java - 无法在java中关闭我的DataInputStream和DataOutputStream

Question

我最近开始学习java中的文件处理。但是，在这段代码(如下)中，我试图在所有读写结束时关闭文件，但这样做时遇到错误。

package trycatch;

import java.util.Scanner;
import org.omg.CORBA.DataInputStream;

import java.*;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Writer;

public class Source {

public static void main(String[] args) throws Exception {

    Scanner input = new Scanner(System.in);
    try {
    File f = new File("record.txt");

    FileOutputStream writing = new FileOutputStream(f);
    DataOutputStream write = new DataOutputStream(writing);
    write.writeUTF("What are the things that you want to do");

    String str;

    FileInputStream reading = new FileInputStream(f);
    java.io.DataInputStream read = new java.io.DataInputStream(reading);
    str = read.readUTF();
    System.out.println(str);
    }
    catch(FileNotFoundException e) {

        System.out.println("The system collapsed");
    }
    finally {
        write.close(); // write cannot be resolved
        read.close();  // read cannot be resolved
    }

    input.close();
}
}

我正在尝试使用 finally 关键字，但是您能告诉我为什么当我在那里写入时，我的 IDE 无法识别读取和写入吗？

write cannot be resolved

Answer 1

你的读写字段对于try block 来说是本地的，finally无法访问then。在try之外初始化它。