Help on readLine()

Question

Dear
I am very new on the Java.
I get the problem that I can't solve it overnight.
I get the 3 errors. Please help and advise
Thanks alot.
javac AddStudent.java
AddStudent.java:13: unreported exception java.io.IOException; must be caught or
declared to be thrown
String ans = bf.readLine();
^
AddStudent.java:17: unreported exception java.io.IOException; must be caught or
declared to be thrown
ans = bf.readLine();
^
AddStudent.java:20: unreported exception java.io.IOException; must be caught or
declared to be thrown
ans = bf.readLine();
^
3 errors
import java.io.*;
import java.util.*;
public class AddStudent
     public void addStudent(Vector a)
          String tempId;
          String tempName;
          float tempGpa=0f;
          InputStreamReader is = new InputStreamReader (System.in);
          BufferedReader bf = new BufferedReader (is);
          System.out.print("Please enter the student number: ");
          String ans = bf.readLine();
          tempId = ans ;
          System.out.print("Please enter the student name: ");
          ans = bf.readLine();
          tempName = ans ;
          System.out.print("Please enter the GPA: ");
          ans = bf.readLine();
          tempGpa = Float.parseFloat(ans);

Answer 1

The reason - in java.io.BufferedReader the signature of the readLine is as follows:
public String readLine()throws IOException
It means that you have to make provisions if an exception occurs during reading.
The fix-
<code>
import java.io.*;
import java.util.*;
public class AddStudent
public void addStudent(Vector a)throws IOException{//Rough and ready solution - only to highlight the problem
String tempId;
String tempName;
float tempGpa=0f;
InputStreamReader is = new InputStreamReader (System.in);
BufferedReader bf = new BufferedReader (is);
System.out.print("Please enter the student number: ");
String ans = bf.readLine();
tempId = ans ;
System.out.print("Please enter the student name: ");
ans = bf.readLine();
tempName = ans ;
System.out.print("Please enter the GPA: ");
ans = bf.readLine();
tempGpa = Float.parseFloat(ans);
</code>
Ironluca :D