如何在 Java 中替换字符串中的字符? [英] How do I replace a character in a string in Java?

问题描述

使用 Java，我想遍历文本行并用 XML 实体引用 & 替换所有与符号 (&).

Using Java, I want to go through the lines of a text and replace all ampersand symbols (&) with the XML entity reference &.

我使用 Scanner 类扫描文本的行，然后扫描文本中的每个单词.然后我使用 CharacterIterator 来遍历单词的每个字符.但是，如何替换字符?首先，字符串是不可变的对象.其次，我想用几个字符(amp&;)替换一个字符(&).我应该如何处理这个问题?

I scan the lines of the text and then each word in the text with the Scanner class. Then I use the CharacterIterator to iterate over each characters of the word. However, how can I replace the character? First, Strings are immutable objects. Second, I want to replace a character (&) with several characters(amp&;). How should I approach this?

CharacterIterator it = new StringCharacterIterator(token);
for(char ch = it.first(); ch != CharacterIterator.DONE; ch = it.next()) {
       if(ch == '&') {

       }
}

推荐答案

尝试使用 String.replace() 或 String.replaceAll() 代替.

Try using String.replace() or String.replaceAll() instead.

String my_new_str = my_str.replace("&", "&");

(都替换所有出现的；replaceAll 允许使用正则表达式.)

(Both replace all occurrences; replaceAll allows use of regex.)

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