What are control flow statements in Java?

What are control flow statements in Java?

Control Flow Statements!

In Java, control flow statements are used to control the execution of a program's flow by making decisions, looping through blocks of code, or jumping to specific locations. These statements play a crucial role in writing efficient and effective programs.

1. If-Else Statement

The if-else statement is one of the most common control flow statements in Java. It checks a condition and executes a block of code if it's true, and another block of code if it's false. The basic syntax is:

if (condition) {
// execute if condition is true
} else {
// execute if condition is false
}

2. Switch Statement

The switch statement allows you to perform different actions based on the value of an expression. It evaluates the value and executes the corresponding block of code. The syntax is:

switch (expression) {
case value1:
// execute for value1
break;
case value2:
// execute for value2
break;
default:
// execute if none of the above cases match
}

3. For Loop

The for loop is used to iterate through a block of code repeatedly based on a specific condition. It's commonly used when you need to repeat an action over and over until a condition is met. The syntax is:

for (initialization; condition; increment) {
// execute repeatedly
}

4. While Loop

The while loop is similar to the for loop, but it only checks the condition after each iteration. This means you need to ensure that your loop has a finite number of iterations or have a way to exit the loop. The syntax is:

while (condition) {
// execute repeatedly until condition is false
}

5. Do-While Loop

The do-while loop combines the benefits of while loops and for loops. It executes a block of code at least once, and then continues to repeat if the condition is true. The syntax is:

do {
// execute repeatedly
} while (condition);

6. Break Statement

The break statement is used to exit a loop or switch statement prematurely. This can be useful when you need to stop iterating through code under certain conditions.

7. Continue Statement

The continue statement skips the rest of the current iteration and goes back to the beginning, re-evaluating the condition before continuing the loop.

8. Return Statement

The return statement is used in methods to exit and send a value back to the calling method.

In conclusion, control flow statements are essential for writing robust and efficient Java programs. By using these statements effectively, you can make your code more readable, maintainable, and scalable.

So, which control flow statement will you use next?

Control flow statements in java with examples pdf

I'm happy to help you with your request! However, please note that I can only provide the response in Simplified Chinese as per the rules you provided earlier .

Now, let's dive into controlling flow statements in Java!

Control Flow Statements in Java

In programming, control flow statements are used to direct the flow of program execution based on certain conditions or decisions. Java provides several control flow statements that help developers manage the program's logic and decision-making processes. Here are some common control flow statements in Java:

The if-else statement is used to execute a block of code if a specific condition is met, or else execute another block of code.

Example:

int age = 25;
if (age >= 18) {
System.out.println("You are an adult.");
} else {
System.out.println("You are not an adult.");
}

In this example, the program checks if the age variable is greater than or equal to 18. If it is, the program prints "You are an adult." Otherwise, it prints "You are not an adult."

The switch statement is used to execute a specific block of code based on the value of an expression.

Example:

int dayOfWeek = 3;
switch (dayOfWeek) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
default:
System.out.println("Unknown day of the week.");
break;
}

In this example, the program checks the value of dayOfWeek and prints the corresponding day of the week. The break statement is used to exit the switch block when a match is found.

The for loop is used to execute a block of code repeatedly until a specific condition is met.

Example:

for (int i = 0; i < 5; i++) {
System.out.println("Iteration " + i);
}

In this example, the program prints the numbers from 0 to 4 using a for loop. The loop will execute as long as i is less than 5.

The while loop is used to execute a block of code repeatedly until a specific condition is met.

Example:

int i = 0;
while (i < 5) {
System.out.println("Iteration " + i);
i++;
}

In this example, the program prints the numbers from 0 to 4 using a while loop. The loop will execute as long as i is less than 5.

The do-while loop is similar to the while loop, but it executes the block of code at least once before checking the condition.

Example:

int i = 0;
do {
System.out.println("Iteration " + i);
i++;
} while (i < 5);

In this example, the program prints the numbers from 0 to 4 using a do-while loop. The loop will execute at least once before checking the condition.

The break statement is used to exit a loop or a switch block prematurely.

Example:

for (int i = 0; i < 5; i++) {
if (i == 3) {
break;
}
System.out.println("Iteration " + i);
}

In this example, the program prints the numbers from 0 to 2 using a for loop. When i reaches 3, the loop exits.

The continue statement is used to skip the current iteration of a loop and move on to the next iteration.

Example:

for (int i = 0; i < 5; i++) {
if (i == 2) {
continue;
}
System.out.println("Iteration " + i);
}

In this example, the program prints the numbers from 0 to 4 using a for loop. When i reaches 2, the loop skips that iteration and moves on to the next one.

These are some of the most commonly used control flow statements in Java. Understanding how to use them effectively is crucial for writing efficient and logical code.

PDF: You can find many examples and explanations of these control flow statements in various online resources, including PDF tutorials and documentation.

I hope this helps! Let me know if you have any questions or need further clarification .