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        <dependency>
            <groupId>org.openjdk.jol</groupId>
            <artifactId>jol-core</artifactId>
            <version>0.9</version>
        </dependency>

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public class ObjectRAM {
    public static void main(String[] args) {
       
        System.out.println("**初始化Object**");
        Object o = new Object();
        System.out.println(ClassLayout.parseInstance(o).toPrintable());

        System.out.println("**初始化Object[]**");
        Object[] oa = new Object[15];
        System.out.println(ClassLayout.parseInstance(oa).toPrintable());
        
    }
}