java - java中如何查看RAM中使用了多少内存

Question

我想要打印以下打印方法中使用的内存的代码

import java.*.*;
     public static void main(String[] args)
    {
    System.out.println('The memory used is');
    }

Answer 1

使用下面的代码

float mb = 1024*1024; 
    //Getting the runtime reference from system
    Runtime runtime = Runtime.getRuntime();

    System.out.println("##### Heap utilization statistics [MB] #####");

    //Print used memory
    System.out.println("Used Memory:"+ (runtime.totalMemory() - runtime.freeMemory()) / mb);

    //Print free memory
    System.out.println("Free Memory:"+ runtime.freeMemory() / mb);

    //Print total available memory
    System.out.println("Total Memory:" + runtime.totalMemory() / mb);

    //Print Maximum available memory
    System.out.println("Max Memory:" + runtime.maxMemory() / mb);