Question

愚蠢的问题，也许吧。但我尝试用每个新行填充512个整数的空文本文件。我能够将它们随机化并将它们写入文件中，但它们创造了我所希望的大量数字。任何人都可以帮我纠正我的代码吗？

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.*;

public class Randomizer {

      public static void main() {
        // The target file
        File out = new File("random.txt");
        FileWriter fw = null;
        int n = 512;
        // Try block: Most stream operations may throw IO exception
        try {
            // Create file writer object
            fw = new FileWriter(out);
            // Wrap the writer with buffered streams
            BufferedWriter writer = new BufferedWriter(fw);
            int line;
            Random random = new Random();
            while (n > 0) {
                // Randomize an integer and write it to the output file
                line = random.nextInt(1000);
                writer.write(line + "\n");
                n--;
            }
            // Close the stream
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
}

运行结束时random.txt的内容： 9463765593113665333437829621346187993554694651813319223268147794541131427390等。

Answer 1

            writer.write(line + "\n");

不要使用它。

您使用BufferedWriter而BufferedWriter使用.newLine()。

因此替换为：

writer.write(line);
writer.newLine();

Answer 2

您似乎在使用Windows - 在Unix / Windows / Classic Mac上，行结尾不同。

尝试\ r \ n用于基于Windows的系统，或者尝试在Wordpad中打开.txt文件而不是记事本 - \ n n通常在Unix系统上使用，并且Windows中包含的记事本应用程序已知不能很好地处理它们

Answer 3

从BufferedWriter newLine()查看此行：

提供了'\n'方法，该方法使用平台自己的行分隔符概念，由系统属性line.separator定义。并非所有平台都使用换行符（val parser = new scopt.OptionParser[Config]("scopt") { head("scopt", "3.x") opt[Int]('f', "foo") action { (x, c) => c.copy(foo = x) } text("foo is an integer property") opt[File]('o', "out") required() valueName("<file>") action { (x, c) => c.copy(out = x) } text("out is a required file property") opt[(String, Int)]("max") action { case ((k, v), c) => c.copy(libName = k, maxCount = v) } validate { x => if (x._2 > 0) success else failure("Value <max> must be >0") } keyValueName("<libname>", "<max>") text("maximum count for <libname>") opt[Seq[File]]('j', "jars") valueName("<jar1>,<jar2>...") action { (x,c) => c.copy(jars = x) } text("jars to include") opt[Map[String,String]]("kwargs") valueName("k1=v1,k2=v2...") action { (x, c) => c.copy(kwargs = x) } text("other arguments") opt[Unit]("verbose") action { (_, c) => c.copy(verbose = true) } text("verbose is a flag") opt[Unit]("debug") hidden() action { (_, c) => c.copy(debug = true) } text("this option is hidden in the usage text") note("some notes.\n") help("help") text("prints this usage text") arg[File]("<file>...") unbounded() optional() action { (x, c) => c.copy(files = c.files :+ x) } text("optional unbounded args") cmd("update") action { (_, c) => c.copy(mode = "update") } text("update is a command.") children( opt[Unit]("not-keepalive") abbr("nk") action { (_, c) => c.copy(keepalive = false) } text("disable keepalive"), opt[Boolean]("xyz") action { (x, c) => c.copy(xyz = x) } text("xyz is a boolean property"), checkConfig { c => if (c.keepalive && c.xyz) failure("xyz cannot keep alive") else success } ) }）来终止行。因此，调用此方法终止每个输出行是首选直接写入换行符。

在Java中创建一个用随机整数填充的文本文件

3 个答案: