question on output

public static String longest(String str)
{
int p=0, longWl=0;
String longWord="";
str+=" ";

for(int i=0;i<?1?;i++)
{
if(?2?)
{
if(longWl<?3?)
{
longWl=str.substring(p,i).length();
longWord=?4?;
}
?5?
}
}
return longWord;
}
i) Find the statement/expression at ?1?, ?2?, ?3?, ?4?, ?5?.