java.lang.class <cls>和Cls有什么区别？

Question

<Style x:Key="ScrollBarTrackThumb" TargetType="{x:Type Thumb}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Thumb}"> <Grid x:Name="Grid"> <Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Fill="Transparent" /> <Border x:Name="CornerScrollBarRectangle" CornerRadius="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto" Height="Auto" Margin="0,1,0,1" Background="{TemplateBinding Background}" /> </Grid> <ControlTemplate.Triggers> <Trigger Property="Tag" Value="Horizontal"> <Setter TargetName="CornerScrollBarRectangle" Property="Width" Value="Auto" /> <Setter TargetName="CornerScrollBarRectangle" Property="Height" Value="6" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="{x:Type ScrollBar}" x:Key="BlackBGScrollBar"> <Setter Property="Stylus.IsFlicksEnabled" Value="false" /> <Setter Property="Foreground" Value="#ADABAB" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="Width" Value="7" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ScrollBar}"> <Grid x:Name="GridRoot" Width="7" Background="{TemplateBinding Background}"> <Grid.RowDefinitions> <RowDefinition Height="0.00001*" /> </Grid.RowDefinitions> <Track x:Name="PART_Track" Grid.Row="0" IsDirectionReversed="true" Focusable="false"> <Track.Thumb> <Thumb x:Name="Thumb" Background="{TemplateBinding Foreground}" Style="{DynamicResource ScrollBarTrackThumb}" /> </Track.Thumb> <Track.IncreaseRepeatButton> <RepeatButton x:Name="PageUp" Command="ScrollBar.PageDownCommand" Opacity="0" Focusable="false" /> </Track.IncreaseRepeatButton> <Track.DecreaseRepeatButton> <RepeatButton x:Name="PageDown" Command="ScrollBar.PageUpCommand" Opacity="0" Focusable="false" /> </Track.DecreaseRepeatButton> </Track> </Grid> <ControlTemplate.Triggers> <Trigger SourceName="Thumb" Property="IsMouseOver" Value="true"> <Setter Value="{DynamicResource ButtonSelectBrush}" TargetName="Thumb" Property="Background" /> </Trigger> <Trigger SourceName="Thumb" Property="IsDragging" Value="true"> <Setter Value="{DynamicResource DarkBrush}" TargetName="Thumb" Property="Background" /> </Trigger> <Trigger Property="IsEnabled" Value="false"> <Setter TargetName="Thumb" Property="Visibility" Value="Collapsed" /> </Trigger> <Trigger Property="Orientation" Value="Horizontal"> <Setter TargetName="GridRoot" Property="LayoutTransform"> <Setter.Value> <RotateTransform Angle="-90" /> </Setter.Value> </Setter> <Setter TargetName="PART_Track" Property="LayoutTransform"> <Setter.Value> <RotateTransform Angle="-90" /> </Setter.Value> </Setter> <Setter Property="Width" Value="Auto" /> <Setter Property="Height" Value="8" /> <Setter TargetName="Thumb" Property="Tag" Value="Horizontal" /> <Setter TargetName="PageDown" Property="Command" Value="ScrollBar.PageLeftCommand" /> <Setter TargetName="PageUp" Property="Command" Value="ScrollBar.PageRightCommand" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style TargetType="ScrollViewer" x:Key="BlackBGScrollViewer"> <Setter Property="HorizontalContentAlignment" Value="Left" /> <Setter Property="VerticalContentAlignment" Value="Top" /> <Setter Property="VerticalScrollBarVisibility" Value="Visible" /> <Setter Property="Padding" Value="4"/> <Setter Property="BorderThickness" Value="0"/> <Setter Property="BorderBrush"> <Setter.Value> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFA3AEB9" Offset="0"/> <GradientStop Color="#FF8399A9" Offset="0.375"/> <GradientStop Color="#FF718597" Offset="0.375"/> <GradientStop Color="#FF617584" Offset="1"/> </LinearGradientBrush> </Setter.Value> </Setter> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="ScrollViewer"> <Border CornerRadius="2" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <Grid Background="{TemplateBinding Background}"> <Grid.RowDefinitions> <RowDefinition Height="*"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="Auto"/> </Grid.ColumnDefinitions> <ScrollContentPresenter x:Name="ScrollContentPresenter" Cursor="{TemplateBinding Cursor}" Margin="{TemplateBinding Padding}" ContentTemplate="{TemplateBinding ContentTemplate}"/> <Rectangle Grid.Column="1" Grid.Row="1" Fill="#FFE9EEF4"/> <ScrollBar x:Name="VerticalScrollBar" Width="18" IsTabStop="False" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Grid.Column="1" Grid.Row="0" Orientation="Vertical" ViewportSize="{TemplateBinding ViewportHeight}" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0" Value="{TemplateBinding VerticalOffset}" Margin="0,-1,-1,-1" Style="{StaticResource BlackBGScrollBar}"/> <ScrollBar x:Name="HorizontalScrollBar" Height="18" IsTabStop="False" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Grid.Column="0" Grid.Row="1" Orientation="Horizontal" ViewportSize="{TemplateBinding ViewportWidth}" Maximum="{TemplateBinding ScrollableWidth}" Minimum="0" Value="{TemplateBinding HorizontalOffset}" Margin="-1,0,-1,-1" Style="{StaticResource BlackBGScrollBar}"/> </Grid> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> 和java.lang.class<Cls>之间有什么区别？

我需要将它传递给函数：

Cls

我试过java.lang.Class<org.xbib.elasticsearch.action.termlist.TermlistRequest> ，但就是这样：

new TermlistRequest()

你能解释一下Java中的内容吗？以及如何创建这种类型的对象？

java.lang.class - 我错过的是我需要将org.xbib.elasticsearch.action.termlist.TermlistRequest 附加到.class以获取类型Cls

Answer 1

Class<T>和T之间的区别在于Class<T>代表有关T的元数据。您可以查找T的方法和字段，也可以通过调用newInstance方法创建新实例。

就创建Class<T>个对象而言，最简单的方法是使用MyClass.class语法，例如

Class<TermlistRequest> tr = TermlistRequest.class;

Class（但不是Class<T>）对象也可以通过resolving classes dynamically获得。