The System class for Java

1.System class overview

The system class contains some useful class fields and methods. It cannot be instantiated.

2. Member Methods

public static void GC () runs the garbage collector

public static void exit (int status) terminates the currently running Java Virtual machine

public static long Currenttimemillis () returns the current time of the millisecond unit

public static void Arraycopy (Object src,int srcpos,object desc,int descpos,int length) copies an array from the specified source array, starting at the specified position, Ends at the specified position in the destination array.

package cn;/** * system class  *  *   Member Method  *  PUBLIC STATIC VOID GC ()   *   Run garbage collector  *       public static void exit (Int status)   *        terminate a currently running Java Virtual machine  *      public static  Long curenttimemillis ()   *       returns the current time of the millisecond unit  *       public static void arraycopy (Object src,int srcpos,object  desc,int descpos,int length)  * Copy an array from the specified source array, copying starts at the specified position and ends at the specified position in the destination array  */public  Class systemdemo1 {public static void main (String[] args)  { System.out.println (System.currenttimemillis ());//1476179027207system.out.println ("Hello");//hellosystem.exit (0 ); SYSTEM.OUT.PRINTLN ("World");/}} 

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The System class for Java