[英]How to extract data from a text file and write into CSV file in Java
[英]How to write data from an array into a text file?
我正在编写一个简单的程序,询问用户姓名,姓氏和年龄,然后将其保存到文本文件中,但是先前的数据将被删除。 我已经在阅读文本文件并可以显示它,但是无法将其写入文本文件。
这是我正在使用的代码:
import java.util.Scanner;
import java.io.*;
public class UserData{
public static void main (String args[]) throws IOException{
//Initialisations
Scanner scan = new
Scanner(System.in);
File UserData = new File(PATH OF FILE);
BufferedWriter b = new BufferedWriter(new FileWriter(UserData));
//Reader for Writer Old Data
String text[] = new String[10];
int count = 0;
String path = PATH OF FILE;
BufferedReader reader = new BufferedReader(new FileReader(path));
String line = null;
while ((line = reader.readLine()) != null){
text[count] = line;
count++;
}
PrintWriter pr = new PrintWriter(PATH OF FILE);
for (int I=0; I<text.length ; I++)
{
pr.println(text);
}
//Writer
System.out.println("Enter your name");
String name = scan.nextLine();
pr.println(name);
b.newLine();
System.out.println("Enter your surname");
String surname = scan.nextLine();
pr.println(surname);
b.newLine();
System.out.println("Enter your age");
int age = scan.nextInt();
pr.println(String.valueOf(age));
pr.close();
}
}
FileWriter类具有构造函数
public FileWriter(File file,
boolean append)
throws IOException
给定File对象,构造一个FileWriter对象。
在您的代码中-将第9行更改为
BufferedWriter b = new BufferedWriter(new FileWriter(UserData),true);
如果第二个参数为true,则字节将被写入文件的末尾而不是开头。
这是规范: 类FileWriter构造函数
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