Nested if in java syntax

Содержание

Nested If Statements in Java
2. Conditional Statements
2.1 Syntax
3. Nested If Statements – Code
4. Summary
5. Download The Source Code
12.3. Java – Вложенный оператор if
Синтаксис
Пример
Оглавление
Nested if Statements in Java
Syntax of Nested if Statement
Flowchart
Working of Nested if Statements in Java
Examples of Nested if Statements
Example #1
Example #2
Example #3
Conclusion
Recommended Articles

Nested If Statements in Java

Java is a popular programming language, created in 1995. It is owned by Oracle, and more than 3 billion devices run Java. It is used for mobile applications (especially Android apps), desktop applications, web servers, and application servers, games, and much more.

Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.) It is one of the most popular programming language in the world. It is easy to learn and simple to use and is open-source and free. It is secure, fast and powerful and has a huge community support (tens of millions of developers). Java is an object-oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs.

2. Conditional Statements

the if-else statement , to choose between two alternatives;
the switch statement , to choose between multiple alternatives.

In this article we will learn how to use if-else conditional statement in java

2.1 Syntax

if (condition) then-statement else else-statement

condition is an expression of type boolean, i.e., a conditional expression that is evaluated to true or false
then-statement is a single statement (also called the then-branch of the if-else statement )
else-statement is a single statement (also called the else-branch of the if-else statement )

First, the condition is evaluated. If the result of the evaluation is the value true, the then-statement is executed, otherwise, the else-statement is executed. In both cases, the execution continues with the statement immediately following the if-else statement.

3. Nested If Statements – Code

In this section we will see examples of nested if statements .

private static void printRange(int value) < if (value < 10) < System.out.println("Value should be greater that 9"); >if (value > 30) < System.out.println("Value should be less than 30"); >if (value >= 15) < if (value > >

4. Summary

In this article we saw how to write a nested if statement in Java. We can write nested else-if statements as well but this article does not cover that.

5. Download The Source Code

This was an example of nested if statements in Java.

Источник

12.3. Java – Вложенный оператор if

В Java всегда допустимы вложенные операторы if-else, которые означают, что Вы можете использовать один оператор if или else внутри другого оператора if или else.

Синтаксис

Синтаксис вложенного оператора if..else в Java следующий:

Вы можете делать вложенным else if. else аналогично тому, как мы делали вложенным оператор if в Java.

Пример

Будет получен следующий результат:

1. Java – Самоучитель для начинающих
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3. Java – Установка и настройка
4. Java – Синтаксис
5. Java – Классы и объекты
6. Java – Конструкторы
7. Java – Типы данных и литералы
8. Java – Типы переменных
9. Java – Модификаторы
10. Java – Операторы
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11.1. Java – Цикл while
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11.5. Java – Оператор break
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12. Java – Операторы принятия решений
12.1. Java – Оператор if
12.2. Java – Оператор if..else
12.3. Java – Вложенный оператор if
12.4. Java – Оператор switch..case
12.5. Java – Условный оператор (? 🙂
13. Java – Числа
13.1. Java – Методы byteValue(), shortValue(), intValue(), longValue(), floatValue(), doubleValue()
13.2. Java – Метод compareTo()
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13.4. Java – Метод valueOf()
13.5. Java – Метод toString()
13.6. Java – Метод parseInt()
13.7. Java – Метод Math.abs()
13.8. Java – Метод Math.ceil()
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13.23. Java – Метод Math.atan()
13.24. Java – Метод Math.atan2()
13.25. Java – Метод Math.toDegrees()
13.26. Java – Метод Math.toRadians()
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14. Java – Символы
14.1. Java – Метод Character.isLetter()
14.2. Java – Метод Character.isDigit()
14.3. Java – Метод Character.isWhitespace()
14.4. Java – Метод Character.isUpperCase()
14.5. Java – Метод Character.isLowerCase()
14.6. Java – Метод Character.toUpperCase()
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14.8. Java – Метод Character.toString()
15. Java – Строки
15.1. Java – Метод charAt()
15.2. Java – Метод compareTo()
15.3. Java – Метод compareToIgnoreCase()
15.4. Java – Метод concat()
15.5. Java – Метод contentEquals()
15.6. Java – Метод copyValueOf()
15.7. Java – Метод endsWith()
15.8. Java – Метод equals()
15.9. Java – Метод equalsIgnoreCase()
15.10. Java – Метод getBytes()
15.11. Java – Метод getChars()
15.12. Java – Метод hashCode()
15.13. Java – Метод indexOf()
15.14. Java – Метод intern()
15.15. Java – Метод lastIndexOf()
15.16. Java – Метод length()
15.17. Java – Метод matches()
15.18. Java – Метод regionMatches()
15.19. Java – Метод replace()
15.20. Java – Метод replaceAll()
15.21. Java – Метод replaceFirst()
15.22. Java – Метод split()
15.23. Java – Метод startsWith()
15.24. Java – Метод subSequence()
15.25. Java – Метод substring()
15.26. Java – Метод toCharArray()
15.27. Java – Метод toLowerCase()
15.28. Java – Метод toString()
15.29. Java – Метод toUpperCase()
15.30. Java – Метод trim()
15.31. Java – Метод valueOf()
15.32. Java – Классы StringBuilder и StringBuffer
15.32.1. Java – Метод append()
15.32.2. Java – Метод reverse()
15.32.3. Java – Метод delete()
15.32.4. Java – Метод insert()
15.32.5. Java – Метод replace()
16. Java – Массивы
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20.4. Java – Класс DataOutputStream
20.5. Java – Класс File
20.6. Java – Класс FileReader
20.7. Java – Класс FileWriter
21. Java – Исключения
21.1. Java – Встроенные исключения
22. Java – Вложенные и внутренние классы
23. Java – Наследование
24. Java – Переопределение
25. Java – Полиморфизм
26. Java – Абстракция
27. Java – Инкапсуляция
28. Java – Интерфейсы
29. Java – Пакеты
30. Java – Структуры данных
30.1. Java – Интерфейс Enumeration
30.2. Java – Класс BitSet
30.3. Java – Класс Vector
30.4. Java – Класс Stack
30.5. Java – Класс Dictionary
30.6. Java – Класс Hashtable
30.7. Java – Класс Properties
31. Java – Коллекции
31.1. Java – Интерфейс Collection
31.2. Java – Интерфейс List
31.3. Java – Интерфейс Set
31.4. Java – Интерфейс SortedSet
31.5. Java – Интерфейс Map
31.6. Java – Интерфейс Map.Entry
31.7. Java – Интерфейс SortedMap
31.8. Java – Класс LinkedList
31.9. Java – Класс ArrayList
31.10. Java – Класс HashSet
31.11. Java – Класс LinkedHashSet
31.12. Java – Класс TreeSet
31.13. Java – Класс HashMap
31.14. Java – Класс TreeMap
31.15. Java – Класс WeakHashMap
31.16. Java – Класс LinkedHashMap
31.17. Java – Класс IdentityHashMap
31.18. Java – Алгоритмы Collection
31.19. Java – Iterator и ListIterator
31.20. Java – Comparator
32. Java – Дженерики
33. Java – Сериализация
34. Java – Сеть
34.1. Java – Обработка URL
35. Java – Отправка Email
36. Java – Многопоточность
36.1. Java – Синхронизация потоков
36.2. Java – Межпоточная связь
36.3. Java – Взаимная блокировка потоков
36.4. Java – Управление потоками
37. Java – Основы работы с апплетами
38. Java – Javadoc

Источник

Nested if Statements in Java

Nested if Statement is one of the decisions making statements in Java that flows according to certain conditions. The branching of these conditions is a result of the program’s state change. That is, there will be an if-else condition inside another if-else. If, if-else, if-else-if, jump, switch-case, etc., are some of the other decision making statements in Java. Now, let us see the Nested-if Statement in detail.

Syntax of Nested if Statement

Following is the syntax of Nested if Statement in Java.

Here, Cond1 is Condition 1, and Cond2 is Condition 2.

Flowchart

The following figure depicts the flow chart of the Nested-if condition.

Working of Nested if Statements in Java

Nested-If works similar to the normal If-else condition. The only difference is that there will be an if condition inside another if condition. The working will be as follows.

If Condition 1 is True, then go to if condition 2. If condition 2 is satisfied, its body will execute; otherwise, else part will execute.
If Condition 1 is False, then the body of the else part will be executed.
Once the condition check is finished, exit the loop.
Continue the execution of statements after the loop

The count of the if-else condition varies depending on the user’s requirement.

Examples of Nested if Statements

In order to understand Nested-if in detail, let us see the examples using Java.

Example #1

A simple java program to implement Nested-if condition with only if conditions.

//Nested-if Java program with if conditions only public class NestedIfExample < public static void main(String args[]) < //declare 2 variables and store some values in it int num1 = 23; int num2 = 45; //if the number 1 is 23 if( num1 == 23 ) < //if number is 45 if( num2 == 45 ) < System.out.print("Number 1 is :"+ num1 +" and Number 2 is :"+ num2); >// end of if condition 2 > //end of if condition 1 > //end of main method > //end of class

In this program, two variables- num1 and num2 are declared that stores two numbers, 23 and 45, respectively. In the if condition, num1 is checked whether it is 23. As it is true, then nested if gets executed. That is, another if condition, whether number 2 is 45, is also checked. As it is also true, a line is printed, displaying “Number 1 is 23, and Number 2 is 45”.

Example #2

A simple java program to implement Nested-if condition with both if and else conditions.

//Nested-if Java program with both if and else conditions public class NestedIfExample < public static void main(String args[]) < //declare 2 variables and store some values in it int num1 = 23; int num2 = 48; //if the number 1 is 23 if( num1 == 23 ) < //if number is 45 if( num2 == 45 ) < System.out.print("Number 1 is :"+ num1 +" and Number 2 is :"+ num2); >// end of if condition 2 else < System.out.print("Number 2 is not 45"); >//end of else condition 2 > //end of if condition 1 > //end of main method > //end of class

In this program, two variables- num1 and num2 are declared that stores two numbers, 23 and 48, respectively. In the if condition, num1 is checked whether it is 23. As it is true, then nested if gets executed. That is, another if condition, whether number 2 is 45, is also checked. As it is not true, a line gets printed displaying “Number 2 is not 45”.

Example #3

A simple java program to implement a Nested-if condition that takes input from the user.

//Nested-if Java program that takes input from user and checks the condition import java.util.Scanner; public class NestedIfExample < public static void main(String args[]) < //create object of scanner Scanner sc= new Scanner(System.in); System.out.print("Enter the number to be checked: "); int num1 = sc.nextInt(); //if the number 1 is greater than or equal to 23 if( num1 >= 23 ) < System.out.print("Number 1 is :"+ num1 +" and it is greater than 23."); //if number is 45 if( num1 >= 45 ) < System.out.print("Oh!! it is greater than 45 also"); >// end of if condition 2 else < System.out.print(" But, the number "+num1+" is less than 45"); >//end of else condition 2 > //end of if condition 1 else < System.out.print("The number "+num1+" is less than 23"); >//end of else condition 2 > //end of main method > //end of class

output

In this program, the num1 variable is declared. Then, the user is asked to input num1. Here, 33 is given as input, and In the if condition, num1 is checked whether it is greater than or equal to 23. As it is true, then nested if it gets executed. That is, another if condition, whether number 2 is greater than or equal to 45, is also checked. As it is not true, a line is printed, displaying, “Number 1 is 33, and it is greater than 23. But the number 33 is less than 45”.

Suppose we have given input as 20. What will be the output?? Let us check how the flow will be in that case.