【输入输出流】将一个内容均为数字的文件中的内容从大到小排序

import java.io.*;
import java.util.Arrays;
public class Sort {
    public void TestSort() throws IOException {
        BufferedReader br = new BufferedReader(new FileReader("F:\\Java\\IO Study 03\\test.txt"));
        int c = 0;
        String len;
        String[] str = new String[1];
        while ((len = br.readLine()) != null) {
            str[c] = len;
            str = Arrays.copyOf(str, str.length + 1);
            c++;
        }
        if (c != 0) {
            int[] ic = new int[c];
            c--;
            for (int m = 0; m <= c; m++) {
                ic[m] = Integer.parseInt(str[m]);
            }
            for (int i = 1; i < ic.length; i++) {
                int x = ic[i];
                int j = i - 1;
                while (j >= 0 && ic[j] < x) {
                    ic[j + 1] = ic[j];
                    j--;
                }
                ic[j + 1] = x;
            }
            for (int m = 0; m < ic.length; m++) {
                str[m] = String.valueOf(ic[m]);
            }
            br.close();
            BufferedWriter bw = new BufferedWriter(new FileWriter("F:\\Java\\IO Study 03\\test.txt"));
            for (int m = 0; m < ic.length; m++) {
                bw.write(str[m]+"\n");
                bw.flush();
            }
            bw.close();
        }else{
            System.out.println(" ");
            System.exit(-1);
        }
    }
}

运行前文件中的内容运行后文件中的内容