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Fix typos and documentation in Part 9-2 #182

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Jul 15, 2020
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Fix typos and documentation in Part 9-2 #182

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33 changes: 4 additions & 29 deletions data/part-9/2-interfaces.md
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Original file line number Diff line number Diff line change
Expand Up @@ -912,36 +912,11 @@ public class Factory {
}
}
}
```


<!-- Tehdasta on mahdollista käyttää tuntematta tarkalleen mitä erityyppisiä Talletettava-rajapinnan luokkia on olemassa. Seuraavassa luokka Pakkaaja, jolta voi pyytää laatikollisen esineitä. Pakkaaja tuntee tehtaan, jota se pyytää luomaan esineet: -->

The Factory can be used without exactly knowing what different kind of Packable classes exist. In the next example there is a class Packer that gives a box of things. A packer defines a factory which is used to create the things:

<!--
// ```java
// public class Pakkaaja {
// private Tehdas tehdas;

// public Pakkaaja() {
// this.tehdas = new Tehdas();
// }

// public Laatikko annaLaatikollinen() {
// Laatikko laatikko = new Laatikko(100);

// int i = 0;
// while (i < 10) {
// Talletettava uusiTavara = tehdas.valmistaUusi();
// laatikko.lisaa(uusiTavara);

// i = i + 1;
// }

// return laatikko;
// }
// }
// ``` -->

```java
public class Packer {
Expand Down Expand Up @@ -1140,7 +1115,7 @@ names.add("First");
names.add("Second");
names.add("Third");

System.out.println(palautaKoko(names));
System.out.println(returnSize(names));
```

<sample-output>
Expand Down Expand Up @@ -1213,7 +1188,7 @@ hai: yes

<!--Metodi `keySet` palauttaa `Set`-rajapinnan toteuttavan joukon alkioita. `Set`-rajapinnan toteuttavan joukon voi käydä läpi `for-each`-lauseella. Hajautustaulusta saa talletetut arvot metodin `values`-avulla. Metodi `values` palauttaa `Collection` rajapinnan toteuttavan joukon alkioita. Tutustutaan vielä pikaisesti Set- ja Collection-rajapintoihin. -->

The `keySet` method returns a set of elements that implement the `Set` interface. You can use a for-each statement to go through a set that implements the `Set` interface. The hash values can be obtained from the hash table using the `values` method. The `values` method returns a set of elements that implement the `Collection` interface. Let's take a quidk look at the `Set` and `Collection` interfaces.
The `keySet` method returns a set of elements that implement the `Set` interface. You can use a for-each statement to go through a set that implements the `Set` interface. The hash values can be obtained from the hash table using the `values` method. The `values` method returns a set of elements that implement the `Collection` interface. Let's take a quick look at the `Set` and `Collection` interfaces.

<programming-exercise name='Map as a method parameter' tmcname='part09-Part09_08.MapAsAMethodParameter'>

Expand Down Expand Up @@ -1510,7 +1485,7 @@ Esimerkki varaston käytöstä: -->
Save the stock balance of products in a variable with the `Map<String, Integer>` type, in the same way the prices were stored. Supplement the warehouse with the following methods:

- `public int stock(String product)` returns the current remaining stock of the product in the warehouse. If the product hasn't been added to the warehouse, the method must return 0.
- `public boolean take(String product)` reduces the stock ramaining for the product it received as a parameter by one, and returns true if there was stock remaining. If the product was not available in the warehouse the method returns false. A products stock can't go below zero.
- `public boolean take(String product)` reduces the stock remaining for the product it received as a parameter by one, and returns true if there was stock remaining. If the product was not available in the warehouse the method returns false. A products stock can't go below zero.

An example of the warehouse in use:
<!-- ```java
Expand Down