48 lines
1.3 KiB
Java
48 lines
1.3 KiB
Java
// exceptions/InputFile.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Paying attention to exceptions in constructors
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import java.io.*;
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public class InputFile {
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private BufferedReader in;
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public InputFile(String fname) throws Exception {
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try {
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in = new BufferedReader(new FileReader(fname));
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// Other code that might throw exceptions
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} catch(FileNotFoundException e) {
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System.out.println("Could not open " + fname);
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// Wasn't open, so don't close it
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throw e;
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} catch(Exception e) {
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// All other exceptions must close it
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try {
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in.close();
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} catch(IOException e2) {
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System.out.println("in.close() unsuccessful");
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}
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throw e; // Rethrow
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} finally {
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// Don't close it here!!!
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}
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}
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public String getLine() {
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String s;
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try {
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s = in.readLine();
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} catch(IOException e) {
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throw new RuntimeException("readLine() failed");
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}
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return s;
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}
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public void dispose() {
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try {
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in.close();
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System.out.println("dispose() successful");
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} catch(IOException e2) {
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throw new RuntimeException("in.close() failed");
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}
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}
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}
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