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Fixed old blog posts

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Brandon Rozek 2021-10-10 23:50:45 -04:00
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content/blog/2017-08-28-obtaining-command-line-input-java.md
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@ -21,110 +21,40 @@ mf2_mp-syndicate-to:
kind:
- note
---
To obtain console input for your program you can use the <code class="language-java">Scanner</code> class
To obtain console input for your program you can use the `Scanner` class
First import the relevant library
<pre class="language-java"><code class="language-java">
```java
import java.util.Scanner;
</code></pre>
```
Then create a variable to hold the <code class="language-java">Scanner</code> object
Then create a variable to hold the `Scanner` object
<pre class="language-java"><code class="language-java">
```java
Scanner input;
input = new Scanner(System.in);
</code></pre>
```
Inside the parenthesis, the <code class="language-java">Scanner</code> binds to the System input which is by default the console
Inside the parenthesis, the `Scanner` binds to the System input which is by default the console
The new varible <code class="language-java">input</code> now has the ability to obtain input from the console. To do so, use any of the following methods
The new varible `input` now has the ability to obtain input from the console. To do so, use any of the following methods:
<table class="tg">
<tr>
<th class="tg-yw4l">
Method
</th>
| Method | What it Returns |
| -------------- | ---------------------------------------------------------- |
| `next()` | The next space separated string from the console |
| `nextInt()` | An integer if it exists from the console |
| `nextDouble()` | A double if it exists from the console |
| `nextFloat()` | A float if it exists from the console |
| `nextLine()` | A string up to the next newline character from the console |
| `hasNext()` | Returns true if there is another token |
| `close()` | Unbinds the Scanner from the console |
<th class="tg-yw4l">
What it Returns
</th>
</tr>
<tr>
<td class="tg-yw4l">
next()
</td>
<td class="tg-yw4l">
The next space seperated string from the console
</td>
</tr>
<tr>
<td class="tg-yw4l">
nextInt()
</td>
<td class="tg-yw4l">
An integer if it exists from the console
</td>
</tr>
<tr>
<td class="tg-yw4l">
nextDouble()             
</td>
<td class="tg-yw4l">
A double if it exists from the console
</td>
</tr>
<tr>
<td class="tg-yw4l">
nextFloat()
</td>
<td class="tg-yw4l">
A float if it exists from the console
</td>
</tr>
<tr>
<td class="tg-yw4l">
nextLine()
</td>
<td class="tg-yw4l">
A string up to the next newline character from the console
</td>
</tr>
<tr>
<td class="tg-yw4l">
hasNext()
</td>
<td class="tg-yw4l">
Returns true if there is another token
</td>
</tr>
<tr>
<td class="tg-yw4l">
close()
</td>
<td class="tg-yw4l">
Unbinds the Scanner from the console
</td>
</tr>
</table>
Here is an example program where we get the user&#8217;s first name
<pre class="language-java"><code class="language-java">
```java
import java.util.Scanner;
public class GetName {
@ -135,4 +65,4 @@ public class GetName {
System.out.println("Your first name is " + firstName);
}
}
</code></pre>
```