Question

JAVA中string.replace和string.replaceAll的区别及用法

Answer 1

java 中，没有区别
String str = "adcdeseded, dfsaf eed trttersdd";
System.out.println(str.replace("d", "="));
System.out.println(str.replaceAll("d", "="));
//输出结果a=c=ese=e=, =fsaf ee= trtters==

Answer 2

replace("old","new")：字符串中的旧字段只替换一次
replaceAll：字符串中包含的旧字段全部替换为新字段
示例：
String str = "AABBCCDDCCAACCHHHHHCC";
str = str.replace("CC","XX");
结果：AABBXXDDCCAACCHHHHHCC
str = str.replaceAll("CC","XX");
结果：AABBXXDDXXAAXXHHHHHXX