runtimedemo.java

这是Runtime的演示

package Runtime演示;
import java.io.*;

public class RuntimeDemo
{
	public static void main(String[] args)
	{
		Runtime rt=Runtime.getRuntime();
		System.out.println(rt.freeMemory());
		System.out.println(rt.totalMemory());
		try
		{
			rt.exec("calc");
			Process p=rt.exec("javac -d . Test.java");
			InputStream is=p.getInputStream();
			int data;
			while((data=is.read())!=-1)
			{
				System.out.print((char)data);
			}		
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
			e.printStackTrace();
		}
	}
	
}