Java 我的程序没有';不要打开文本文件来读取它
Java 我的程序没有';不要打开文本文件来读取它,java,Java,course.txt文件未被我的代码读取。它允许我输入文件名,但不打开文件 package javaexam; import java.io.*; import java.util.ArrayList; import java.util.HashMap; import java.io.BufferedReader; import java.util.Scanner; public class BufferReader { public static void main(String[
course.txt
文件未被我的代码读取。它允许我输入文件名,但不打开文件
package javaexam;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.io.BufferedReader;
import java.util.Scanner;
public class BufferReader {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
BufferedReader bf = null; // shows warning that assigned but never used
String line;
System.out.println("Please enter the file name");
try {
bf = new BufferedReader(new FileReader("C:\\Users\\MohammedArfa\\Desktop\\New folder\\" + scanner.next()));
} catch(FileNotFoundException fnfex) {
//shows warning that the buffer assignment is declared but never used
System.out.println(fnfex.getMessage()+"The file was not found");
}
System.exit(0);
try {
while((line=bf.readLine()) != null) {
System.out.println(line);
}
} catch(IOException ex) {
System.out.println(ex.getMessage()+"Error reading file");
} finally {
System.out.println(0);
}
}
}
将system.exit(0)移动到上面的catch语句中
try {
bf = new BufferedReader(new FileReader("C:\\Users\\MohammedArfa\\Desktop\\New folder\\" + scanner.next()));
} catch(FileNotFoundException fnfex) {
//shows warning that the buffer assignment is declared but never used
System.out.println(fnfex.getMessage()+"The file was not found");
System.exit(0);
}
如果system.exit(0)不在catch内,那么它总是被执行,从而在到达打印输出循环之前终止程序 你有什么错误吗?你真的应该在你的代码格式上下功夫。然后您会看到这是非常错误的
System.exit(0)代码>在您的代码中。下次要多加小心。投票关闭,因为看起来像是一个“大”打字错误(因为这System.exit(0)
看起来不需要)。没有错误,但不显示文件内容