获取Java程序内存大小

public class Memory {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		long useMemory = (Runtime.getRuntime().totalMemory() - Runtime.getRuntime()
				.freeMemory()) / 1024;
		System.out.println("已用内存1: "
				+ useMemory + "KB");
		long[] use = new long[(65536-((int)useMemory))/8 * 1024];
		System.out.println("空闲内存: " + Runtime.getRuntime().freeMemory() / 1024
				+ "KB");
		System.out.println("已用内存2: "
				+ (Runtime.getRuntime().totalMemory() - Runtime.getRuntime()
						.freeMemory()) / 1024 + "KB");
		System.out.println("总内存: " + Runtime.getRuntime().totalMemory()/1024 + "KB");
	}

}