cleanup.out

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1: //: c10:Cleanup.java
2: // Paying attention to exceptions in constructors.
3: // {CustomTesting}
4: import com.bruceeckel.simpletest.*;
5: import java.io.*;
6: 
7: class InputFile {
8:   private BufferedReader in;
9:   InputFile(String fname) throws Exception {
10:     try {
11:       in =
12:         new BufferedReader(
13:           new FileReader(fname));
14:       // Other code that might throw exceptions
15:     } catch(FileNotFoundException e) {
16:       System.err.println(
17:         "Could not open " + fname);
18:       // Wasn't open, so don't close it
19:       throw e;
20:     } catch(Exception e) {
21:       // All other exceptions must close it
22:       try {
23:         in.close();
24:       } catch(IOException e2) {
25:         System.err.println(
26:           "in.close() unsuccessful");
27:       }
28:       throw e; // Rethrow
29:     } finally {
30:       // Don't close it here!!!
31:     }
32:   }
33:   String getLine() {
34:     String s;
35:     try {
36:       s = in.readLine();
37:     } catch(IOException e) {
38:       System.err.println(
39:         "readLine() unsuccessful");
40:       s = "failed";
41:     }
42:     return s;
43:   }
44:   void cleanup() {
45:     try {
46:       in.close();
47:     } catch(IOException e2) {
48:       System.err.println(
49:         "in.close() unsuccessful");
50:     }
51:   }
52: }
53: 
54: public class Cleanup {
55:   public static void main(String[] args) {
56:     Test monitor = new Test("Cleanup");
57:     try {
58:       InputFile in =
59:         new InputFile("Cleanup.java");
60:       String s;
61:       int i = 1;
62:       while((s = in.getLine()) != null)
63:         System.out.println(""+ i++ + ": " + s);
64:       in.cleanup();
65:     } catch(Exception e) {
66:       System.err.println(
67:         "Caught in main, e.printStackTrace()");
68:       e.printStackTrace(System.err);
69:     }
70:     monitor.expect("Cleanup.out");
71:   }
72: } ///:~