Authors:
Walter Savitch ,kenrick Mock
Chapter:
File Io
Exercise:
Programming Projects
Question:8 | ISBN:9780132830317 | Edition: 5
Question
Write a program that will search a binary file of numbers of type int and write the largest and the smallest numbers to the screen. The file contains nothing but numbers of type int written to the file with writeInt.
Answer
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
public class TestDemo {
public static void main(String args[])
{
try
{
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream("writeIntFile.dat"));
System.out.println("Ten Random integer numbers are: ");
for (int i = 0; i < 10; i++)
{
int number = (int)(Math.random() * 20) + 1;
System.out.println(" " + number);
os.writeInt(number);
}
os.close();
ObjectInputStream is = new ObjectInputStream(new FileInputStream("writeIntFile.dat"));
int small = 20, large = 0;
try
{
while(true)
{
int nextInt = is.readInt();
if(nextInt < small)
small = nextInt;
if(nextInt > large)
large = nextInt;
}
}
catch (IOException e)
{
System.out.println("\nLargest number: " + large);
System.out.println("Smallest number: " + small);
}
}
catch(IOException e)
{
System.out.println("Error with file output.");
}
}
}
OUTPUT:
Ten Random integer numbers are:
12
7
20
11
6
5
20
16
20
18
Largest number: 20
Smallest number: 5