我有以下代碼片段將文本文件的全部內容讀入字符串.它有效,唯一的問題是……它真的很慢(文件長約1500行).

InputStream is = this.getResources().openRawResource(R.raw.comp_rules_glossary);

BufferedReader br = new BufferedReader(new InputStreamReader(is));

String previousLine = "start";

while ((readLine = br.readLine()) != null)

{

rules = rules + readLine + eol;

if (previousLine.equals(""))

{

content = content + readLine + eol;

}

previousLine = readLine;

}

is.close();

br.close();

目前,我正在一次讀取一行中的完整文件,然后將其附加到字符串中.有更快的方法嗎？我正在尋找一種快速的方法將整個文件放入字符串中.

解決方法:

StringBuilder sb_rules = new StringBuilder();

StringBuilder sb_content = new StringBuilder();

while ((readLine = br.readLine()) != null)

{

sb_rules.append(readLine);

sb_rules.append(eol);

if (previousLine.equals(""))

{

sb_content.append(readLine);

sb_content.append(eol);

}

previousLine = readLine;

}

content = sb_rules.toString();

content = sb_content.toString();

String does not allow appending. Each method you invoke on a String creates a new object and returns it. This is because String is immutable – it cannot change its internal state.

標簽：java,file,android,bufferedreader,performance

來源： https://codeday.me/bug/20190621/1253193.html

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