java - 为什么我的代码不写入文本文件？

Question

我想知道为什么我的代码不写入文本文件，JVM 不抛出任何异常...

public class AlterData {

    Data[] information; 
    File informationFile = new File("/Users/RamanSB/Documents/JavaFiles/Information.txt");
    FileWriter fw;

    public void populateData(){
        information = new Data[3];

        information[0] = new Data("Big Chuckzino", "Custom House", 18);
        information[1] = new Data("Rodger Penrose", "14 Winston Lane", 19);
        information[2] = new Data("Jermaine Cole", "32 Forest Hill Drive", 30);
    }

    public void writeToFile(Data[] rawData){
        try{    
        fw = new FileWriter(informationFile);
        BufferedWriter bw = new BufferedWriter(fw);
        for(Data people : rawData){ 
            bw.write(people.getName()+ ", ");
            bw.write(people.getAddress() + ", ");
            bw.write(people.getAge() +", |");
            }
        }catch(IOException ex){
            ex.printStackTrace();
        }
    }

    public static void main(String[] args){
            AlterData a1 = new AlterData();
            a1.populateData();
            a1.writeToFile(a1.information); 
    }
}

Answer 1

尝试在写入数据后调用bw.flush()，然后在刷新后必须使用bw.close()关闭流。

关闭 BufferedWriter 时，最好将 close 语句放入 finally block 中，以确保无论如何都关闭流。

您还应该考虑使用资源尝试。这利用了 BufferedWriter 的 AutoCloseable 功能，如下所示:

try (BufferedWriter writer = new BufferedWriter(new FileWriter(new File("path/to/file")))) {
     // Do something with writer      
} catch (IOException e) {
     e.printStackTrace();
}

这样，无论发生什么情况，java 都会确保在离开 try 主体时关闭流。