java速成课件输入输出流1.ppt

* package ch9.eg9_1; import java.io.*; //使用字节流合并文件 import java.io.*; public class merge { public static void main(String[] args) { FileInputStream fin1,fin2; FileOutputStream fout; try { fin1 = new FileInputStream(example\\eg9_1a.txt); fin2 = new FileInputStream(example\\eg9_1b.txt); fout = new FileOutputStream(example\\eg9_1c.txt); int c = fin1.read(); while (c != -1) { fout.write(c); System.out.print((char) c);// 注意要转换类型 c = fin1.read(); } fin1.close(); c = fin2.read(); while (c != -1) { fout.write(c); System.out.print((char) c);// 注意要转换类型 c = fin2.read(); } fin2.close(); fout.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } * * 为磁盘文件建立File类对象； 为该File对象建立FileOutputStream类流对象，建立其与磁盘文件的连接； * import java.io.*; //将特定数据写入文件，并读出来比较最大值。 public class DataToFile { static void Input() { FileOutputStream fout; try { // 将四个同学的信息写入文件 fout = new FileOutputStream(example\\eg9_2.txt); DataOutputStream dout = new DataOutputStream(fout); String[] names = { Tom, Jack, Rose, Susan }; int[] Nos = { 80901, 20012, 30056, 90008 }; double[] scores = { 67.5, 78.0, 88.5, 90.5 }; for (int i = 0; i 4; i++) { dout.writeUTF(names[i]); dout.writeInt(Nos[i]); dout.writeDouble(scores[i]); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } static void FindMax() { try { FileInputStream fin = new FileInputStream(example\\eg9_2.txt); DataInputStream din = new DataInputStream(fin); double score = 0; for (int i = 0; i 4; i++) { din.readUTF(); din.readInt(); double tmp = din.readDouble(); if (tmp score) score = tmp; } System.out.println(成绩最高分： + score); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public stati