我正在编写一个代码,用于检查数字是否为素数,如果是,则将其打印在文件中,但是当我打开InputStream时,它会自动删除我文件中的内容! 这是我的代码
import java.util.Scanner;
import java.io.*;
@SuppressWarnings("all")
public class PrimeList {
public static void main(String[]args) throws NumberFormatException, IOException {
String name = "C:\\Text\\primelist.txt";
File file = new File(name);
try {
OutputStreamWriter wr = new OutputStreamWriter(new FileOutputStream(file));
BigInteger bi = BigInteger.valueOf(5);
BigInteger zero = BigInteger.ZERO;
BigInteger two = BigInteger.valueOf(2);
while(true) {
BufferedReader read = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
while(true) {
BigInteger prime = BigInteger.valueOf(Long.parseLong(read.readLine()));
有谁能告诉我如何解决这个问题?
答案 0 :(得分:2)
因为你这样做
BufferedReader read = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
每次调用方法
时,都在创建新的FileInputStream(文件)答案 1 :(得分:2)
new FileOutputStream(file, true)
。
'真正的'意味着追加'。