编程：编写一个截取字符串的函数，输入一个字符串和字节数，输出按字节书截取的字符串，但是要保证汉字不能截半个，，如“我ABC”，4 应该截取“我AB”，输入“我ABC汉DEF”，6 然后输出“我ABC”，而不是半个汗字；
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周五下午做的面试题，回来一直在想！大家帮我看看，顺便带上方法注释！
------解决方案--------------------
我在别的地方找了一段代码
public static String substring(String str, int toCount,String more)
{
int reInt = 0;
String reStr = "";
if (str == null)
return "";
char[] tempChar = str.toCharArray();
for (int kk = 0; (kk < tempChar.length && toCount > reInt); kk++)
{
String s1 = str.valueOf(tempChar[kk]);
System.out.print(s1);
byte[] b = s1.getBytes();
reInt += b.length;
reStr += tempChar[kk];
}
if (toCount == reInt || (toCount == reInt - 1))
reStr += more;
return reStr;
}
------解决方案--------------------
public static string SubstringByByte(string str, int byteLength)
{
char[] strs = str.ToCharArray();
string strings = null;
if (byteLength == 0)
return strings;
foreach (char temp in strs)
{
byte[] bytes = Encoding.UTF8.GetBytes(temp.ToString());
strings += temp.ToString();
byteLength = byteLength - bytes.Length;
if (byteLength <= 0)
break;
}
return strings;
}
虽然有点麻烦，不过好像能行
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- C# code
//用C#实现一个： static string GetSubString(string str, int byteCount) { int count = 0; string result = string.Empty; foreach (char ch in str) { count += System.Text.Encoding.Default.GetByteCount(ch.ToString()); if (count > byteCount) break; result += ch.ToString(); } return result; } static void Main(string[] args)//调用 { string str = "我ABC汉DEF"; for (int i = 1; i < 10; i++) { Console.WriteLine("截出"+i+"个字节："); Console.WriteLine(GetSubString(str, i)); } }/*输出结果：截出1个字节：截出2个字节：我截出3个字节：我A截出4个字节：我AB截出5个字节：我ABC截出6个字节：我ABC截出7个字节：我ABC汉截出8个字节：我ABC汉D截出9个字节：我ABC汉DE*/
------解决方案--------------------
public class Test {
/**
* @param args
*/
public void output(int count,String str)
{
int index=0;
boolean flag=false;
for(int i=0;i<str.length()&& index<count;i++)
{
char c=str.charAt(i);
if(c>=0 && c<=255)
{
flag=true;
index++;
System.out.println(c);
}
if(flag==false)
{
index+=2;
if(index<=count)System.out.println(c);
}
flag=false;
}
}
public static void main(String[] args) {
Test t=new Test();
t.output(6,"ab@毕AKDJSD");
}
}