还是replaceFirst的问题

Question

你可以这样写:fuzhifenxizhantoken[fz-1]+" "+"\\"+fuzhifenxizhantoken[fz]+" "+fuzhifenxizhantoken[fz+1]

Answer 1

少了点,这样可以的fuzhifenxizhantoken[fz-1]+" "+"\\\\"+fuzhifenxizhantoken[fz]+" "+"\\"+fuzhifenxizhantoken[fz+1]

Answer 2

能告诉我
1.fuzhifenxizhantoken[fz]前面为什么要加四个"\\\\"? 
2."("也要转意吗?

Answer 3

是的（要转意
        String[] fuzhifenxizhantoken = new String[4];
        fuzhifenxizhantoken[0] = "b";
        fuzhifenxizhantoken[1] = "F";
        fuzhifenxizhantoken[2] = "*";
        fuzhifenxizhantoken[3] = "(";
        String fuzhifenxizhan = "# F * ( F - F )";
for(int L=0;L<fuzhifenxizhantoken.length;L++)
{
if(fuzhifenxizhantoken[L].equals("+"))
{
fuzhifenxizhantoken[L]="\\+";//转意
}
if(fuzhifenxizhantoken[L].equals("*"))
{
fuzhifenxizhantoken[L]="\\*";//转意
}
if(fuzhifenxizhantoken[L].equals("("))
{
fuzhifenxizhantoken[L]="\\(";//转意
}
}     
int fz = 2;
System.out.println(fuzhifenxizhantoken[fz-1]+" "+fuzhifenxizhantoken[fz]+" "+fuzhifenxizhantoken[fz+1]);
fuzhifenxizhan=fuzhifenxizhan.replaceFirst(fuzhifenxizhantoken[fz-1]+" "+fuzhifenxizhantoken[fz]+" "+fuzhifenxizhantoken[fz+1],"T");

System.out.println(fuzhifenxizhan);