What is the decision making statement in java with example

Tammy 14 Published: 11/27/2024

What is the decision making statement in java with example

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In Java, a decision-making statement is used to control the flow of a program based on certain conditions or decisions. The most common type of decision-making statement in Java is an if-else statement.

The basic syntax of an if-else statement in Java is:

if (condition) {
// code to be executed if condition is true
} else {
// code to be executed if condition is false
}

Let's take a simple example to illustrate how it works. Suppose we want to check whether a person is eligible to vote or not based on their age.

public class VoteEligibility {
public static void main(String[] args) {
int age = 25; // Assuming the person's age is 25
if (age >= 18) { // The minimum voting age in most countries is 18
System.out.println("You are eligible to vote!");
} else {
System.out.println("Sorry, you're not eligible to vote yet.");
}
}
}

In this example:

We first define a variable age and assign it the value 25. Then, we use an if statement to check whether the person is eligible to vote or not. The condition is age >= 18, which checks if the age is greater than or equal to 18. If the condition is true (i.e., the person's age is 18 or more), then the code inside the if block will be executed, printing "You are eligible to vote!" to the console. If the condition is false (i.e., the person's age is less than 18), then the code inside the else block will be executed, printing "Sorry, you're not eligible to vote yet." to the console.

This simple example demonstrates how if-else statements can be used in Java to make decisions based on certain conditions. The if statement checks whether a condition is true or false and executes different blocks of code accordingly.

Other types of decision-making statements in Java include:

Switch-case statement: This is similar to an if-else statement, but it's used when you have multiple cases to check against. Loops (for, while, do-while): These are used to repeat a block of code based on certain conditions or iterations.

In conclusion, decision-making statements in Java allow programmers to control the flow of their programs and make decisions based on specific conditions. They're essential for writing robust, efficient, and scalable code.

What is decision-making and its classification in Java?

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Decision-making, also known as decision support or decision analysis, is the process of making informed choices by evaluating available alternatives based on their expected outcomes. In software development, decision-making typically refers to a set of rules or logic used to make decisions within an application.

In Java, decision-making can be classified into several categories:

Simple Conditional Statements: These are if-else statements that execute different code blocks based on a specific condition. For example:

int x = 5;
if (x > 10) {
System.out.println("x is greater than 10");
} else {
System.out.println("x is less than or equal to 10");
}

Switch Statements: These allow you to execute different code blocks based on a value of an enumeration or string. For example:

String dayOfWeek = "Monday";
switch (dayOfWeek) {
case "Sunday":
System.out.println("Sunday is a day off");
break;
case "Monday":
System.out.println("Monday is the start of the week");
break;
default:
System.out.println("Day not found in the switch statement");
}

Loops with Decision-Making: These involve using loops (e.g., for, while) to iterate through a set of conditions and make decisions accordingly. For example:

for (int i = 0; i < 10; i++) {
if (i % 2 == 0) {
System.out.println("Even number: " + i);
} else {
System.out.println("Odd number: " + i);
}
}

Decision Trees: These involve using a combination of conditions and logical operators to make decisions based on multiple factors. For example:

String customerType = "Regular";
String purchaseAmount = "Above 1000";
if (customerType.equals("VIP") && Double.parseDouble(purchaseAmount) > 5000) {
System.out.println("Eligible for VIP discount");
} else if ((customerType.equals("Regular") || customerType.equals("New")) &&
Double.parseDouble(purchaseAmount) > 1000) {
System.out.println("Eligible for regular discount");
}

Machine Learning and AI-driven Decision-Making: These involve using advanced techniques like neural networks, decision forests, or reinforcement learning to make complex decisions based on large datasets.

In summary, Java provides various constructs and mechanisms for implementing decision-making in applications, ranging from simple conditional statements to more complex structures like loops, switch statements, and decision trees. Additionally, machine learning and AI-driven approaches can be used to develop sophisticated decision-support systems.