java中如何获取CPU和内存的使用情况呢?

实现思路:
    借助Runtime类即可获取Java运行时的CPU及内存情况

package com.java265.other;
import java.text.NumberFormat;
public class Test11 {
	/**
	 * java265.com 示例演示
	 */
	public static void main(String[] args) {
		/** 获取JVM 内存及CPU运行情况的方法分享 */
		Runtime runtime = Runtime.getRuntime();

		NumberFormat format = NumberFormat.getInstance();
		StringBuilder sb = new StringBuilder();
		long maxMemory = runtime.maxMemory();
		long allocatedMemory = runtime.totalMemory();
		long freeMemory = runtime.freeMemory();

		sb.append("free memory: " + format.format(freeMemory / 1024) + "\n");
		sb.append("allocated memory: " + format.format(allocatedMemory / 1024) + "\n");
		sb.append("max memory: " + format.format(maxMemory / 1024) + "\n");
		sb.append("total free memory: " + format.format((freeMemory + (maxMemory - allocatedMemory)) / 1024) + "\n");

		System.out.println(sb);
	}
}

------运行以上代码，将输出以下信息----
free memory: 257,595
allocated memory: 260,096
max memory: 4,130,816
total free memory: 4,128,315