Java System.out是缓冲的还是非缓冲的？

系统输出是缓冲还是非缓冲

我读到这是一个
InputStream
的对象，
PrinterStream
是
System.out
引用的对象类型

它们都是未缓冲的，所以为什么
println（）
会刷新未缓冲的…是否可以刷新未缓冲的，我已经读到它们会立即写入。
是“标准”输出。在大多数情况下，终端io是缓冲的，并且支持分页

从Javadoc

“标准”输出流。此流已打开并准备接受输出数据。通常，此流对应于主机环境或用户指定的显示输出或另一个输出目标

发件人：

可选地，可以创建打印流以便自动刷新；这意味着在写入字节数组、调用某个println方法或写入换行符或字节（'\n'）后，将自动调用flush方法
 System.out.println将传递的参数打印到通常为标准输出的System.out中

System – is a final class and cannot be inherited. As per javadoc, “…Among the facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined properties and environment variables; a means of loading files and libraries; and a utility method for quickly copying a portion of an array…”
out – is a static member field of System class and is of type PrintStream. Its access specifiers are public final. This gets instantiated during startup and gets mapped with standard output console of the host. This stream is open by itself immediately after its instantiation and ready to accept data.
println – println prints the argument passed to the standard console and a newline. There are multiple println methods with different arguments (overloading). Every println makes a call to print method and adds a newline. print calls write() and the story goes on like that.

您可以访问此链接OK，这是正确的系统。输出已缓冲。。。但我也想知道缓冲输入流是什么意思？考虑管道。一个进程写，一个进程读。但是我在哪里提到了缓冲输入流呢？如果您正在读取中的标准（或另一个进程的输出），则必须有一个要读取的输入流。