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Daniel Bulant 2025-11-27 23:55:35 +01:00
parent 28ec01ea9f
commit 21fe12aa34
3 changed files with 56 additions and 46 deletions
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15
week13/Gearbox.java
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@ -3,15 +3,20 @@ package week13;
public class Gearbox { public class Gearbox {
private int gear = 1; private int gear = 1;
public static class IllegalGearChangeException extends RuntimeException {} public static class IllegalGearChangeException extends RuntimeException {
}
void changeGear(int newGear) { void changeGear(int newGear) {
if(newGear == gear) return; if (newGear == gear)
if(newGear != -1 && (newGear < 1 || newGear > 5)) throw new IllegalArgumentException(); return;
if (newGear != -1 && (newGear < 1 || newGear > 5))
throw new IllegalArgumentException();
// newGear is now either -1 or 1..=5 // newGear is now either -1 or 1..=5
var gearToCheck = newGear; var gearToCheck = newGear;
if(gearToCheck == -1) gearToCheck++; if (gearToCheck == -1)
if(Math.abs(gear - newGear) != 1) throw new IllegalGearChangeException(); gearToCheck++;
if (Math.abs(gear - gearToCheck) != 1)
throw new IllegalGearChangeException();
gear = newGear; gear = newGear;
} }
} }

15
week13/Printer.java
View file

@ -7,19 +7,24 @@ public class Printer {
@Override @Override
public String getMessage() { public String getMessage() {
return "No Paper pack found in printer.\n" + return "No Paper pack found in printer.\n" +
"Check that there's enough paper left for this print job, that the Paper pack is clean and that the paper pack chip is undamaged. "+ "Check that there's enough paper left for this print job, that the Paper pack is clean and that the paper pack chip is undamaged. "
+
"Please note that third-party Paper packs may not be supported. Check that the Paper pack is made for this model."; "Please note that third-party Paper packs may not be supported. Check that the Paper pack is made for this model.";
} }
} }
static class OutOfTonerException extends Exception { static class OutOfTonerException extends Exception {
@Override @Override
public String getMessage() { public String getMessage() {
return "Printing supply pack is empty or was not found.\n" + return "Printing supply pack is empty or was not found.\n" +
"Check that an official Printing supply pack is correctly inserted in the printer, try re-seating if necessary. " + "Check that an official Printing supply pack is correctly inserted in the printer, try re-seating if necessary. "
"Check that Printing supply packs are inserted into the correct color coded slots. Check that your Printing resupply subscription is active. " + +
"Check that Printing supply packs are inserted into the correct color coded slots. Check that your Printing resupply subscription is active. "
+
"Please note that third-party Printing supply packs may not be supported. Check that the Paper pack is made for this model."; "Please note that third-party Printing supply packs may not be supported. Check that the Paper pack is made for this model.";
} }
} }
static class PaperJamException extends Exception { static class PaperJamException extends Exception {
@Override @Override
public String getMessage() { public String getMessage() {
@ -28,7 +33,7 @@ public class Printer {
} }
private static Exception getExceptionFromErrorCode(int errorCode) { private static Exception getExceptionFromErrorCode(int errorCode) {
return switch(errorCode / 10) { return switch (errorCode / 10) {
case 0 -> new OutOfPaperException(); case 0 -> new OutOfPaperException();
case 1 -> new OutOfTonerException(); case 1 -> new OutOfTonerException();
case 2 -> new PaperJamException(); case 2 -> new PaperJamException();
@ -46,7 +51,7 @@ public class Printer {
try { try {
print(); print();
System.out.println("Printed successfully, thanks for your patronage."); System.out.println("Printed successfully, thanks for your patronage.");
} catch(Exception e) { } catch (Exception e) {
System.err.println(e.getMessage()); System.err.println(e.getMessage());
} }
} }

2
week13/doc.typ
View file

@ -9,7 +9,7 @@
Explain - in your own words - what is an exception? Explain - in your own words - what is an exception?
An object containing information about why a semi-hidden branching happened, usually used for error states. An object containing information about why a semi-hidden branching happened, usually used for error states.
Thrown exceptions bubble up, as if a return was used, until there's a registered exception handler for a given code region, usually by try/catch. Thrown exceptions bubble up the call stack, as if a return was used, until there's a registered exception handler for a given code region, usually by try/catch.
== Exercise 13.05 == Exercise 13.05