable.html" title="interface in java.io">Serializable</A></DL>

The Boolean class wraps a value of the primitive type

<code>boolean</code> in an object. An object of type

<code>Boolean</code> contains a single field whose type is

<code>boolean</code>.

Boolean类以对象的形式对简单类型boolean进行包装，一个Boolean类型的对象包含一个类型为boolean的域。

In addition, this class provides many methods for

converting a <code>boolean</code> to a <code>String</code> and a

<code>String</code> to a <code>boolean</code>, as well as other

constants and methods useful when dealing with a

<code>boolean</code>.

而且，该类提供了很多将boolean转化成String或者String转化成boolean的方法，在处理boolean时其他的一些常量和方法同样有用。

<DL>

<DT>Since:</DT>

<DT>See Also:<DD><A HREF="../../serialized-form.html#java.lang.Boolean">Serialized Form</A></DL>

<HR>

Field Summary</TD>

</TR>

<CODE>static <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A></CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#FALSE">FALSE</A></CODE>

The <code>Boolean</code> object corresponding to the primitive

value <code>false</code>.相当于简单类型false的Boolean对象。 </TD>

</TR>

<CODE>static <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A></CODE></TD>

The <code>Boolean</code> object corresponding to the primitive

value <code>true</code>.相当于简单类型true的Boolean对象。。</TD>

</TR>

<CODE>static <A HREF="../../java/lang/Class.html" title="class in java.lang">Class</A></CODE></TD>

The Class object representing the primitive type boolean.表示简单类型boolean的Class对象。</TD>

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Constructor Summary</TD>

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<TD><CODE><A HREF="../../java/lang/Boolean.html#Boolean(boolean)">Boolean</A>(boolean value)</CODE>

Allocates a <code>Boolean</code> object representing the

<code>value</code> argument.创建表示value参数值的Boolean对象。</TD>

</TR>

<TD><CODE><A HREF="../../java/lang/Boolean.html#Boolean(java.lang.String)">Boolean</A>(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> s)</CODE>

Allocates a <code>Boolean</code> object representing the value

<code>true</code> if the string argument is not <code>null</code>

and is equal, ignoring case, to the string <code>"true"</code>.如果string参数不为null（忽略大小写）且等于字符串true，则创建表示true值的Boolean对象。</TD>

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Method Summary</TD>

</TR>

<CODE> boolean</CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#booleanValue()">booleanValue</A>()</CODE>

Returns the value of this <tt>Boolean</tt> object as a boolean

primitive.以boolean简单类型返回Boolean对象的值。</TD>

</TR>

<CODE> boolean</CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#equals(java.lang.Object)">equals</A>(<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A> obj)</CODE>

Returns <code>true</code> if and only if the argument is not

<code>null</code> and is a <code>Boolean </code>object that

represents the same <code>boolean</code> value as this object.

只有当该参数是个不为null的Boolean对象，和自身对象表示的boolean值相等时，返回true。</TD>

</TR>

<CODE>static boolean</CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#getBoolean(java.lang.String)">getBoolean</A>(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> name)</CODE>

Returns <code>true</code> if and only if the system property

named by the argument exists and is equal to the string

<code>"true"</code>.只有当以参数命名的系统属性存在且等于字符串true时，返回true。</TD>

</TR>

<TD><CODE><A HREF="../../java/lang/Boolean.html#hashCode()">hashCode</A>()</CODE>

Returns a hash code for this <tt>Boolean</tt> object.返回该Boolean对象的hash码。</TD>

</TR>

<CODE> <A HREF="../../java/lang/String.html" title="class in java.lang">String</A></CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#toString()">toString</A>()</CODE>

Returns a <tt>String</tt> object representing this Boolean's

value.返回该Boolean值的字符串形式。</TD>

</TR>

<CODE>static <A HREF="../../java/lang/String.html" title="class in java.lang">String</A></CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#toString(boolean)">toString</A>(boolean b)</CODE>

Returns a <tt>String</tt> object representing the specified

boolean.返回指定boolean值的字符串形式。</TD>

</TR>

<CODE>static <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A></CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#valueOf(boolean)">valueOf</A>(boolean b)</CODE>

Returns a <tt>Boolean</tt> instance representing the specified

<tt>boolean</tt> value.返回指定boolean值的Boolean形式。</TD>

</TR>

<CODE>static <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A></CODE></TD>

<TD><CODE><A HREF="../../java/lang/Boolean.html#valueOf(java.lang.String)">valueOf</A>(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> s)</CODE>

Returns a <code>Boolean</code> with a value represented by the

specified String.返回指定字符串的Boolean形式。</TD>

</TR>

</TABLE>

<TD>Methods inherited from class java.lang.<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></TD>

</TR>

<TD><CODE><A HREF="../../java/lang/Object.html#clone()">clone</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#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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Field Detail</TD>

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TRUE</H3>

<PRE>

public static final <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A> TRUE</PRE>

<DL>

<DD>The <code>Boolean</code> object corresponding to the primitive

value <code>true</code>.相当于简单类型true的Boolean对象。

<DL>

</DL>

<HR>

FALSE</H3>

<PRE>

public static final <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A> FALSE</PRE>

<DL>

<DD>The <code>Boolean</code> object corresponding to the primitive

value <code>false</code>.相当于简单类型false的Boolean对象。

<DL>

</DL>

<HR>

TYPE</H3>

<PRE>

public static final <A HREF="../../java/lang/Class.html" title="class in java.lang">Class</A> TYPE</PRE>

<DL>

<DD>The Class object representing the primitive type boolean.表示简单类型boolean的Class对象。

<DL>

<DT>Since:</DT>

</DL>

Constructor Detail</TD>

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</TABLE>

Boolean</H3>

<PRE>

public Boolean(boolean value)</PRE>

<DL>

<DD>Allocates a <code>Boolean</code> object representing the

<code>value</code> argument. 创建表示value参数值的Boolean对象。

Note: It is rarely appropriate to use this constructor.

Unless a new instance is required, the static factory

<A HREF="../../java/lang/Boolean.html#valueOf(boolean)"><CODE>valueOf(boolean)</CODE></A> is generally a better choice. It is

likely to yield significantly better space and time performance.

使用该构造函数一般是不恰当的，除非需要new一个实例，通常情况下使用静态工厂方法valueOf(boolean)更好，那可能获取更好的空间和时间性能。

<DT>Parameters:<DD><CODE>value</CODE> - the value of the <code>Boolean</code>.Boolean的值。</DL>

<HR>

Boolean</H3>

<PRE>

public Boolean(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> s)</PRE>

<DL>

<DD>Allocates a <code>Boolean</code> object representing the value

<code>true</code> if the string argument is not <code>null</code>

and is equal, ignoring case, to the string <code>"true"</code>.

Otherwise, allocate a <code>Boolean</code> object representing the

value <code>false</code>. Examples:如果string参数不为null（忽略大小写）且等于字符串true，则创建表示true值的Boolean对象。

否则创建表示false值的Boolean对象。

<tt>new Boolean("True")</tt> produces a <tt>Boolean</tt> object

that represents <tt>true</tt>.生成表示true的Boolean对象。

<tt>new Boolean("yes")</tt> produces a <tt>Boolean</tt> object

that represents <tt>false</tt>.生成表示false的Boolean对象。

<DT>Parameters:<DD><CODE>s</CODE> - the string to be converted to a <code>Boolean</code>.用来转换成Boolean的字符串。</DL>

Method Detail</TD>

</TR>

</TABLE>

booleanValue</H3>

<PRE>

public boolean booleanValue()</PRE>

<DL>

<DD>Returns the value of this <tt>Boolean</tt> object as a boolean

primitive.以boolean简单类型返回Boolean对象的值。

</DL>

</DD>

<DT>Returns:<DD>the primitive <code>boolean</code> value of this object.该对象的boolean值。</DL>

</DD>

</DL>

<HR>

valueOf</H3>

<PRE>

public static <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A> valueOf(boolean b)</PRE>

<DL>

<DD>Returns a <tt>Boolean</tt> instance representing the specified

<tt>boolean</tt> value. If the specified <tt>boolean</tt> value

is <tt>true</tt>, this method returns <tt>Boolean.TRUE</tt>;

if it is <tt>false</tt>, this method returns <tt>Boolean.FALSE</tt>.

If a new <tt>Boolean</tt> instance is not required, this method

should generally be used in preference to the constructor

<A HREF="../../java/lang/Boolean.html#Boolean(boolean)"><CODE>Boolean(boolean)</CODE></A>, as this method is likely to to yield

significantly better space and time performance.

返回指定boolean值的Boolean形式。如果指定boolean值为true，该方法返回Boolean.TRUE；如果为false，返回Boolean.FALSE。

如果不需要生成一个新的Boolean实例，优先使用该方法，而不是构造函数Boolean(boolean)，该方法可能会带来更好的空间和时间性能。

</DL>

</DD>

<DT>Parameters:<DD><CODE>b</CODE> - a boolean value.boolean值。

<DT>Returns:<DD>a <tt>Boolean</tt> instance representing <tt>b</tt>.表示b的Boolean实例。<DT>Since:</DT>

</DL>

</DD>

</DL>

<HR>

valueOf</H3>

<PRE>

public static <A HREF="../../java/lang/Boolean.html" title="class in java.lang">Boolean</A> valueOf(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> s)</PRE>

<DL>

<DD>Returns a <code>Boolean</code> with a value represented by the

specified String. The <code>Boolean</code> returned represents the

value <code>true</code> if the string argument is not <code>null</code>

and is equal, ignoring case, to the string <code>"true"</code>.

返回指定字符串的Boolean形式。如果该字符串参数不为空（忽略大小写）且等于字符串true，返回表示true的Boolean对象。

Example: <tt>Boolean.valueOf("True")</tt> returns <tt>true</tt>.

Example: <tt>Boolean.valueOf("yes")</tt> returns <tt>false</tt>.

</DL>

</DD>

<DT>Parameters:<DD><CODE>s</CODE> - a string.字符串。

<DT>Returns:<DD>the <code>Boolean</code> value represented by the string.字符串的Boolean值。</DL>

</DD>

</DL>

<HR>

toString</H3>

<PRE>

public static <A HREF="../../java/lang/String.html" title="class in java.lang">String</A> toString(boolean b)</PRE>

<DL>

<DD>Returns a <tt>String</tt> object representing the specified

boolean. If the specified boolean is <code>true</code>, then

the string <tt>"true"</tt> will be returned, otherwise the

string <tt>"false"</tt> will be returned.

返回指定boolean值的字符串形式。如果指定的boolean值为true，返回字符串true，否则返回字符串false。

</DL>

</DD>

<DT>Parameters:<DD><CODE>b</CODE> - the boolean to be converted被转换的boolean值

<DT>Returns:<DD>the string representation of the specified <code>boolean</code>指定boolean的字符串形式<DT>Since:</DT>

</DL>

</DD>

</DL>

<HR>

toString</H3>

<PRE>

public <A HREF="../../java/lang/String.html" title="class in java.lang">String</A> toString()</PRE>

<DL>

<DD>Returns a <tt>String</tt> object representing this Boolean's

value. If this object represents the value <code>true</code>,

a string equal to <code>"true"</code> is returned. Otherwise, a

string equal to <code>"false"</code> is returned.

返回该Boolean值的字符串形式。如果该对象表示true值，返回字符串true，否则返回字符串false。

<DT>Overrides:<DD><CODE><A HREF="../../java/lang/Object.html#toString()">toString</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></CODE></DL>

</DD>

<DT>Returns:<DD>a string representation of this object.表示该对象的字符串形式。</DL>

</DD>

</DL>

<HR>

hashCode</H3>

<PRE>

public int hashCode()</PRE>

<DL>

<DD>Returns a hash code for this <tt>Boolean</tt> object.返回该Boolean对象的hash码。

<DT>Overrides:<DD><CODE><A HREF="../../java/lang/Object.html#hashCode()">hashCode</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></CODE></DL>

</DD>

<DT>Returns:<DD>the integer <tt>1231</tt> if this object represents

<tt>true</tt>; returns the integer <tt>1237</tt> if this

object represents <tt>false</tt>.

如果该对象表示true，返回整数1231，如果该对象表示false，返回1237。<DT>See Also:<DD><A HREF="../../java/lang/Object.html#equals(java.lang.Object)"><CODE>Object.equals(java.lang.Object)</CODE></A>,

<A HREF="../../java/util/Hashtable.html" title="class in java.util"><CODE>Hashtable</CODE></A></DL>

</DD>

</DL>

<HR>

equals</H3>

<PRE>

public boolean equals(<A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A> obj)</PRE>

<DL>

<DD>Returns <code>true</code> if and only if the argument is not

<code>null</code> and is a <code>Boolean </code>object that

represents the same <code>boolean</code> value as this object.

只有当该参数是个不为null的Boolean对象，和自身对象表示的boolean值相等时，返回true。

<DT>Overrides:<DD><CODE><A HREF="../../java/lang/Object.html#equals(java.lang.Object)">equals</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html" title="class in java.lang">Object</A></CODE></DL>

</DD>

<DT>Parameters:<DD><CODE>obj</CODE> - the object to compare with.用来比较的对象。

<DT>Returns:<DD><code>true</code> if the Boolean objects represent the

same value; <code>false</code> otherwise.如果Boolean对象表示相同的值时为true，否则为false。<DT>See Also:<DD><A HREF="../../java/lang/Object.html#hashCode()"><CODE>Object.hashCode()</CODE></A>,

<A HREF="../../java/util/Hashtable.html" title="class in java.util"><CODE>Hashtable</CODE></A></DL>

</DD>

</DL>

<HR>

getBoolean</H3>

<PRE>

public static boolean getBoolean(<A HREF="../../java/lang/String.html" title="class in java.lang">String</A> name)</PRE>

<DL>

<DD>Returns <code>true</code> if and only if the system property

named by the argument exists and is equal to the string

<code>"true"</code>. (Beginning with version 1.0.2 of the

JavaTM platform, the test of

this string is case insensitive.) A system property is accessible

through <code>getProperty</code>, a method defined by the

<code>System</code> class.

只有当以参数命名的系统属性存在且等于字符串true时，返回true。（版本Java平台1.0.2开始，字符串的测试是忽略大小写的。）

系统属性可以通过System类的getProperty方法访问。

If there is no property with the specified name, or if the specified

name is empty or null, then <code>false</code> is returned.

如果没有指定名称的属性，或者指定的名称为空或null，那么返回false。

</DL>

</DD>

<DT>Parameters:<DD><CODE>name</CODE> - the system property name.系统属性名称。

<DT>Returns:<DD>the <code>boolean</code> value of the system property.系统属性的boolean值。<DT>See Also:<DD><A HREF="../../java/lang/System.html#getProperty(java.lang.String)"><CODE>System.getProperty(java.lang.String)</CODE></A>,

<A HREF="../../java/lang/System.html#getProperty(java.lang.String, java.lang.String)"><CODE>System.getProperty(java.lang.String, java.lang.String)</CODE></A></DL>

</DD>

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