比较和更新一个字符串 [英] compare and update a string

问题描述

我试图找到一种方法，如何比较两个字符串并升级第一个，当第二个更多的时候。
例如

I am trying to find a way, how to compare two strings and upgrade the first, when the second has more in it. For example

String A="This is a statement!"; 
String B="This is a statement! Good luck!"; 
if(A<B{   //B has more letters
        //Upgrade A }
  else{ //Upgrade B
      }

我的意思是升级不会覆盖像A = B
我的字符串通常有很多行
我想保留字符串的值，只是从另一个String插入新的东西
有人有个想法吗？

I mean with upgrade not overwriting like A=B. My strings has usually much lines. I want to keep the value of the string and just insert the new things from the other String. Has someone an idea?

编辑：谢谢
不幸的是，我没有提供更清楚，对不起我的错。
我的问题是，我现在知道更改的位置，字符串可能如下所示：

Thank you for the nice answers. Unfortunetly I didnt exlain it more clear, sorry my fault. My problem is, that I do now know where the changes are, the strings could look like this:

String A: 
A 
B 
C//Good morning, sir 
D//A comment 
E


String B: 
A 
B//Yes 
C 
D 
DD 
E

The result should be: 
A 
B//Yes 
C//Good morning, sir 
D//A comment 
DD 
E

推荐答案

p>我想你需要这样的东西：

I guess you need something like this:

String A="This is a statement!"; 
String B="This is a statement! Good luck!";

if (A.length() < B.length()){   //B has more letters
        A += B.subString(A.length(), B.length()-1);
} else{ 
        B += A.subString(B.length(), A.length()-1);
}

希望这是你要找的：）。

Hope this is what you are looking for :).

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