删除Java中的一部分数组以释放堆中的内存 [英] Deleting Part of An Array in Java to Free Memory on Heap

问题描述

我正在为Java中的背包问题实现一个动态编程算法。我声明数组，然后将其大小初始化为[数量对象] [背包容量]。

I am implementing a dynamic programming algorithm for the knapsack problem in Java. I declare the array and then initialize its size to be [number of objects][capacity of knapsack].

当我的对象数量或我的容量变得太大时，由于堆空间不足而导致内存错误。我的问题是：如果我从我的double数组中删除行，Java会在我删除时释放内存吗？或者Java为我最初创建的数组的大小预留内存空间？如果是后者，有没有办法在Java中手动释放内存？

When my number of objects or my capacity gets too large, I get a memory error because I run out of space on the heap. My questions is: If I delete rows from my double array as I go along, will Java free the memory as I delete? Or does Java reserve that memory space for the size of the array I originally created? If it's the latter, is there a way to manually free the memory in Java?

感谢您的帮助！

解决方案

The short answer is "yes" - if you're using arrays like this:

$ c> private void foo（）{
int [] [] bar = new int [10] [10];
bar [1] = null;
//此时，bar [1]中的数组有资格进行垃圾回收
//除非其他人有引用
}

private void foo () { int[][] bar = new int[10][10]; bar[1] = null; //at this point, the array that was in bar[1] is eligible for garbage collection //unless someone else has a reference to it }

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