J2me中实现StringTokenizer的功能

由于Java ME 中没有StringTokenizer，而我们又经常使用StringTokenizer的功能！而事实上,在rms的读取数据过程中经常会用到字符串的分割。这样没有办法！我们就只好编写一个类，代码如下:

ps:编译一下，然后引入编译器！写个实例！运行可见结果！但需注意此类中方法的使用！


import java.util.*;

public class StringTokenizer implements Enumeration
{

private void setMaxDelimChar()
{
if(delimiters == null)
{
maxDelimChar = '\0';
return;
}
char c = '\0';
for(int i = 0; i < delimiters.length(); i++)
{
char c1 = delimiters.charAt(i);
if(c < c1)
c = c1;
}

maxDelimChar = c;
}

public StringTokenizer(String s, String s1, boolean flag)
{
currentPosition = 0;
newPosition = -1;
delimsChanged = false;
str = s;
maxPosition = s.length();
delimiters = s1;
retDelims = flag;
setMaxDelimChar();
}

public StringTokenizer(String s, String s1)
{
this(s, s1, false);
}

public StringTokenizer(String s)
{
this(s, " \t\n\r\f", false);
}

private int skipDelimiters(int i)
{
if(delimiters == null)
throw new NullPointerException();
int j;
for(j = i; !retDelims && j < maxPosition; j++)
{
char c = str.charAt(j);
if(c > maxDelimChar || delimiters.indexOf(c) < 0)
break;
}

return j;
}

private int scanToken(int i)
{
int j;
for(j = i; j < maxPosition; j++)
{
char c = str.charAt(j);
if(c <= maxDelimChar && delimiters.indexOf(c) >= 0)
break;
}

if(retDelims && i == j)
{
char c1 = str.charAt(j);
if(c1 <= maxDelimChar && delimiters.indexOf(c1) >= 0)
j++;
}
return j;
}

public boolean hasMoreTokens()
{
newPosition = skipDelimiters(currentPosition);
return newPosition < maxPosition;
}

public String nextToken()
{
currentPosition = newPosition < 0 || delimsChanged ? skipDelimiters(currentPosition) : newPosition;
delimsChanged = false;
newPosition = -1;
if(currentPosition >= maxPosition)
{
throw new NoSuchElementException();
} else
{
int i = currentPosition;
currentPosition = scanToken(currentPosition);
return str.substring(i, currentPosition);
}
}

public String nextToken(String s)
{
delimiters = s;
delimsChanged = true;
setMaxDelimChar();
return nextToken();
}

public boolean hasMoreElements()
{
return hasMoreTokens();
}

public Object nextElement()
{
return nextToken();
}

public int countTokens()
{
int i = 0;
for(int j = currentPosition; j < maxPosition;)
{
j = skipDelimiters(j);
if(j >= maxPosition)
break;
j = scanToken(j);
i++;
}

return i;
}

private int currentPosition;
private int newPosition;
private int maxPosition;
private String str;
private String delimiters;
private boolean retDelims;
private boolean delimsChanged;
private char maxDelimChar;
}