Conditonal/Flow control

• Conditonal/Flow control

  • Links

  • if

  • Nested if

  • Ternary

  • Case/Switch

• 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/