fork download 
  1. import java.io.Serializable;
  2. import java.io.FileInputStream;
  3. import java.io.FileOutputStream;
  4. import java.io.ObjectInputStream;
  5. import java.io.ObjectOutputStream;
  6.  
  7. /**
  8.  * アプリ設定クラス
  9.  */
  10. class AppOption implements Serializable{
  11.  
  12. 	private static final long serialVersionUID = 5245782620871594321L;
  13.  
  14. 	private String option;
  15.  
  16. 	public String getOption() {
  17. 		return option;
  18. 	}
  19.  
  20. 	public void setOption(String option) {
  21. 		this.option = option;
  22. 	}
  23.  
  24. }
  25.  
  26.  
  27. /**
  28.  * IO処理
  29.  */
  30. public class Main {
  31.  
  32. 	public static void main(String[] args) {
  33. 		fwrite();
  34. 		fread();
  35. 	}
  36.  
  37. 	public static void fwrite() {
  38.  
  39. 		AppOption appOption = new AppOption();
  40.  
  41. 		// フィールドに値を設定
  42. 		appOption.setOption("OptionValue");
  43.  
  44. 		try (FileOutputStream fos = new FileOutputStream("./setting");
  45. 				ObjectOutputStream oos = new ObjectOutputStream(fos)) {
  46.  
  47. 			// フィールドの値ごとファイルに書き込む
  48. 			oos.writeObject(appOption);
  49.  
  50. 		} catch (Exception e) {
  51. 			System.err.println(e);
  52. 		}
  53. 	}
  54.  
  55. 	public static void fread() {
  56. 		try (FileInputStream fis = new FileInputStream("./setting");
  57. 				ObjectInputStream ois = new ObjectInputStream(fis);) {
  58.  
  59. 			// ファイルに書き込まれたインスタンスを読み込む
  60. 			AppOption appOption = (AppOption) ois.readObject();
  61.  
  62. 			// デバッグ用表示 -> OptionValue
  63. 			System.out.println(appOption.getOption());
  64.  
  65. 		} catch (Exception e) {
  66. 			System.err.println(e);
  67. 		}
  68. 	}
  69. }
Success #stdin #stdout #stderr 0.1s 320512KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
stderr 
java.io.FileNotFoundException: ./setting (Permission denied)
java.io.FileNotFoundException: ./setting (No such file or directory)
https://ideone.com/HDScy9
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!