Posts Tagged file input

This example shows how to use scanner to read various type(like integer, double, boolean, string) of data from a file.

import java.util.*;

import java.lang.io.*;

class ScanMixed{

public static void main(String a[]) throws IOException {

int i;

double d;

boolean b;

String str;

//Write output to a file

FileWriter fout = new FileWriter("test.txt");

fout.write("Testing Scanner 10 12.2 one true two false");

fout.close();

FileReader fin= new FileReader("Test.txt");

Scanner src= new scanner(fin);

// Read to end.

while (src.hasNext()) {

if(src.hasNextInt()) {

i= src.nextInt();

System.out.println("int:  "+ i);

}

else if(src.hasNextDouble()) {

d= src.nextDouble ();

System.out.println("double: "+ d);

}

else if(src.hasNextBoolean()) {

b=src.nextBoolean();

System.out.println("boolean: "+b);

}

else {

str =src.next();

System.out.println("String: "+ str);

}

}

fin.close();

}

}