java內存的查看和記事本的打開

import java.io.IOException;

public class GetMemory
{
	public static void main(String args[]) throws IOException 
	{
		Runtime rt = Runtime.getRuntime();
	    long mem1, mem2;
		Integer someints[] = new Integer[100];
		System.out.println("總內存: " +rt.totalMemory());//總內存
		mem1 = rt.freeMemory();  //可用內存
		System.out.println("可用內存: " + mem1);
		rt.gc();	    //內存回收
		mem1 = rt.freeMemory();
		System.out.println("可用內存: "+ mem1);    //可用內存
	    for(int i=0; i<100; i++)//占用內存 someints[i] = new Integer(i); mem2 = rt.freeMemory(); System.out.println("可用內存: "+ mem2); //可用內存 System.out.println("使用的內存: "+ (mem1-mem2)); //用的內存 // discard Integers for(int i=0; i<100; i++) someints[i] = null; rt.gc(); //釋放內存 mem2 = rt.freeMemory(); System.out.println("可用內存 :" + mem2); //可用內存 //調用記事本程序 rt.exec("notepad"); System.out.println("Error executing notepad."); } }