Question

programming with data files

public class scannerstuff
{
public static void main(string args)
{
try
{
scanner input = new scanner(new file(\colleges.txt\));

while (input.hasnext())
{
string name = / missing code a /;
int numstu = / missing code b /;
int tuition = input.nextint();
input.nextline();

system.out.println(name + \ \ + numstu + \ \ + tuition);
}
}
catch(ioexception e)
{
system.out.println();
}
}
}

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

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

option 3:
a: input.nextline()
b: input.nextint()

Explanation:

🆕 New Concept Discovered: Java Scanner Token Parsing
Reading text and numeric data sequentially from a file.

Step 1: Analyze the Variable Types

We need to fill in the missing code for two variables:

1. String name = / missing code A /
2. int numStu = / missing code B /

The third variable is already provided:
int tuition = input.nextInt();

Step 2: Determine the Correct Scanner Methods

• For name (String): We need to read a text value. The standard Scanner method to read the next single-word string token is input.next().
• For numStu (int): We need to read an integer value. The standard Scanner method to read the next integer token is input.nextInt().

Let's look at the options provided in the image:

• Option 1:
• A: input.next()
• B: input.next() (Incorrect, because numStu is declared as an int, so it requires an integer-parsing method like nextInt()).

• Option 2:
• A: input.nextInt() (Incorrect, because name is a String).
• B: input.nextInt()

• Option 3:
• A: input.nextLine()
• B: input.nextInt()

Since input.next() is not paired with input.nextInt() in any option, let's look closely at Option 3.
If a college name contains spaces (e.g., "State University"), input.nextLine() is used to read the entire line as a String for name. Then, the next line contains the integer numStu, which is read using input.nextInt(). This matches the variable types perfectly:

• name gets a String via input.nextLine()
• numStu gets an int via input.nextInt()

Answer:

Option 3