String’s replace() takes either two chars or two CharSequences as arguments and it will replace all occurrences of char or String but replaceAll() method takes regex String as argument and replaces each substring of that matches given regex with replacement string.
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replaceAll() Method. The replaceAll() method is similar to the String. replaceFirst() method. The only difference between them is that it replaces the sub-string with the given string for all the occurrences present in the string .
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Java String replace(char old, char new) method example
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