知识补充:
Runtime
:运行时,是一个封装了JVM进程的类。每一个JAVA程序实际上都是启动了一个JVM进程,那么每一个进程都是对应这一个Runtime实例,其实例是由JVM为其初始化的。
Runtime类的常用方法
public static Runtime getRuntime():
普通方法 用于取得Runtime类的实例
public long freeMemory():
普通方法 用于返回Java虚拟机中的空闲内存
public long maxMemory():
返回JVM的最大内存量
public void gc():
运行垃圾回收器、释放空间
public Process exec(String command) throws IOException
执行本机命令
一旦取得实例后,以上的方法就可以进行操作了。
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示例如下:
public static void main(final String[] args) throws IOException { openWindowsExe(); openExe(); openFile(); } // 用 Java 调用windows系统的exe文件,比如notepad,calc之类 public static void openWindowsExe() { final Runtime runtime = Runtime.getRuntime(); Process process = null; try { final String command = "notepad";// 记事本 process = runtime.exec(command); } catch (final Exception e) { System.out.println("Error win exec!"); } } // 调用其他的可执行文件,例如:自己制作的exe,或是 下载 安装的软件. public static void openExe() { final Runtime runtime = Runtime.getRuntime(); Process process = null; try { process = runtime.exec("C:\\Program Files\\Notepad++\\notepad++.exe"); } catch (final Exception e) { System.out.println("Error exec!"); } } // 打开其他任意格式的文件,比如txt,word等 public static void openFile() { final Runtime runtime = Runtime.getRuntime(); Process process = null;// final String cmd = "rundll32 url.dll FileProtocolHandler file://F:\\ECT项目资料\\建立EMF工程.txt"; try { process = runtime.exec(cmd); } catch (final Exception e) { System.out.println("Error exec!"); } }
想学习更多相关文章教程请访问:java入门
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