In Java, what is the best way to determine the size of an object?中给出了一个很好的答案。

首先，将下面的类编译并放入jar中：

import java.lang.instrument.Instrumentation;

public class ObjectSizeFetcher {

private static Instrumentation instrumentation;

public static void premain(String args, Instrumentation inst) {

instrumentation = inst;

public static long getObjectSize(Object o) {

return instrumentation.getObjectSize(o);

在MANIFEST.MF中添加如下内容：

Premain-Class: ObjectSizeFetcher

然后，我们就可以在main函数中尝试获取对象占用的内存大小了：

public class C {

private int x;

private int y;

public static void main(String [] args) {

System.out.println(ObjectSizeFetcher.getObjectSize(new C()));

将上面的代码打包成jar后，执行：</

在In Java, what is the best way to determine the size of an object?中给出了一个很好的答案。首先，将下面的类编译并放入jar中：import java.lang.instrument.Instrumentation;public class ObjectSizeFetcher {private static Instrumentati...