Intro Two Reduce Heap Memory Method For Java

Posted on Edited on In Views: Disqus: Symbols count in article: 631 Reading time ≈ 1 mins.

Intro Two Reduce Heap Memory Method For Java

這篇介紹Two Reduce Heap Memory Method For Java。

Example I

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Before:
double[][] arrays = new double[1000][1000];

for (int i = 0; i < 10000; i++) {
	for (int j = 0; j < 10000; j++) {
		double[][] temp = arrays[i][j];
	}
}

After:
double[][] arrays = new double[1000][1000];

for (int i = 0; i < 10000; i++) {
	double[] search = arrays[i];
	for (int j = 0; j < 10000; j++) {
		double[][] temp = search[j];
	}
}

Example II

1
2
3
4
5
6
7
8
9
10
11
12
13
Before:

for (int i = 0; i < 10000; i++) {
	double[] arrays = new double[10000];
}


After:
double[] arrays = new double[10000];

for (int i = 0; i < 10000; i++) {
	Arrays.fill(arrays, 0);
}