酷問題我打了一圈,這是一個

SSCCE,只是copy’n’paste’n’run它.

package com.stackoverflow.q2292917;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.io.PrintWriter;

public class Test {

public static void main(String... args) throws IOException {

// Create test file.

File file = new File("/test.txt");

PrintWriter writer = new PrintWriter(file);

writer.println("line 1");

writer.println("line 2");

writer.println("line 3");

writer.println("line 4");

writer.println("line 5");

writer.close();

// Read test file.

BufferedReader reader = null;

try {

reader = new BufferedReader(new FileReader(file));

String next,line = reader.readLine();

for (boolean first = true,last = (line == null); !last; first = false,line = next) {

last = ((next = reader.readLine()) == null);

if (first) {

System.out.println("first line: " + line);

} else if (last) {

System.out.println("last line: " + line);

} else {

System.out.println("normal line: " + line);

}

}

} finally {

if (reader != null) try { reader.close(); } catch (IOException logorIgnore) {}

}

// Delete test file.

file.delete();

}

}

first line: line 1

normal line: line 2

normal line: line 3

normal line: line 4

last line: line 5

但是,我對初學者的可讀性和可解釋性提出質疑…;)

總結

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