Comparison Operators
Things to note:
a. Priority ! > && > ||
b. && Short circuits. If the first condition is not satisfied. The rest of the condition will not be evaluated.
Control Flow — Conditional Statement
things to note:
a. {} can be eliminated if the statement is a one-liner and not a declaration statement.
b. The Tneray Operator to simplify the code:
int income = 120_000;
String className = income > 100_000 ? "First" : "Economy"
c. Switch Statement:
Loop In Java
- For Loop
things to note: Break statement to break out entire loop operation while Continue Statement to break out current iteration and move on to the next element of the iterable.
2. While Loop
//if you have a condition to break the loop in side the statement, use pattern
while(true){
....
if(condition)
break;}
3. do-while loop
4. for-each loop
A common CLI Validation Pattern:
declare a variable
while(true){
get user input
if user input is valid:
do something..
break
output "input have to be valid" }