For loop in array Java

For loop in array Java

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The "for" loop is a fundamental control structure in programming that allows you to execute a block of code repeatedly for each element in an array or collection. In Java, the basic syntax for a "for" loop using an array as the iterating variable is:

int[] myArray = {1, 2, 3, 4, 5};
for (int i : myArray) {
// code to be executed for each element in the array
}

In this example, we declare a variable myArray of type int[] and initialize it with an array containing five integer elements. The "for" loop iterates over each element in the array using the variable i, which takes on the value of each element in turn.

You can also use traditional "for" loops that iterate over an array's indices, like this:

int[] myArray = {1, 2, 3, 4, 5};
for (int i = 0; i < myArray.length; i++) {
// code to be executed for each element in the array
}

In this case, the loop iterates over the indices of the array using a variable i, which ranges from 0 to the length of the array minus one. The expression myArray.length returns the number of elements in the array.

You can also use enhanced for loops that iterate over arrays or collections:

String[] myArray = {"apple", "banana", "cherry"};
for (String fruit : myArray) {
// code to be executed for each element in the array
}

This type of loop is particularly useful when working with complex data structures, such as lists or trees.

Here's an example of a more comprehensive use case:

int[] scores = {90, 80, 70, 95, 85};
int totalScore = 0;
for (int score : scores) {
if (score >= 90) {
totalScore += 10;
} else if (score >= 80) {
totalScore += 8;
} else {
totalScore += score;
}
}
System.out.println("Total score: " + totalScore);

In this example, we use a "for" loop to iterate over an array of scores. We calculate the total score by adding up the individual scores and applying specific rules for scores above or below certain thresholds.

Overall, the "for" loop is an essential tool in any Java programmer's toolkit, allowing you to efficiently manipulate arrays and collections with ease!

Array length in java for loop w3schools

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Array Length in Java: For Loop (W3Schools)

Java arrays are used to store a collection of items, and each item is identified by an index or subscript. To iterate over the elements of an array, we can use a for loop.

Here's a simple example:

int[] myArray = {1, 2, 3, 4, 5};
for (int i = 0; i < myArray.length; i++) {
System.out.println("Index " + i + ": " + myArray[i]);
}

In this code snippet:

Here's the output:

Index 0: 1
Index 1: 2
Index 2: 3
Index 3: 4
Index 4: 5

This is a simple example of how you can use a for loop to iterate over the elements of an array in Java. You can apply this concept to more complex scenarios, such as processing arrays of custom objects or performing calculations based on array values.

Array Length in Java: For Loop (W3Schools)

In addition to using a for loop, we can also find the length of an array using the length property. Here's how:

int[] myArray = {1, 2, 3, 4, 5};
int arrayLength = myArray.length;
System.out.println("The length of the array is: " + arrayLength);

In this code snippet:

This approach can be useful when you need to access the length of an array without having to hardcode a specific number or use a separate counter variable.

In summary, we've learned how to:

These concepts are fundamental to working with arrays in Java and can be applied to various programming scenarios.