程序为什么会出现这样的异常

[qishigang]

//用while语句复制字符串
public class WhileDemo
{
public static void main(String[] args)
{
String copyFromMe="Copy this string until you encounter the etter'g'.";
StringBuffer copyToMe=new StringBuffer();
int i=0;
char c=copyToMe.charAt(i);
while(c!='g')
{
copyToMe.append(c);
c=copyFromMe.charAt(++i);
}
System.out.println (copyToMe);
}
}



请各位看看这段代码，编译运行说是有异常，请教分析一下！！ 谢谢

[xiaxinhuo]

public class WhileDemo
{
public static void main(String[] args)
{
String copyFromMe="Copy this string until you encounter the etter'g'.";
StringBuffer copyToMe=new StringBuffer();
int i=0;
char c=copyFromMe.charAt(i);//是读取copyFromMe的一个字符
while(c!='g')
{
copyToMe.append(c);
c=copyFromMe.charAt(++i);
}
System.out.println (copyToMe);
}
}

[jienitainan]

public static void main(String[] args) {
String copyFromMe="Copy this string until you encounter the etter'g'.";
StringBuffer copyToMe=new StringBuffer();
int i=0;
char c=copyFromMe.charAt(i); //是读取copyFromMe
while(c!='g')
{
copyToMe.append(c);
c=copyFromMe.charAt(++i);
}
System.out.println (copyToMe);


}

犯这种错误!

[jsfhua]

什么异常？贴出来看

[dlxu]

char c=copyToMe.charAt(i);

这句错了吧，应该是char c=copyFromMe.charAt(i);

[TeaWater_2008]

public class WhileDemo
{
public static void main(String[] args)
{
String copyFromMe="Copy this string until you encounter the etter'g'.";
StringBuffer copyToMe=new StringBuffer();
int i=0;
char c=copyToMe.charAt(i);//NOT copyToMe BUT copyFromMe
while(c!='g')
{
copyToMe.append(c);
c=copyFromMe.charAt(++i);
}
System.out.println (copyToMe);
}
}

[Areslp]

呵呵，碰到string里的g就会终止了。。