[英]Read numbers from file in java
I'm sorry for the other post here is my code: It works, it prints the text file but i don't know how to separate the first row from the others. 对于另一个帖子,我很抱歉,这是我的代码:它可以工作,可以打印文本文件,但是我不知道如何将第一行与其他行分开。 I mean that I want to save the values from the first row into 2 variables and then process the remaining lines.
我的意思是我想将第一行中的值保存到2个变量中,然后处理剩余的行。
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class read {
public static void main (String[] args) throws IOException
{
String scan;
FileReader file = new FileReader("C:\\Users\\W7\\workspace\\SimpleGraph(01-10-13)\\numbers.txt");
BufferedReader br = new BufferedReader(file);
while((scan = br.readLine()) != null)
{
System.out.println(scan);
}
br.close();
}
}
Just read the first line separated and then iterate over the rest of the file. 只需读取分隔的第一行,然后遍历文件的其余部分。 EDIT: You can split your String into an array and read your Integers like this:
编辑:您可以将您的字符串拆分成一个数组,然后读取您的整数,如下所示:
String scan;
FileReader file = new FileReader("C:\\Users\\W7\\workspace\\SimpleGraph(01-10-13)\\numbers.txt");
BufferedReader br = new BufferedReader(file);
String first = br.readLine();
if ( null != first) {
System.out.println("First is: " + first);
String[] numberStrings = first.split(" ");
int[] numbers = new int[numberStrings.length];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = Integer.parseInt(numberStrings[i]);
System.out.println("Number " + i + " is " + numbers[i]);
}
while((scan = br.readLine()) != null) {
System.out.println(scan);
}
}
br.close();
Try this 尝试这个
public static void main(String[] args) throws IOException {
String scan;
FileReader file = new FileReader("C:\\Users\\W7\\workspace\\SimpleGraph(01-10-13)\\numbers.txt");
BufferedReader br = new BufferedReader(file);
boolean isFirstLine = true;
int forstNo = 0;
while ((scan = br.readLine()) != null) {
if(isFirstLine){
forstNo = Integer.parseInt(scan);
isFirstLine = false;
}
System.out.println(scan);
}
br.close();
System.out.println("first no "+forstNo);
}
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