freeMemory（）和totalMemory（）之间的区别

Question

freeMemory()和totalMemory()有什么区别？两者都是JVM当前可用的内存总量。

    /**
     *
     * @return  an approximation to the total amount of memory currently
     *          available for future allocated objects, measured in bytes.
     */
    public native long freeMemory();

    /**
     *
     * @return  the total amount of memory currently available for current
     *          and future objects, measured in bytes.
     */
    public native long totalMemory();

Answer 1

freeMemory()说for future，而totalMemory()说for current and future。

从字面上看，freeMemory()告诉新分配对象的内存，totalMemory()告诉总内存（已分配的内存+可用内存）