如何查找的內存量在RAM中使用的Java

Question

我想這應該打印

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

Answer 1

使用下面的代碼

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); 

Answer 2

有下面的印刷方法所使用的內存的代碼方法來計算

**total memory and free-memory**

在運行時。

class temp 
    { 
    public static void main(String args[]) 
    { 
    Runtime rt = Runtime.getRuntime(); 


    System.out.println(rt.totalMemory()); 
    System.out.println(rt.freeMemory()); 
    System.out.println(rt.totalMemory() - rt.freeMemory()); 
    }}