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File size: 2,267 Bytes
150962c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | nextLine() - returns String
valueOf() - Integer OR Double
===================================================================
import java.util.Arrays;
public class Example {
public static void main(String[] args){
String str = "first,second,third";
String[] chunks = str.split(",");
//print array - [first, second, third]
System.out.println(Arrays.toString(chunks));
//print string elements
for (String chunk : chunks) {
System.out.println(chunk);
}
String sentence ="This is a sentence with many words";
String[] words = sentence.split(" ");
System.out.println(Arrays.toString(words));
for (String word : words) {
System.out.println(word);
}
}
}
Program outputs:
[first, second, third]
first
second
third
[This, is, a, sentence, with, many, words]
This
is
a
sentence
with
many
words
===================================================================
eg
luvut/numbers.csv
1,4,3,5,2,4,5,2
4,5,11,2,4,2,5,4,3
6,7,5,2,3,3,2,4,6
8,7,4,5,4,3,3,2,1
0,0,2,4,2,0,2,5,3
reads the file
decomposes each line into chunks,
converts the chunks to integers and
finally calculates the sum of the numbers:
import java.io.FileNotFoundException;
import java.io.File;
import java.util.Scanner;
public class Example {
public static void main(String[] args){
File file = new File("luvut.csv");
// read the file
try(Scanner reader = new Scanner(file)) {
int sum = 0;
while (reader.hasNextLine()) {
// process line by line
String row = reader.nextLine();
// split into an array of number strings
String[] chunks = row.split(",");
// parse each number string as Integer
for (String chunk : chunks) {
int num = Integer.valueOf(chunk);
sum += num;
}
}
System.out.println("Sum of the numbers: " + sum);
}
catch (FileNotFoundException e) {
System.out.println("Error: " + e.getMessage());
}
}
}
Program outputs:
Sum of the numbers: 159
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