有啊,在System类下啊,你再找找看.
java.lang
Class System
java.lang.Object
java.lang.System--------------------------------------------------------------------------------public final class System
extends Object
The System class contains several useful class fields and methods. It cannot be instantiated. Among the facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined "properties"; a means of loading files and libraries; and a utility method for quickly copying a portion of an array. Since:
JDK1.0
java.lang
Class System
java.lang.Object
java.lang.System--------------------------------------------------------------------------------public final class System
extends Object
The System class contains several useful class fields and methods. It cannot be instantiated. Among the facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined "properties"; a means of loading files and libraries; and a utility method for quickly copying a portion of an array. Since:
JDK1.0
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