while

public int IndexOf(String elements ) {
pos = 0;
int result;
while (pos != e) {
pos++;

}
result = pos;
return result;
}



 do-while

public int indexOf(String elements){

pos = o;
do {
pos++;
}
while (pos != e);
result = pos;
return result;
}


for 

public int indexOf(String elements){

pos = 0;
for (pos = 0; pos =e ; pos ++)
result = pos;
return result;
}