Question

the following code is to read member, distance, and time from the file \workout.txt\, find the member with the greatest distance, and print the member and distance.

try{
scanner input = new scanner(new file(\workout.txt\));
string member = input.next();
int maxdis = / missing code a /;
double time = input.nextdouble();
while (input.hasnext())
{
string m = input.next();
int dis = input.nextint();
double t = / missing code b /;
if (maxdis < dis)
{
maxdis = dis;
member = m;
}
}
system.out.println(member + \ \ + time);
}
catch(ioexception e)
{
system.out.println(\couldnt open file\);
}

option 1:
a: input.next()
b: input.nextdouble()

option 2:
a: input.nextint()
b: input.nextdouble()

which is the correct option to replace the missing code?

• option 3
• option 1
• option 2

Explanation:

🆕 New Concept Discovered: File Parsing and Scanner Methods
Reading structured data sequentially using Scanner.

Step 1: Analyze the file structure and data types

The program reads data from a file named "workout.txt". Let's look at how the variables are declared and read initially:

1. String member = input.next(); reads the first member's name (a String).
2. int maxDis = / missing code A /; needs to read the first member's distance. Since maxDis is declared as an int, we must use a method that returns an integer.
3. double time = input.nextDouble(); reads the first member's time (a double).

This establishes that each record in the file consists of three parts in sequence:

$$\text{Member (String)} ightarrow \text{Distance (int)} ightarrow \text{Time (double)}$$

Therefore, for missing code A, we need to read an integer:
input.nextInt()

Step 2: Analyze the loop structure

Inside the while (input.hasNext()) loop, the program reads subsequent records in the same sequence:

1. String m = input.next(); reads the next member's name.
2. int dis = input.nextInt(); reads the next member's distance.
3. double t = / missing code B /; needs to read the next member's time. Since t is declared as a double, we must use a method that returns a double.

Therefore, for missing code B, we need to read a double:
input.nextDouble()

Step 3: Match with the given options

Let's look at the options listed at the bottom left of the image:

• Option 1:
• A: input.next()
• B: input.nextDouble()
• Option 2:
• A: input.nextInt()
• B: input.nextDouble()

Since missing code A must be input.nextInt() and missing code B must be input.nextDouble(), Option 2 is the correct choice.

Answer:

Option 2