[紧急]： 请高手指点，如何把String 或者 StringBuffer里面的中文字符提取出来！在线等待，分不够可再给！

Question

我觉得如果你只是要去掉英文字符的话
那判断String里面的每一个char
是否处在a~z  A~Z之间
如果在这些之间就去掉
你觉得这样如何?

Answer 1

File file = new File("d:/websrc/aaa.txt");                         
BufferedReader reader = new BufferedReader(new FileReader(file));  
StringBuffer strBuffer = new StringBuffer();                       
String temp = null;                                                
while((temp=reader.readLine())!=null){                             
strBuffer.append(temp);                                        
}                                                                  
                                                                   
String str = new String();                                         
for(int i='a';i<='z';i++){                                         
str.replaceAll(String.valueOf((char)i),"");                    
}                                                                  
                                                                   
for(int i='A';i<='Z';i++){                                         
str.replaceAll(String.valueOf((char)i),"");                    
}                                                                  
System.out.println(str);                                           
                                                                   

Answer 2

如果要用正则表达式的话
用这一句就行了
str = str.replaceAll( "[a-zA-Z]", "" );