java - 从字符串中删除除最后 n 个字符之外的所有字符

Question

我试图删除除最后 10 个字符之外的所有文本，但在 android 中出现错误

 09-15 16:22:58.146: E/AndroidRuntime(13630): java.lang.StringIndexOutOfBoundsException: length=228; index=263

但是当我在单独的类中尝试它时，它正在 java 上工作。这是我试过的？谁能告诉我关于 android 中的子字符串是否有任何问题？

String allchar = 
"PJGOGROG fnkmslkjsfsdmnsgdnklnsgklsgknlgrf jkghijgdlkjkgjdfkjgf kjlgdfkjlfdgfjklklj
kljfdkjlfkjldfdkjslkljdfskjlfsjkldfsjklkljs
fdsjklsdfkljsfdkljkhgfhhgdfsgkhdfskghfdskghfdsghsfdghafevbhfsvgydcgubcdmgycdgfehkhfeghjgh68
Alias12345";

    String  number = "";
    String reqtext = allchar.replaceAll("\\s+","");
    number = reqtext.substring(reqtext.length()-10 );
    System.out.println(number);

Answer 1

好吧，如果 substring() 不起作用，您可以尝试手动执行:

String allchar = 
"PJGOGROG fnkmslkjsfsdmnsgdnklnsgklsgknlgrf jkghijgdlkjkgjdfkjgf kjlgdfkjlfdgfjklklj
kljfdkjlfkjldfdkjslkljdfskjlfsjkldfsjklkljs
fdsjklsdfkljsfdkljkhgfhhgdfsgkhdfskghfdskghfdsghsfdghafevbhfsvgydcgubcdmgycdgfehkhfeghjgh68
Alias12345";

    StringBuilder number = new StringBuilder();
    String reqtext = allchar.replaceAll("\\s+","");
    for(int i = reqtext.length()-10; i < reqtext.length(); i++)
    {
        number.append(reqtext.charAt(i));
    }
    System.out.println(number.toString());