当尝试打印 2 到 1000 之间的质数时，PrintWriter 在文本文件中写入一些其他字符

Question

I'm trying to print prime numbers between 2 and 1000 but it is writing some other characters in text file

Here is the contents of my TreeSet:

[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89,
97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181,
191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397,
401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619,
631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743,
751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863,
877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997]

Here is snippets of my code retrieving and printing the above prime numbers into the text file "PrimeNumbersList.txt":

        pw = new PrintWriter("PrimeNumbersList.txt");
        int count = 0;
        for(Long l: treeSet){
            if(count==0){
                pw.print(""+l);
                pw.flush();
                count++;
                continue;
            }
            pw.print("\n"+l);
            pw.flush();
        }

Expected output:

2
3
5
.
.
.
997

The output I got:

ਲਲ਼ਵ਷ㄱㄊਲ਼㜱ㄊਹ㌲㈊ਹㄳ㌊਷ㄴ㐊ਲ਼㜴㔊ਲ਼㤵㘊਱㜶㜊਱㌷㜊ਹ㌸㠊ਹ㜹ㄊ㄰ㄊ㌰ㄊ㜰ㄊ㤰ㄊ㌱ㄊ㜲ㄊㄳㄊ㜳ㄊ㤳ㄊ㤴ㄊㄵㄊ
㜵ㄊ㌶ㄊ㜶ㄊ㌷ㄊ㤷ㄊㄸㄊㄹㄊ㌹ㄊ㜹ㄊ㤹㈊ㄱ㈊㌲㈊㜲㈊㤲㈊㌳㈊㤳㈊ㄴ㈊ㄵ㈊㜵㈊㌶㈊㤶㈊ㄷ㈊㜷㈊ㄸ㈊㌸㈊㌹㌊㜰㌊
ㄱ㌊㌱㌊㜱㌊ㄳ㌊㜳㌊㜴㌊㤴㌊㌵㌊㤵㌊㜶㌊㌷㌊㤷㌊㌸㌊㤸㌊㜹㐊㄰㐊㤰㐊㤱㐊ㄲ㐊ㄳ㐊㌳㐊㤳㐊㌴㐊㤴㐊㜵㐊ㄶ㐊㌶㐊
㜶㐊㤷㐊㜸㐊ㄹ㐊㤹㔊㌰㔊㤰㔊ㄲ㔊㌲㔊ㄴ㔊㜴㔊㜵㔊㌶㔊㤶㔊ㄷ㔊㜷㔊㜸㔊㌹㔊㤹㘊㄰㘊㜰㘊㌱㘊㜱㘊㤱㘊ㄳ㘊ㄴ㘊㌴㘊
㜴㘊㌵㘊㤵㘊ㄶ㘊㌷㘊㜷㘊㌸㘊ㄹ㜊㄰㜊㤰㜊㤱㜊㜲㜊㌳㜊㤳㜊㌴㜊ㄵ㜊㜵㜊ㄶ㜊㤶㜊㌷㜊㜸㜊㜹㠊㤰㠊ㄱ㠊ㄲ㠊㌲㠊㜲㠊
㤲㠊㤳㠊㌵㠊㜵㠊㤵㠊㌶㠊㜷㠊ㄸ㠊㌸㠊㜸㤊㜰㤊ㄱ㤊㤱㤊㤲㤊㜳㤊ㄴ㤊㜴㤊㌵㤊㜶㤊ㄷ㤊㜷㤊㌸㤊ㄹ㤊㜹

Answer 1

Try it like this.

• specify a character set. Here I chose the default.
• use try with resources to both catch an exception and close the file.
• use println to print a line terminator after each value.
• the auto closing of the file will flush the output buffer.

try (PrintWriter pw = new PrintWriter("f:/PrimeNumbersList.txt",
          Charset.defaultCharset())) {
         
         for(long l: longs){
             pw.println(l);
         }
} catch (IOException ioe){
    ioe.printStackTrace();
}

The above printed the values, one per line, in the target file.