stringbuilder可以容纳的最大字符数 [英] Maximum number of characters stringbuilder can accommodate

问题描述

我需要写10,000 x 30,000个字符.单个stringbuilder能否兼容所有字符，还是我应该考虑一个stringbuilder数组?我没有访问测试用例的权限，因此我无法亲自验证它.希望我能在这里找到答案.

I need to write 10,000 x 30,000 characters. will a single stringbuilder be able to acomodate all characters or should I think of an array of stringbuilders? I do not have access to the test cases, so I cannot actually verify it myself. Hope I will find the answer here.

谢谢.

我尝试使用循环添加10000 x 30000个字符.我遇到以下异常.

I tried to add 10000 x 30000 characters using a loop. I get the following exceptions.

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2367)
at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)
at java.lang.StringBuilder.append(StringBuilder.java:132)
at Test.main(Test.java:19)

该"java堆空间"怎么办?

What to do with this "java heap space"?

推荐答案

该长度是一个整数，因此如果您有内存，则它最多可容纳2GChar(4GB).您将使用仅" 600MB(3亿个@每个字符2个字节).请小心，最终要制作多少个副本...即toString().

The length is an int so it should hold up to 2GChar (4GB) assuming you have the memory. You are going to use "only" 600MB (300 million @ 2 bytes per character). Just be careful how many copies you end up making... i.e. toString().

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