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Simplify concept about if-statements (exercism#2508)
* Deprecate concept exercise `blackjack` * Rename concept to `if-else-statements` * Remove `if` statements from `numbers` concept * Remove introduction.md.tpl from `blackjack` * Add if-else-statements concept to cars-assemble
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‎concepts/conditionals-if/.meta/config.json‎

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‎concepts/conditionals-if/about.md‎

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‎concepts/conditionals-if/introduction.md‎

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‎concepts/conditionals-if/links.json‎

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‎concepts/if-else-statements/.meta/config.json‎

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{
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"blurb": "If-else statements can be used to perform conditional logic.",
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"authors": ["TalesDias", "sanderploegsma"],
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"contributors": []
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}

‎concepts/if-else-statements/about.md‎

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# About
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## The _if-then_ statement
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The most basic control flow statement in Java is the [_if-then_ statement][if-statement].
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This statement is used to only execute a section of code if a particular condition is `true`.
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An _if-then_ statement is defined using the `if` clause:
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```java
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class Car {
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void drive() {
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// the "if" clause: the car needs to have fuel left to drive
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if (fuel > 0) {
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// the "then" clause: the car drives, consuming fuel
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fuel--;
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}
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}
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}
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```
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In the above example, if the car is out of fuel, calling the `Car.drive` method will do nothing.
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## The _if-then-else_ statement
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The _if-then-else_ statement provides an alternative path of execution for when the condition in the `if` clause evaluates to `false`.
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This alternative path of execution follows an `if` clause and is defined using the `else` clause:
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```java
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class Car {
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void drive() {
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if (fuel > 0) {
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fuel--;
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} else {
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stop();
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}
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}
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}
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```
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In the above example, if the car is out of fuel, calling the `Car.drive` method will call another method to stop the car.
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The _if-then-else_ statement also supports multiple conditions by using the `else if` clause:
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```java
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class Car {
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void drive() {
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if (fuel > 5) {
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fuel--;
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} else if (fuel > 0) {
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turnOnFuelLight();
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fuel--;
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} else {
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stop();
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}
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}
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}
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```
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In the above example, driving the car when the fuel is less then or equal to `5` will drive the car, but it will turn on the fuel light.
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When the fuel reaches `0`, the car will stop driving.
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[if-statement]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html

‎concepts/if-else-statements/introduction.md‎

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# Introduction
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## The _if-then_ statement
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The most basic control flow statement in Java is the _if-then_ statement.
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This statement is used to only execute a section of code if a particular condition is `true`.
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An _if-then_ statement is defined using the `if` clause:
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```java
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class Car {
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void drive() {
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// the "if" clause: the car needs to have fuel left to drive
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if (fuel > 0) {
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// the "then" clause: the car drives, consuming fuel
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fuel--;
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}
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}
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}
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```
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In the above example, if the car is out of fuel, calling the `Car.drive` method will do nothing.
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## The _if-then-else_ statement
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The _if-then-else_ statement provides an alternative path of execution for when the condition in the `if` clause evaluates to `false`.
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This alternative path of execution follows an `if` clause and is defined using the `else` clause:
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```java
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class Car {
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void drive() {
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if (fuel > 0) {
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fuel--;
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} else {
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stop();
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}
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}
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}
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```
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In the above example, if the car is out of fuel, calling the `Car.drive` method will call another method to stop the car.
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The _if-then-else_ statement also supports multiple conditions by using the `else if` clause:
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```java
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class Car {
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void drive() {
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if (fuel > 5) {
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fuel--;
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} else if (fuel > 0) {
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turnOnFuelLight();
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fuel--;
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} else {
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stop();
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}
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}
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}
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```
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In the above example, driving the car when the fuel is less then or equal to `5` will drive the car, but it will turn on the fuel light.
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When the fuel reaches `0`, the car will stop driving.

‎concepts/if-else-statements/links.json‎

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[
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{
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"url": "https://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html",
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"description": "Java tutorial on if-then-else statements"
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},
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{
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"url": "https://www.javatpoint.com/java-if-else",
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"description": "Example if-then-else statements with flow charts"
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}
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]

‎concepts/numbers/.meta/config.json‎

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{
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"blurb": "Java includes various numeric types including integer and floating-point numbers.",
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"authors": [
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"TalesDias"
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],
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"contributors": []
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"authors": ["TalesDias"],
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"contributors": ["sanderploegsma"]
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}

‎concepts/numbers/about.md‎

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int fromDouble = (int)d;
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```
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An `if` statement can be used to conditionally execute code. The condition of an `if` statement must be of type `boolean`. Java has no concept of _truthy_ values.
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```java
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int x = 6;
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if (x == 5){
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// Execute logic if x equals 5
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} else if (x > 7){
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// Execute logic if x greater than 7
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} else{
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// Execute logic in all other cases
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}
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```
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[arithmetic-operators]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op1.html
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[comparison-operators]: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/op2.html
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[type-casting]: https://www.programiz.com/java-programming/typecasting

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