> For the complete documentation index, see [llms.txt](https://hanfak.gitbook.io/workspace/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hanfak.gitbook.io/workspace/languages/java/beginner/decision-making.md).

# Conditonal/Flow control

* [Conditonal/Flow control](/workspace/languages/java/beginner/decision-making.md#conditonalflow-control)
  * [Links](/workspace/languages/java/beginner/decision-making.md#links)
  * [if](/workspace/languages/java/beginner/decision-making.md#if)
  * [Nested if](/workspace/languages/java/beginner/decision-making.md#nested-if)
  * [Ternary](/workspace/languages/java/beginner/decision-making.md#ternary)
  * [Case/Switch](/workspace/languages/java/beginner/decision-making.md#caseswitch)
* Changing the flow of instructions
* ````
  - follow through if no `break` at the end of the block
  - `default`
    - when all cases have not been matched, it run block in this section
  - In case statement, they can only be compile time constants of same data type of switch value ie
    - literals
    - enum constants
    - final constant variables which has been initialized
  - Multiple cases
    ```java
    case 'A':
    case 'B':
    case 'C':
        doSomething();
        break;

    case 'D':
    case 'E':
        doSomethingElse();
        break;
    default:
      doDefaultStuff();
      break;
  ````
  * Cases, A,B,C will all doSomething() then escape (break out of switch statement)
  * Cases D,E will all doSomethingElse() then break out.
* `Break`
  * will exit out of the loop/case when hit
* `if/else`
* `else if`
* `return`
* Use of block `{}`
  * Dont need them if only one line statement
  * good to have
* Nested if statements
  * Avoid hard to read
  * if needing to write a flow chart, needs to be refactored
* ternary operator
  * Only for simple cases, can be hard to read

## Links

## if

* <https://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html>
* <https://www.tutorialspoint.com/java/if_else_statement_in_java.htm>

## Nested if

* <https://www.tutorialspoint.com/java/nested_if_statements_in_java.htm>
* <https://howtoprogramwithjava.com/nested-if-statements/>

## Ternary

* <http://www.cafeaulait.org/course/week2/43.html>
* <https://alvinalexander.com/java/edu/pj/pj010018>

## Case/Switch

* <https://docs.oracle.com/javase/tutorial/java/nutsandbolts/switch.html>
* <https://www.tutorialspoint.com/java/switch_statement_in_java.htm>
* <https://blog.codefx.org/java/switch-expressions/>