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SCJP Module-6 Question-3

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The program given below will test your knowledge about float data types in Java.

Given below the sample code :

1  public class SuperClass {
2  public static void main(String[] args) {
3  System.out.println(stringConvert("0.3"));
4  System.out.println(stringConvert("0.3A"));
5  System.out.println(stringConvert(null));}
6  public static boolean stringConvert(String s) {
7  float factor = 0;
8  try {
9  factor = Float.valueOf(s).floatValue();
10 return true;
11 } catch (NumberFormatException e) {
12 System.out.println("Exception in number formatting " + s);
13 factor = Float.NaN;
14 } finally {
15 System.out.println("Finally");
16 }
17 return false;}
18 }

How can we correct the above code ?

1. By removing line 5

2. By removing  line 4

3. No need for correction

4. by removing line 3

Answer :

(1)

Explanation :

 The error due to "0.3A" is caught  by the "catch" but the "null" at line 5 cause error in string conversion.

 

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