If statments

If statements are useful for being a sort of block. They check if a value is true and if it is true, then it executes what is inside it's brackets. If statements can be used for movement of a player or enemy. If statements are very helpful in every programming language, since it helps to execute something under a certain condition. Here is an example of an if statement:

Just saying the boolean's name will basically be the same as saying if (enabled == true) {}
if (enabled) {} is a faster way of saying it. It saves space aswell. There are symbols in Java that can help if statements.

&& symbol

The two ampersan symbols mean and. In an if statement both sides have to be true. Examples:
if (x == 5 && y == 0) {trigger = true}
if (x == 0 && y == 5) {trigger = false}

|| symbol

The two || symbols mean or. Or symbols in if statements say if value is 5 or the value is 10 then do stuff. Examples:
if (x == 5 || y == 0) {trigger = true}
if (x == 0 || y == 5) {trigger = false}

> symbol

The > symbol means greater than. Examples:
if (x > 5) {trigger = true}
if (y < 0) {trigger = false}

< symbol

The > symbol means less than. Examples:
if (x < 5) {trigger = false}
if (y > 0) {trigger = true}

>= symbol

The >= symbol means greater than or equal to. Examples:
if (x >= 5) {trigger = true}
if (y <= 0) {trigger = false}

<= symbol

The <= symbol means less than or equal to. Examples:
if (x <= 5) {trigger = false}
if (y <= 0) {trigger = true}

!= symbol

The != symbols means does not equal to. Examples:
if (x != 5) {trigger = false}
if (y != 0) {trigger = true}

Else

Lets say you have an if statement, and you want to say that if this condition is not true then do something else. Thats where else statements come into play. Else statments can be very useful when game designing. Here is an example of an else statement, however the if statement is true so it does not do the else statement:


However here the if statement returns false, therefore if there is an else statement, it will execute whatever is inside the else statement's brackets.

Else if

Else if statements are like else statments. However they have to check wether their condition is true. So that lets say we have an if statement and it checks if a number is equal to 5. However if not, then it checks if it is below or equal to 0. So the else statement only only triggers when the number is below or equal to 0. Here is an example:

As you can see it went into the if statement and did not trigger the else if statement. Now let's try setting the number to -1.

As you can see it triggered the else if statement and we got a different result. This block of code will not trigger if the number is greater than or equal to 1 and less than or equal to 4.

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