编写一个截取字符串的函数的截取

    编程：编写一个截取字符串的函数，输入为一个字符串和字节数，输出为按字节截取的字符串。 但是要保证汉字不被截半个，如"我ABC"4，应该截为"我AB"，输入"我ABC汉DEF"，6，应该输出为"我ABC"而不是"我ABC+汉的半个".
class SplitString 
{ 
    String SplitStr; 
    int SplitByte; 
    public SplitString(String str,int bytes) 
    { 
        SplitStr=str; 
        SplitByte=bytes; 
        System.out.println("The String is:′"+SplitStr+"′;SplitBytes="+SplitByte); 
    } 
    public void SplitIt() 
    { 
        if(SplitByte>=2){
            byte [] splbyte=SplitStr.getBytes();
            int i=0;
            while(i<splbyte.length){
                String str=null;
                byte []tempbyte=new byte[SplitByte];
                for(int j=0;j<tempbyte.length;){
                    if(i<splbyte.length){
                        if(splbyte[i]>0){
                            tempbyte[j]=splbyte[i];
                            i++;
                            j++;
                        }else{
                            if(tempbyte.length-j==1){
                                j++;
                            }else{
                                tempbyte[j]=splbyte[i];
                                i++;
                                j++;
                                tempbyte[j]=splbyte[i];
                                i++;
                                j++;
                            }
                        }
                    }else{
                        break;
                    }
                }
                str=new String(tempbyte);
                System.out.println(str);
            }
        }else{
            System.out.println("输入参数不能小于2");
        }
    } 
    public static void main(String[] args) 
    { 
        SplitString ss = new SplitString("文dsf中kdjaa地0方0地0方l",6); 
        ss.SplitIt(); 
    } 
}