W3schools java loops examples

W3schools java loops examples

Here are some examples of Java loops from W3Schools:

For Loop

A for loop iterates over a sequence (such as an array or a list) and executes a block of code once for each item in the sequence.

Example:

for (int i = 0; i < 5; i++) {
System.out.println("Hello, world!");
}

Output:

Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!

While Loop

A while loop executes a block of code as long as a specified condition is true.

Example:

int i = 0;
while (i < 5) {
System.out.println("Hello, world!");
i++;
}

Output:

Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!

Do-While Loop

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

Example:

int i = 0;
do {
System.out.println("Hello, world!");
i++;
} while (i < 5);

Output:

Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!

Foreach Loop

A foreach loop iterates over a collection (such as an array or a list) and executes a block of code once for each item in the collection.

Example:

String[] fruits = {"Apple", "Banana", "Cherry"};
for (String fruit : fruits) {
System.out.println(fruit);
}

Output:

Apple
Banana
Cherry

Breaking Out of a Loop

Sometimes, you may want to exit a loop early. In Java, you can use the break statement to do so.

Example:

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

Output:

0
1

Loop Labels

You can use a loop label to identify which loop you are referring to when using the break or continue statements.

Example:

outer: for (int i = 0; i < 5; i++) {
inner: for (int j = 0; j < 5; j++) {
if (i == 2) {
break outer;
}
System.out.println(i + " " + j);
}
}

Output:

0 0
0 1
0 2
1 0
1 1

These are just a few examples of Java loops from W3Schools. I hope this helps! Let me know if you have any questions or need further clarification.

do while loop in java w3schools

I'm happy to help! However, since you mentioned responding in English only and referencing W3Schools for a Java while loop, I'll provide an explanation in English.

A while loop in Java is used to execute a block of code as long as a specified condition remains true. Here's the basic syntax:

while (condition) {
// code to be executed
}

In this example:

Here's an example of a simple while loop:

int i = 0;
while (i < 5) {
System.out.println("Hello, World! " + i);
i++;
}

This program will print:

Hello, World! 0
Hello, World! 1
Hello, World! 2
Hello, World! 3
Hello, World! 4

Now, let's create a more complex example using W3Schools. Suppose we want to find the sum of all numbers from 1 to 10.

int sum = 0;
int i = 1;
while (i <= 10) {
sum += i;
i++;
}
System.out.println("The sum is: " + sum);

This program will calculate the sum of the numbers 1 through 10 and print:

The sum is: 55

Here's another example using W3Schools. Suppose we want to print out the Fibonacci sequence for the first 5 numbers.

int a = 0;
int b = 1;
System.out.print(a + " " + b + " ");
int i = 2;
while (i <= 5) {
int temp = a;
a = b;
b = temp + b;
System.out.print(b + " ");
i++;
}

This program will print:

0 1 1 2 3

These are just simple examples of while loops in Java. The while loop is often used when we want to repeat a certain code block as long as the condition remains true.

Let me know if you have any questions or need further clarification!