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  1. import java.io.BufferedInputStream;
  2. import java.io.BufferedOutputStream;
  3. import java.io.DataInputStream;
  4. import java.io.DataOutputStream;
  5. import java.io.FileInputStream;
  6. import java.io.FileOutputStream;
  7. import java.io.IOException;
  8.  
  9. public class DemoData {
  10.     static String pathName = "F:/ccc";
  11.     public static void ghiFile(Double[] gia, int[] soLuong, String[] mota, String path) {
  12. 		DataOutputStream out = null;
  13. 		try {
  14.               out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(path)));
  15. 			for (int i = 0; i < gia.length; i++) {
  16. 				out.writeDouble(gia[i]);
  17. 				out.writeInt(soLuong[i]);
  18. 				out.writeUTF(mota[i]);
  19. 			}
  20. 			System.out.println("Ghi thành công !");
  21.  
  22. 		} catch (Exception e) {
  23. 			// TODO: handle exception
  24. 			e.printStackTrace();
  25.  
  26. 		} finally {
  27. 			try {
  28. 				out.close();
  29. 			} catch (IOException e) {
  30. 				// TODO Auto-generated catch block
  31. 				e.printStackTrace();
  32. 			}
  33. 		}
  34. 	}
  35.  
  36. 	public static String docFile(String path) {
  37. 		String s = "";
  38. 		DataInputStream input = null;
  39. 		try {
  40. 			input = new DataInputStream(new BufferedInputStream(new FileInputStream(path)));
  41. 			while (true) {
  42. 				// Ghi như thế nào thì phải đọc đúng thứ tự
  43. 				double gia = input.readDouble();
  44. 				int soLuong = input.readInt();
  45. 				String moTa = input.readUTF();
  46. 				s += String.format("Bạn đặt %d %s với giá %.2f \n", soLuong, moTa, gia);
  47. 				}
  48.         } catch (Exception e) {
  49. 			// TODO: handle exception
  50. 			e.printStackTrace();
  51. 		}
  52.       finally {
  53. 			try {
  54. 				input.close();
  55. 			} catch (IOException e) {
  56. 				// TODO Auto-generated catch block
  57. 				e.printStackTrace();
  58. 			}
  59. 		}
  60. 		return s;
  61.  
  62. 	}
  63.  
  64. 	public static void main(String[] args) {
  65. 		Double[] gia = new Double[] { 1.8, 2.9, 3.6, 4.7 };
  66. 		int[] soLuong = new int[] { 9, 8, 7, 6 };
  67. 		String[] mota = new String[] { "quần", "áo", "giá", "dép" };
  68.  
  69. 		ghiFile(gia, soLuong, mota, pathName);
  70. 		System.out.println(docFile(pathName));
  71. 	}
  72.  
  73. }
  74.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:9: error: class DemoData is public, should be declared in a file named DemoData.java
public class DemoData {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/PRmhrq
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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