For Loop

In Java, a for loop is a control flow statement that allows a program to execute a block of code repeatedly based on a specified condition. The for loop is particularly useful for iterating over arrays, lists, and other collections.

The basic syntax of a for loop in Java is as follows:

                
    for (initialization; condition; update) {
      // code to execute repeatedly
    }
                
            

In this example, the initialization statement is executed once before the loop begins, and typically initializes a counter variable. The condition is a boolean expression that is evaluated at the beginning of each loop iteration, and if it is true, the code inside the loop is executed. The update statement is executed at the end of each loop iteration, and typically increments or decrements the counter variable.

Here's an example of how a for loop can be used in Java to iterate over an array:

                
    int[] numbers = {1, 2, 3, 4, 5};

    for (int i = 0; i < numbers.length; i++) {
      System.out.println(numbers[i]);
    }
                
            

In this example, the numbers array contains five integers. The for loop initializes a counter variable i to zero, and then tests whether i is less than the length of the numbers array. If the condition is true, the code inside the loop is executed, which prints the value of the ith element of the numbers array to the console. Finally, the i variable is incremented by one, and the loop repeats until i is no longer less than the length of the numbers array.

For loops in Java can also be used to iterate over other types of collections, such as lists, maps, and sets. In addition, for loops can be nested to perform more complex iterations over multiple collections or data structures.

Overall, for loops provide a powerful and flexible way to iterate over collections and perform repetitive tasks in Java.