您将获得一个文本文件(customer.txt),其中存储了客户的姓名,姓氏和年龄:
Ali Aslan 25
Ayse Demir 35
Ahmet Gemici 17 .
.
.
您应该处理此文件并查找以下每个范围的客户数量:
0 - 19
20 - 59
60 -
这是我的代码:
import java.io.*;
import java.util.*;
public class ass11 {
public static void main(String[] args) {
Scanner inputStream = null;
try {
inputStream = new Scanner(new FileInputStream("customer.txt"));
}
catch (FileNotFoundException e) {
System.out.println("file customer.txt not found");
System.exit(0);
}
int next, x = 0, y = 0, z = 0, sum = 0;
while(inputStream.hasNextInt()) {
next = inputStream.nextInt();
sum = sum + next;
if (next >= 60)
x++;
else if (next >= 19 && next <= 59)
y++;
else
z++;
}
inputStream.close();
System.out.println(x + " customer bigger than 60");
System.out.println(y + " customer between 19 and 59");
System.out.println(z + " customers smaller then 19");
}
}
它只读数字。当我为文本文件写一个名字和姓氏时,它不起作用,我不使用split()
方法......
答案 0 :(得分:1)
我建议使用原始文件进行测试:
Ali Aslan 25
Ayse Demir 35
Ahmet Gemici 17
每一行都是一个名字加上年龄,所以你会得到一个代码:
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("path/to/file" ), "UTF-8"));
String line;
while ((line = reader.readLine()) != null) {
String[] contents = line.split(" ");
// Assume contents is 3 long: name, surname, age
System.out.printf("%s %s is %d", contents[0], contents[1], Integer.parseInt(contents[2]));
}
是的,这确实使用了分割方法,这在我看来更容易。您也可以使用扫描程序通过next()
,next()
和nextInt()
答案 1 :(得分:0)
试试这段代码。它有效。
import java.io.BufferedReader;
import java.io.FileReader;
public class MyProject {
public static void main(String [] args){
String path = "C:/temp/stack/scores.txt";
processTextFile(path);
}
public static void processTextFile(String filePath) {
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(filePath));
String line = br.readLine();
String [] tokens = null;
int score = 0;
int x = 0;
int y = 0;
int z = 0;
while (line != null) {
tokens = line.split(" ");
score = Integer.parseInt(tokens[tokens.length -1]);
if(score >= 0 && score < 20){
x++;
}
if(score >= 20 && score < 60){
y++;
}
if(score > 60){
z++;
}
line = br.readLine();
}
if (br != null) {
br.close();
}
System.out.println("0-20 = " + x + ", 20-60 = " + y + ", 60+ = " + z);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}