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pig-latin: add hints about no starter implementation (#1097)
* Add hints.md and generate new README * Remove extra line from README.md
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Since this exercise has difficulty 5 it doesn't come with any starter implementation. | ||
This is so that you get to practice creating classes and methods which is an important part of programming in Java. | ||
It does mean that when you first try to run the tests, they won't compile. | ||
They will give you an error similar to: | ||
``` | ||
path-to-exercism-dir\exercism\java\name-of-exercise\src\test\java\ExerciseClassNameTest.java:14: error: cannot find symbol | ||
ExerciseClassName exerciseClassName = new ExerciseClassName(); | ||
^ | ||
symbol: class ExerciseClassName | ||
location: class ExerciseClassNameTest | ||
``` | ||
This error occurs because the test refers to a class that hasn't been created yet (`ExerciseClassName`). | ||
To resolve the error you need to add a file matching the class name in the error to the `src/main/java` directory. | ||
For example, for the error above you would add a file called `ExerciseClassName.java`. | ||
|
||
When you try to run the tests again you will get slightly different errors. | ||
You might get an error similar to: | ||
``` | ||
constructor ExerciseClassName in class ExerciseClassName cannot be applied to given types; | ||
ExerciseClassName exerciseClassName = new ExerciseClassName("some argument"); | ||
^ | ||
required: no arguments | ||
found: String | ||
reason: actual and formal argument lists differ in length | ||
``` | ||
This error means that you need to add a [constructor](https://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html) to your new class. | ||
If you don't add a constructor, Java will add a default one for you. | ||
This default constructor takes no arguments. | ||
So if the tests expect your class to have a constructor which takes arguments, then you need to create this constructor yourself. | ||
In the example above you could add: | ||
``` | ||
ExerciseClassName(String input) { | ||
} | ||
``` | ||
That should make the error go away, though you might need to add some more code to your constructor to make the test pass! | ||
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||
You might also get an error similar to: | ||
``` | ||
error: cannot find symbol | ||
assertEquals(expectedOutput, exerciseClassName.someMethod()); | ||
^ | ||
symbol: method someMethod() | ||
location: variable exerciseClassName of type ExerciseClassName | ||
``` | ||
This error means that you need to add a method called `someMethod` to your new class. | ||
In the example above you would add: | ||
``` | ||
String someMethod() { | ||
return ""; | ||
} | ||
``` | ||
Make sure the return type matches what the test is expecting. | ||
You can find out which return type it should have by looking at the type of object it's being compared to in the tests. | ||
Or you could set your method to return some random type (e.g. `void`), and run the tests again. | ||
The new error should tell you which type it's expecting. | ||
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||
After having resolved these errors you should be ready to start making the tests pass! |
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