本文介绍了Java：PrintWriter的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试使用 PrintWriter.java ，但我遇到了一个相当奇怪的问题，我无法弄清楚我在这里缺少什么。
I am trying to use PrintWriter.java but I am getting a rather strange problem and I am not able to figure out what am I am missing here.
MyPrintWriter.java
public class MyPrintWriter {
public static void main(String[] args) {
File myFile = new File("myFileDirectory/myFileName.txt");
try {
FileWriter fw = new FileWriter(myFile);
PrintWriter pw = new PrintWriter(fw);
pw.println("Hello World!");
pw.close();
} catch (FileNotFoundException e) {
System.err.println("File not found: " + myFile);
} catch (Exception e) {
e.printStackTrace();
}
}
}
MyFileWriter.java
public class MyFileWriter {
public static void main(String[] args) {
File myFile = new File("myFileDirectory/myFileName.txt");
try {
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(isr);
FileWriter fw = new FileWriter(myFile);
PrintWriter pw = new PrintWriter(fw);
String input;
input = br.readLine();
while(input != null) {
pw.println(input);
input = br.readLine();
}
br.close();
pw.close();
} catch (FileNotFoundException e) {
System.err.println("File not found: " + myFile);
} catch (Exception e) {
e.printStackTrace();
}
}
}
MyPrintWriter.java 被愉快地写入的 myFileName.txt 文件但不能
MyPrintWriter.java is happily writing to the myFileName.txt file but MyFileWrite.java can't.
有人可以帮我理解我在这里缺少什么吗？
Could someone help me understand what am I missing here?
推荐答案
你可能需要您的印刷作家。
You probably need to flush your print writer.
在创建一个带有 autoFlush 设置为关闭
The PrintWriter constructor with a FileWriter parameter creates a PrintWriter with autoFlush set to off
调用 pw.flush（）在 pw.close（）; 之前应该这样做
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