Question

StringBuilder隐藏元音：

String bienvenue_intro = " Welcome! Java First Semester: 455, java street: City (State): Country: 575757 ";
StringBuilder sb = new StringBuilder(bienvenue_intro);
String[] introduction = bienvenue_intro.split(":"); 
for (int i = 0; i < bienvenue_intro.length(); i++) {
    char c = bienvenue_intro.charAt(i);
    if ((c == 'A') || (c == 'a') ||
        (c == 'E') || (c == 'e') ||
        (c == 'I') || (c == 'i') ||
        (c == 'O') || (c == 'o') ||
        (c == 'U') || (c == 'u')) {
            sb.setCharAt(i, '*');
    }
}
System.out.println(bienvenue_intro);
System.out.println(sb.toString());

上述代码的输出是：

Welcome! Java First Semester: 455, java street: City (State): Country: 575757 
 W*lc*m*! J*v* F*rst S*m*st*r: 455, j*v* str**t: C*ty (St*t*): C**ntry: 575757

方法拆分以打破行：

for (int i = 0; i < introduction.length; i++)
    System.out.println(introduction[i]);

使用split + string builder所需的输出是：

W*lc*m*! J*v* F*rst S*m*st*r

 455, j*v* str**t

 C*ty (St*t*)

 C**ntry

 575757

但两者在一起它不起作用！甚至可以使用Split方法将StringBuilder组合在一起吗？

Answer 1

不要先拆分String，先拆分转换。 StringBuilder将为您执行就地字符替换，并使用toString()获取替换的字符串并对其执行拆分。

String bienvenue_intro = " Welcome! Java First Semester: 455, java street: City (State): Country: 575757 ";
StringBuilder sb = new StringBuilder(bienvenue_intro);

for (int i = 0; i < bienvenue_intro.length(); i++) {
  char c = bienvenue_intro.charAt(i);
  if (   (c == 'A') || (c == 'a')
      || (c == 'E') || (c == 'e')
      || (c == 'I') || (c == 'i')
      || (c == 'O') || (c == 'o')
      || (c == 'U') || (c == 'u')) {
    sb.setCharAt(i, '*');
  }
}
System.out.println(bienvenue_intro);
//System.out.println(sb.toString());

String[] introduction = sb.toString().split(":");  //<-- Do the split here after replacements.
for (String string : introduction) {
  System.out.println(string);
}

输出：

 W*lc*m*! J*v* F*rst S*m*st*r
 455, j*v* str**t
 C*ty (St*t*)
 C**ntry
 575757

Answer 2

有一种更好，更简单的方法：）

replaceAll()和split()。

public static void main(String[] args) {
    String bienvenue_intro = " Welcome! Java First Semester: 455, java street: City (State): Country: 575757 ";
    String[] arr = bienvenue_intro.replaceAll("(?i)[aeiou]+", "*").split(":");

    for(String s : arr) {
        System.out.println(s);
    }
}

 W*lc*m*! J*v* F*rst S*m*st*r
 455, j*v* str*t
 C*ty (St*t*)
 C*ntry
 575757

Answer 3

我想扩展@YoungHobbit给出的答案。我不是专家，但这些是我的观察：

无需使用StringBuilder。在此处阅读更多内容：when to use StringBuilder in java
您可以使用正则表达式进行转换。在此处阅读更多内容：How to replace replace vowels with a special character in Java?

我的看法：

String bienvenue_intro = " Welcome! Java First Semester: 455, java street: City (State): Country: 575757 ";
String mod_str = bienvenue_intro.replaceAll( "(?i)[aeiou]", "*" );
String[] introduction = mod_str.split(":");
for (String string : introduction) {
  System.out.println(string);
}

Answer 4

我相信你的方法是错的：已经有一个API可以在一个易于阅读的代码行中执行此操作：

System.out.println(bienvenue_intro.replaceAll("[aeiouAEIOU]", "*").replace(":", "\n"));

如何在同一个类中将splitbuilder与splitbuilder一起使用？

4 个答案: