1．从键盘读入10个整数，然后将它们从小到大排序并写入文件c1.txt，然后再将文件的内容读出来,输出到屏幕上。 2．读取某个路径下的所有文本文件中内容，并将其存储在另一个文本文件中存放。 “D:\\www” File f=new File(“D:\\www”);

1. 实现代码如下：

import java.io.*;
import java.util.*;

public class SortAndWrite {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int[] nums = new int[10];
        System.out.println("请输入10个整数：");
        for (int i = 0; i < 10; i++) {
            nums[i] = scanner.nextInt();
        }
        Arrays.sort(nums);

        try {
            FileWriter fw = new FileWriter("c1.txt");
            for (int i : nums) {
                fw.write(i + " ");
            }
            fw.close();

            FileReader fr = new FileReader("c1.txt");
            BufferedReader br = new BufferedReader(fr);
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
            br.close();
            fr.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2. 实现代码如下：

import java.io.*;
import java.util.*;

public class MergeFiles {
    public static void main(String[] args) {
        String path = "D:\\www";
        String outputPath = "output.txt";

        File dir = new File(path);
        if (!dir.isDirectory()) {
            System.out.println(path + "不是一个目录！");
            return;
        }

        try {
            FileWriter fw = new FileWriter(outputPath);
            BufferedWriter bw = new BufferedWriter(fw);

            File[] files = dir.listFiles();
            for (File file : files) {
                if (file.isFile()) {
                    FileReader fr = new FileReader(file);
                    BufferedReader br = new BufferedReader(fr);
                    String line = null;
                    while ((line = br.readLine()) != null) {
                        bw.write(line);
                        bw.newLine();
                    }
                    br.close();
                    fr.close();
                }
            }
            bw.close();
            fw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}