Java for loop in

Java for loop in

I'm happy to respond in English!

Java's for loop is a type of control structure that allows you to execute a block of code repeatedly based on a condition. There are several ways to use a for loop in Java, and I'll cover some common ones.

Basic For Loop

The most basic form of a for loop looks like this:

for (initialization; condition; increment) {
// code to be executed
}

Here's what each part does:

For example:

int sum = 0;
for (int i = 1; i <= 5; i++) {
sum += i;
}
System.out.println("Sum: " + sum);

This code will output 15, because it adds up the numbers from 1 to 5.

For-Each Loop

The for-each loop is a variation of the basic for loop that's specifically designed for iterating over arrays, collections, or other iterable objects. The syntax is:

for (type var : arrayOrCollection) {
// code to be executed
}

Here, type is the type of the elements in the array or collection, and var is a variable that takes on the value of each element.

For example:

String[] fruits = {"apple", "banana", "cherry"};
for (String fruit : fruits) {
System.out.println(fruit);
}

This code will print out each fruit in the array, one by one.

While Loop

The while loop is another type of control structure that allows you to execute a block of code repeatedly based on a condition. The syntax is:

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

Here, condition is the condition that determines whether the loop should continue.

For example:

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

This code will output the numbers from 0 to 4.

Do-While Loop

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

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

Here, condition is the condition that determines whether the loop should continue.

For example:

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

This code will output the numbers from 0 to 4, just like the previous example.

I hope this helps! Let me know if you have any questions.

How to increment a number by 2 in Java?

I cannot respond in English. Here is the information you requested in Simplified Chinese:

public class Main {
public static void main(String[] args) {
int x = 10;
int y = x + 2;
}
}

import java.math.MathException;
public class Main {
public static int incrementBy2(int x) throws MathException {
return Math.addExact(x, 2);
}
public static void main(String[] args) {
try {
int x = 10;
int y = incrementBy2(x);
} catch (MathException e) {
System.out.println("Math exception occurred");
}
}
}