What is selection java

How do you use selection in java?

Selection is used in Java through conditional statements, such as if-else and switch-case, to execute different sets of code based on the evaluation of a given boolean expression or value.

And now in more detail

Selection is a key concept in Java programming, allowing developers to execute different sets of code based on the evaluation of a given boolean expression or value. This is achieved through conditional statements, such as if-else and switch-case.

According to Oracle’s Java documentation, “The if-then statement is the most basic of all the control flow statements. It tells your program to execute a certain section of code only if a particular test evaluates to true.” This allows for powerful decision-making in a program, as code can be written to respond to a wide range of input and scenarios.

The switch-case statement is another type of selection in Java, allowing a program to execute different blocks of code based on the value of a given variable. The Java documentation provides an example, stating, “The switch statement allows for any number of possible execution paths.”

Interestingly, Java also offers selection through the use of the ternary operator. This allows for a condensed form of if-else statements, as a single line of code can be used to choose between two values based on a boolean expression.

In the words of programming pioneer Alan Kay, “Simple things should be simple, complex things should be possible.” Selection in Java embodies this idea, allowing for efficient and effective decision-making in even the most complicated programs.

To further illustrate the concept of selection in Java, here is a simple example of an if-else statement:

This code assigns the value 5 to the variable x, and then uses an if-else statement to determine whether x is less than 10 or not. If it is, the program prints the message “x is less than 10”. If not, the program prints “x is greater than or equal to 10”. This demonstrates the basic functionality of selection in Java.

In summary, selection is an essential aspect of programming in Java, allowing for powerful decision-making in response to different variables and scenarios. Through conditional statements like if-else and switch-case, developers can create responsive and effective programs that can handle a wide range of inputs and outputs.

Some more answers to your question

• 1. The if Statement This is a single selection statement. It is named so because it only selects or ignores a single action (or group of actions).
• 2. The if..else Statement This is a double selection statement. It is named so because it chooses between two different actions (or a group of actions).
• 3. Switch

This video has the solution to your question

The “Learn Selection Sort in 8 minutes” video introduces the selection sort algorithm using closed boxes containing numbers to be sorted. The algorithm keeps track of the minimum value during each iteration, swapping variables to place the minimum value in the correct position. The tutorial shows how to implement selection sort using nested loops to iterate over an array of integers. The algorithm has O(n²) runtime complexity and is useful for small data sets but progressively inefficient with large data sets.

I am sure you will be interested in these topics as well

Response: Selection sort in java is an in-place comparison-based sorting algorithm that is known for its simplicity over other sorting algorithms. The selection sort technique involves choosing the array’s smallest element and swapping it with the array’s first element (if sorting in ascending order).

Response: Selection Sort in Java (Another way)
Put the first element in the temp and the second element in the first, and then temp in the second number and continue for the next match to sort the whole array in ascending order.

The reply will be: – Selection statements: if and switch – Iteration statements: while, do, and for – Jump statements: break, continue, and goto. (return also belongs in this category.) Several of C’s statements must test the value of an expression to see if it is “true” or “false ” expression to see if it is true or false.

Answer: Selection statements are a program control structure in Java. As the name suggests, they are used to select an execution path if a certain condition is met. There are three selection statements in Java: if, if..else, and switch. Let’s take a closer look at them. 1. The if Statement This is a single selection statement.

In reply to that: This is a single selection statement. It is named so because it only selects or ignores a single action (or group of actions). When you want a certain statement to execute if a given condition is true, then use the if statement. A condition is any expression that gives a boolean result, i.e true or false (1 or 0).

We can create a java program to sort array elements using selection sort. In selection sort algorithm, we search for the lowest element and arrange it to the proper location. We swap the current element with the next lowest number. How does selection sort work? The selection sort algorithm works in a very simple way.

The selection sort algorithm works in a very simple way. It maintains two subarray for the given array. The subarray is already sorted. And the second subarray is unsorted. With every iteration of selection sort, an element is picked from the unsorted subarray and moved to the sorted subarray.

Answer will be: Selection statements are a program control structure in Java. As the name suggests, they are used to select an execution path if a certain condition is met. There are three selection statements in Java: if, if..else, and switch. Let’s take a closer look at them. 1. The if Statement This is a single selection statement.

In reply to that: In this tutorial, we’ll learn Selection Sort, see its implementation in Java, and analyze its performance. 2. Algorithm Overview Selection Sort begins with the element in the 1st position of an unsorted array and scans through subsequent elements to find the smallest element.

This is a single selection statement. It is named so because it only selects or ignores a single action (or group of actions). When you want a certain statement to execute if a given condition is true, then use the if statement. A condition is any expression that gives a boolean result, i.e true or false (1 or 0).

Response will be: This is a double selection statement. It is named so because it chooses between two different actions (or a group of actions). The if..else statement executes a certain action in the if block when a condition is true. Otherwise, it executes an action in the else block when the condition evaluates to a false result.

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Java Selection Statements

In java, the selection statements are also known as decision making statements or branching statements or conditional control statements. The selection statements are used to select a part of the program to be executed based on a condition. Java provides the following selection statements.

• if statement
• if-else statement
• nested if statement
• if-else if statement
• switch statement

if statement in java

In java, we use the if statement to test a condition and decide the execution of a block of statements based on that condition result. The if statement checks, the given condition then decides the execution of a block of statements. If the condition is True, then the block of statements is executed and if it is False, then the block of statements is ignored. The syntax and execution flow of if the statement is as follows.

Let’s look at the following example java code.

import java.util.Scanner; public class IfStatementTest < public static void main(String[] args) < Scanner read = new Scanner(System.in); System.out.print("Enter any number: "); int num = read.nextInt(); if((num % 5) == 0) < System.out.println("We are inside the if-block!"); System.out.println("Given number is divisible by 5!!"); >System.out.println("We are outside the if-block. "); > > 

When we run this code, it produce the following output.

In the above execution, the number 12 is not divisible by 5. So, the condition becomes False and the condition is evaluated to False. Then the if statement ignores the execution of its block of statements.

When we enter a number which is divisible by 5, then it produces the output as follows.

if-else statement in java

In java, we use the if-else statement to test a condition and pick the execution of a block of statements out of two blocks based on that condition result. The if-else statement checks the given condition then decides which block of statements to be executed based on the condition result. If the condition is True, then the true block of statements is executed and if it is False, then the false block of statements is executed. The syntax and execution flow of if-else statement is as follows.

Let’s look at the following example java code.

import java.util.Scanner; public class IfElseStatementTest < public static void main(String[] args) < Scanner read = new Scanner(System.in); System.out.print("Enter any number: "); int num = read.nextInt(); if((num % 2) == 0) < System.out.println("We are inside the true-block!"); System.out.println("Given number is EVEN number!!"); >else < System.out.println("We are inside the false-block!"); System.out.println("Given number is ODD number!!"); >System.out.println("We are outside the if-block. "); > > 

When we run this code, it produce the following output.

Nested if statement in java

Writing an if statement inside another if-statement is called nested if statement. The general syntax of the nested if-statement is as follows.

Let’s look at the following example java code.

import java.util.Scanner; public class NestedIfStatementTest < public static void main(String[] args) < Scanner read = new Scanner(System.in); System.out.print("Enter any number: "); int num = read.nextInt(); if (num < 100) < System.out.println("\nGiven number is below 100"); if (num % 2 == 0) System.out.println("And it is EVEN"); else System.out.println("And it is ODD"); >else System.out.println("Given number is not below 100"); System.out.println("\nWe are outside the if-block. "); > > 

When we run this code, it produce the following output.

if-else if statement in java

Writing an if-statement inside else of an if statement is called if-else-if statement. The general syntax of the an if-else-if statement is as follows.

if(condition_1) < condition_1 true-block; . >else if(condition_2)

Let’s look at the following example java code.

import java.util.Scanner; public class IfElseIfStatementTest < public static void main(String[] args) < int num1, num2, num3; Scanner read = new Scanner(System.in); System.out.print("Enter any three numbers: "); num1 = read.nextInt(); num2 = read.nextInt(); num3 = read.nextInt(); if( num1>=num2 && num1>=num3) System.out.println("\nThe largest number is " + num1) ; else if (num2>=num1 && num2>=num3) System.out.println("\nThe largest number is " + num2) ; else System.out.println("\nThe largest number is " + num3) ; System.out.println("\nWe are outside the if-block. "); > > 

When we run this code, it produce the following output.

switch statement in java

Using the switch statement, one can select only one option from more number of options very easily. In the switch statement, we provide a value that is to be compared with a value associated with each option. Whenever the given value matches the value associated with an option, the execution starts from that option. In the switch statement, every option is defined as a case.

The switch statement has the following syntax and execution flow diagram.

Let’s look at the following example java code.

import java.util.Scanner; public class SwitchStatementTest < public static void main(String[] args) < Scanner read = new Scanner(System.in); System.out.print("Press any digit: "); int value = read.nextInt(); switch( value ) < case 0: System.out.println("ZERO") ; break ; case 1: System.out.println("ONE") ; break ; case 2: System.out.println("TWO") ; break ; case 3: System.out.println("THREE") ; break ; case 4: System.out.println("FOUR") ; break ; case 5: System.out.println("FIVE") ; break ; case 6: System.out.println("SIX") ; break ; case 7: System.out.println("SEVEN") ; break ; case 8: System.out.println("EIGHT") ; break ; case 9: System.out.println("NINE") ; break ; default: System.out.println("Not a Digit") ; >> > 

When we run this code, it produce the following output.

🔔 In java, the case value of a switch statement can be a String value.

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Selection Statement in Java

In java, selection statements are also known as branching statements or conditional or decision-making statements. It is used to select part of a program to be executed based on condition. In this article, we will be learning about selection statements in java along with its types and uses.

What is a Selection Statement in Java?

These are statements that control programs in java. They are used for selecting a path of execution if a certain condition is met.

The Selection Statements in Java

Following are the types of selection statements in java:

if Statement

Explanation: if the test expression is true then the statement is executed else the statement is not executed.

if-else Statement

General format:

Explanation: if the test expression is true then the statement is executed else statement 2 is executed.

Nested if Statement

General format:

Explanation: In this, writing an if statement inside another if statement is called the next if statement. If the first condition is true, it will check for the second condition after which the inner block will be executed else not.

if- else if- else Statement

General format:

Explanation: if test expression1 is true then statement 1 is executed else if test expression2 is true then statement2 is executed else statement3 will be executed.

Switch Statement

General format:

Explanation: if the value of the expression is matched with value 1, then the corresponding stmt sequence is executed. If not matched with value 1 then try with the next case value and so on. If none of the cases match then default stmt is executed. All cases should be unique. The expression must be of type byte, short, int, or char Each case value should be literal. Default is not compulsory and can be written anywhere.

Conclusion

• Selection statements are also known as branching statements or conditional or decision-making statements. It is used to select part of a program to be executed based on condition.
• The selection statements in Java
  • if statement
  • if-else statement
  • nested if statement
  • if-else if statement
  • switch statement

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