Зміст курсу
Java Extended
Java Extended
Ternary Operator
How can we shorten an if-else statement?
The if-statement
may not always look elegant, but Java provides a faster and more convenient way to check conditions. It is called the ternary operator, and it has the following syntax:
It looks unclear. Let me explain what is what.
First, we set a condition, for example, 10 > 5
, and then we put a question mark ?
after it. If the condition evaluates to true
, we go to the true block, for example, System.out.println("That's true");
. If the condition evaluates to false
, we go to the false block, where we might have something like System.out.println("That's not true");
.
Let's analyze a more practical example:
Main
package com.example; public class Main { public static void main(String[] args) { System.out.println(10 > 5 ? "That's true" : "That's false"); System.out.println(5 > 6 ? "That's true" : "That's false"); } }
Note
We can place a
boolean
value within a regularSystem.out.println()
because in this case, thetoString()
method of the Boolean class will be applied to the boolean object. The same situation applies to other data types.
You may have noticed that we used the ternary operator inside the System.out.println();
statement. That's the main purpose of using the ternary operator - you can use it within output statements to significantly reduce the amount of code.
We can also use the ternary operator when initializing or returning values. You'll learn more about returning values in the next section when you will study methods.
Example of using ternary operator when initializing value:
Main
package com.example; public class Main { public static void main(String[] args) { final int a = 10 > 2 ? 5 : 2; final int b = 10 < 2 ? 5 : 2; System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
Below is an example code where the ternary operator is replaced with a regular if-statement to help you better understand how it works:
Main
package com.example; public class Main { public static void main(String[] args) { int a = 0; int b = 0; if (10 > 2) { a = 5; } else { a = 2; } if (10 < 2) { b = 5; } else { b = 2; } System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
The result is the same, but you can see how much space we save by using the ternary operator.
Завдання
You have a String
variable. Write a code that prints true
to the screen if the string contains the letter k
, or false
if the string does not contain this letter. Use the ternary operator to practice with it.
Дякуємо за ваш відгук!
Ternary Operator
How can we shorten an if-else statement?
The if-statement
may not always look elegant, but Java provides a faster and more convenient way to check conditions. It is called the ternary operator, and it has the following syntax:
It looks unclear. Let me explain what is what.
First, we set a condition, for example, 10 > 5
, and then we put a question mark ?
after it. If the condition evaluates to true
, we go to the true block, for example, System.out.println("That's true");
. If the condition evaluates to false
, we go to the false block, where we might have something like System.out.println("That's not true");
.
Let's analyze a more practical example:
Main
package com.example; public class Main { public static void main(String[] args) { System.out.println(10 > 5 ? "That's true" : "That's false"); System.out.println(5 > 6 ? "That's true" : "That's false"); } }
Note
We can place a
boolean
value within a regularSystem.out.println()
because in this case, thetoString()
method of the Boolean class will be applied to the boolean object. The same situation applies to other data types.
You may have noticed that we used the ternary operator inside the System.out.println();
statement. That's the main purpose of using the ternary operator - you can use it within output statements to significantly reduce the amount of code.
We can also use the ternary operator when initializing or returning values. You'll learn more about returning values in the next section when you will study methods.
Example of using ternary operator when initializing value:
Main
package com.example; public class Main { public static void main(String[] args) { final int a = 10 > 2 ? 5 : 2; final int b = 10 < 2 ? 5 : 2; System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
Below is an example code where the ternary operator is replaced with a regular if-statement to help you better understand how it works:
Main
package com.example; public class Main { public static void main(String[] args) { int a = 0; int b = 0; if (10 > 2) { a = 5; } else { a = 2; } if (10 < 2) { b = 5; } else { b = 2; } System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
The result is the same, but you can see how much space we save by using the ternary operator.
Завдання
You have a String
variable. Write a code that prints true
to the screen if the string contains the letter k
, or false
if the string does not contain this letter. Use the ternary operator to practice with it.
Дякуємо за ваш відгук!
Ternary Operator
How can we shorten an if-else statement?
The if-statement
may not always look elegant, but Java provides a faster and more convenient way to check conditions. It is called the ternary operator, and it has the following syntax:
It looks unclear. Let me explain what is what.
First, we set a condition, for example, 10 > 5
, and then we put a question mark ?
after it. If the condition evaluates to true
, we go to the true block, for example, System.out.println("That's true");
. If the condition evaluates to false
, we go to the false block, where we might have something like System.out.println("That's not true");
.
Let's analyze a more practical example:
Main
package com.example; public class Main { public static void main(String[] args) { System.out.println(10 > 5 ? "That's true" : "That's false"); System.out.println(5 > 6 ? "That's true" : "That's false"); } }
Note
We can place a
boolean
value within a regularSystem.out.println()
because in this case, thetoString()
method of the Boolean class will be applied to the boolean object. The same situation applies to other data types.
You may have noticed that we used the ternary operator inside the System.out.println();
statement. That's the main purpose of using the ternary operator - you can use it within output statements to significantly reduce the amount of code.
We can also use the ternary operator when initializing or returning values. You'll learn more about returning values in the next section when you will study methods.
Example of using ternary operator when initializing value:
Main
package com.example; public class Main { public static void main(String[] args) { final int a = 10 > 2 ? 5 : 2; final int b = 10 < 2 ? 5 : 2; System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
Below is an example code where the ternary operator is replaced with a regular if-statement to help you better understand how it works:
Main
package com.example; public class Main { public static void main(String[] args) { int a = 0; int b = 0; if (10 > 2) { a = 5; } else { a = 2; } if (10 < 2) { b = 5; } else { b = 2; } System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
The result is the same, but you can see how much space we save by using the ternary operator.
Завдання
You have a String
variable. Write a code that prints true
to the screen if the string contains the letter k
, or false
if the string does not contain this letter. Use the ternary operator to practice with it.
Дякуємо за ваш відгук!
How can we shorten an if-else statement?
The if-statement
may not always look elegant, but Java provides a faster and more convenient way to check conditions. It is called the ternary operator, and it has the following syntax:
It looks unclear. Let me explain what is what.
First, we set a condition, for example, 10 > 5
, and then we put a question mark ?
after it. If the condition evaluates to true
, we go to the true block, for example, System.out.println("That's true");
. If the condition evaluates to false
, we go to the false block, where we might have something like System.out.println("That's not true");
.
Let's analyze a more practical example:
Main
package com.example; public class Main { public static void main(String[] args) { System.out.println(10 > 5 ? "That's true" : "That's false"); System.out.println(5 > 6 ? "That's true" : "That's false"); } }
Note
We can place a
boolean
value within a regularSystem.out.println()
because in this case, thetoString()
method of the Boolean class will be applied to the boolean object. The same situation applies to other data types.
You may have noticed that we used the ternary operator inside the System.out.println();
statement. That's the main purpose of using the ternary operator - you can use it within output statements to significantly reduce the amount of code.
We can also use the ternary operator when initializing or returning values. You'll learn more about returning values in the next section when you will study methods.
Example of using ternary operator when initializing value:
Main
package com.example; public class Main { public static void main(String[] args) { final int a = 10 > 2 ? 5 : 2; final int b = 10 < 2 ? 5 : 2; System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
Below is an example code where the ternary operator is replaced with a regular if-statement to help you better understand how it works:
Main
package com.example; public class Main { public static void main(String[] args) { int a = 0; int b = 0; if (10 > 2) { a = 5; } else { a = 2; } if (10 < 2) { b = 5; } else { b = 2; } System.out.println("Variable 'a' has value: " + a); System.out.println("Variable 'b' has value: " + b); } }
The result is the same, but you can see how much space we save by using the ternary operator.
Завдання
You have a String
variable. Write a code that prints true
to the screen if the string contains the letter k
, or false
if the string does not contain this letter. Use the ternary operator to practice with it.