Databases
StackOverflow2013
Postsdbo
POLogic of Java Operators && and ||
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POLogic of Java Operators && and ||
    primarykey
    data
    text
    <p>Hello dear Programmers, </p> <p>I have a String <code>String input = "30.09.1993";</code> Then i want to save all numbers in this string in an array(Only numbers!). The "." are at index 2 and 5 so i want to skip these parts of my string in my loop with an if-statement.</p> <p>I fixed my problem and everything works fine but I'm confused with the logic of the <code>&amp;&amp;</code> and <code>||</code> operators. </p> <p>This is my working code:</p> <pre><code>String input = "30.09.1993"; int[] eachNumbers = new int[8]; int x = 0; for(int i = 0; i &lt;= 9; i++){ if(i != 2 &amp;&amp; i != 5){ eachNumbers[x] = Integer.parseInt(input.substring(i, i+1)); x++; } } </code></pre> <p>And this is the code which doesnt work:</p> <pre><code>String input = "30.09.1993"; int[] eachNumbers = new int[8]; int x = 0; for(int i = 0; i &lt;= 9; i++){ if(i != 2 || i != 5){ eachNumbers[x] = Integer.parseInt(input.substring(i, i+1)); x++; } } </code></pre> <p>The only difference between these two code snippets are the operators in the if-clause.</p> <p>I thought that the results for these operators are:</p> <p><strong><code>&amp;&amp;</code> operator:</strong> </p> <pre><code>false + false = false true + false = false false + true = false true + true = true </code></pre> <p><strong><code>||</code> operator:</strong></p> <pre><code>false + false = false true + false = true false + true = true true + true = true </code></pre> <p>So in my opinion the second code snippet should work and the first should throw a <code>NumberFormatException</code>. But thats not the case. </p> <p>I'm sure there are some better solutions for what im doing but my question is only about the logic in my if-statement. Can someone explain me the logic behind this? I'm totally confused and thankful for every helping answer.</p> <p>Greetings Lukas Warsitz</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USLukas Warsitz
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POLogic of Java Operators && and ||
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POLogic of Java Operators && and ||
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POLogic of Java Operators && and ||
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload