可能的重复：
Java中System.out.println的含义是什么？ https://stackoverflow.com/questions/3406703/whats-the-meaning-of-system-out-println-in-java
我一直在寻找什么的答案System, out and println are in System.out.println()在爪哇。我搜索并找到了一个不同的答案，如下所示：
System is a built-in class present in java.lang package.
This class has a final modifier, which means that, it cannot be inherited by other classes.
It contains pre-defined methods and fields, which provides facilities like standard input, output, etc.
out is a static final field (ie, variable)in System class which is of the type PrintStream (a built-in class, contains methods to print the different data values).
static fields and methods must be accessed by using the class name, so ( System.out ).
out here denotes the reference variable of the type PrintStream class.
println() is a public method in PrintStream class to print the data values.
Hence to access a method in PrintStream class, we use out.println() (as non static methods and fields can only be accessed by using the refrence varialble)
在另一页中，我找到了另一个对比定义：
System.out.print是java中使用的标准输出函数。其中 System 指定包名称，out 指定类名称，print 是该类中的函数。
我对这些很困惑。有人能准确地告诉我它们是什么吗？
System是最后一堂课java.lang包裹。
out是类型的类变量PrintStream声明于System class.
println是一种方法PrintStream class.
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