高分悬赏：Java语言字符串怎么做减法？比如

Question

高分悬赏：Java语言字符串怎么做减法？比如
abcdefg - defg = abc
aaaaaa - a = aaaaa
abbbbbb - a = bbbbbb

Answer 1

代码如下:

str1="abcd";
str2="cd";
str3=str1.replaceAll(str2,"");
//str3="ab"