java - 替换和替换全部的区别

Question

这个问题已经有答案了:

Difference between String replace() and replaceAll() (13 个回答)

已关闭 9 年前。

replace 和有什么区别和replaceAll字符串的方法？

在以下示例中，代码给出 same输出。在这两种情况下all字符串的实例被替换。

String first = "Here is a cat There is a cat";
first = first.replace("cat", "dog"); 
System.out.println(first);

输出:

Here is a dog There is a dog

String second = "Here is a cat There is a cat";
second = second.replaceAll("cat", "dog"); 
System.out.println(second);

输出:

Here is a dog There is a dog

Answer 1

 String replace(CharSequence target, CharSequence replacement)

Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence.

String replaceAll(String regex, String replacement)

Replaces each substring of this string that matches the given regular expression with the given replacement.

来源:http://docs.oracle.com/javase/7/docs/api/java/lang/String.html