W3schools java loops list

W3schools java loops list

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Java Loops: A Comprehensive Guide

In Java, loops are used to execute a block of code repeatedly for a specified number of iterations. There are three primary types of loops in Java:

Example:

int[] scores = {90, 80, 70, 60};
for (int score : scores) {
System.out.println(score);
}

This code will print each score in the scores array on a new line.

Example:

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

This code will print the numbers 0, 1, 2, 3, and 4 on separate lines.

Example:

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

This code will also print the numbers 0, 1, 2, 3, and 4 on separate lines.

In addition to these primary types of loops, Java also provides:

List colors = Arrays.asList("red", "green", "blue");
for (String color : colors) {
System.out.println(color);
}

Example:

outer: for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
System.out.println(i + " " + j);
if (i == 1) break outer;
}
}

This code will print the numbers 0 0, 0 1, and then exit the loop.

Common Loop Control Statements

Java provides several loop control statements to manage the execution of loops:

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

This code will print the numbers 0, 1, and 2, then exit the loop.

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

This code will print the numbers 0, 1, and 2, then skip to the next iteration.

public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
if (i == 3) return;
System.out.println(i);
}
}

This code will print the numbers 0, 1, and 2, then exit the main method.

In conclusion, Java loops are an essential part of programming in Java. Understanding the different types of loops, as well as the loop control statements, is crucial for writing efficient and effective code.

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.