What are the three loops in Java?
What are the three loops in Java?
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In Java programming language, there are three main types of loops: For loop, While loop, and Do-While loop. Each type of loop is used to execute a block of code repeatedly for a specified number of times or until a certain condition is met.
For Loop
A For loop is used when you know exactly how many times you want the loop to iterate. The syntax for a For loop is as follows:
for (initialization; condition; increment) {
// loop body
}
The initialization statement sets the initial value of a variable, the condition specifies the condition that needs to be met for the loop to continue iterating, and the increment statement updates the value of the variable each iteration. For example:
for (int i = 0; i < 5; i++) {
System.out.println(i);
}
This will print the numbers from 0 to 4.
While Loop
A While loop is used when you want the loop to continue iterating until a certain condition is met. The syntax for a While loop is as follows:
while (condition) {
// loop body
}
The condition is evaluated each iteration, and if it's true, the code inside the loop will execute. For example:
int i = 0;
while (i < 5) {
System.out.println(i);
i++;
}
This will print the numbers from 0 to 4.
Do-While Loop
A Do-While loop is similar to a While loop, but it executes the code at least once before checking the condition. The syntax for a Do-While loop is as follows:
do {
// loop body
} while (condition);
For example:
int i = 0;
do {
System.out.println(i);
i++;
} while (i < 5);
This will print the numbers from 0 to 4.
In summary, For loops are used when you know exactly how many times you want the loop to iterate, While loops are used when you want the loop to continue iterating until a certain condition is met, and Do-While loops are used when you want the code inside the loop to execute at least once before checking the condition.
I hope this helps!
What are the basic loops in java w3schools
I'll ignore the warning and respond in English.
In Java programming language, a loop is used to execute a block of code repeatedly for a specified number of times or until a specific condition is met. Loops allow you to perform repetitive tasks efficiently. Here are the basic types of loops in Java:
1. For Loop (For-Each Loop)
A for
loop is used when you need to iterate over an array, collection, or range of values. It consists of three parts: initialization, condition, and increment.
for (init; cond; inc) {
// code to be executed
}
Example:
int[] scores = {90, 80, 70, 60};
for (int score : scores) {
System.out.println("Score: " + score);
}
2. While Loop
A while
loop is used when you want to execute a block of code as long as a certain condition is true.
while (cond) {
// code to be executed
}
Example:
int i = 0;
while (i < 5) {
System.out.println("Count: " + i);
i++;
}
3. Do-While Loop
A do-while
loop is similar to a while
loop, but the condition is checked after the code has been executed at least once.
do {
// code to be executed
} while (cond);
Example:
int i = 0;
do {
System.out.println("Count: " + i);
i++;
} while (i < 5);
4. Repeat-Until Loop (Do-While Loop with Initialization)
A repeat-until
loop is used when you want to execute a block of code at least once and then repeat it until a certain condition is met.
int i = 0;
do {
// code to be executed
i++;
} while (i < 5);
Example:
int i = 0;
do {
System.out.println("Count: " + i);
i++;
} while (i <= 4);
Key Takeaways
Use afor
loop when iterating over an array, collection, or range of values. Use a while
loop when you want to execute code as long as a certain condition is true. Use a do-while
loop when you want to execute code at least once and then repeat it until a certain condition is met.
These basic loops are the foundation for more complex looping structures, such as nested loops, and they are essential in Java programming.