Lernen For-Each Loop

What is a for-each Loop?

The for-each loop, also referred to as the enhanced for loop, offers a concise and simplified method for iterating over elements of an array or any iterable collection in Java. It removes the necessity for explicit indexing and streamlines the code.

The syntax for this loop is as follows:

Main.java


              123
            
for (ElementType variable : iterable) {
    // Code to be executed for each element
}

Explanation of each element:

ElementType: the data type of elements in the array;
variable: a variable representing each array element in each iteration;
iterable: the array or iterable collection you want to iterate over.

The for-each loop automatically iterates over each element of the array or iterable collection, assigning it to the variable in each iteration until all elements have been processed.

Let's take a look at an example of using a for-each loop:

Main.java


              1234567891011
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3, 4, 5};

        for (int element : array) {
            System.out.println(element);
        }
    }
}

We can also perform operations on each element of an array using a for-each loop. Let's consider an example task:

You need to multiply each element of a double array by 3 and display the result on the screen using a for-each loop.

Main.java


              123456789101112
            
package com.example;

public class Main {
    public static void main(String[] args) {
        double[] array = {1.5, 2.0, 3.4, 4.5, 5.0};

        for (double element : array) {
            element = element * 3;
            System.out.println(element);
        }
    }
}

As you can see, we are multiplying each element by 3 without using indexing, using the statement element = element * 3;.

Aufgabe

Swipe to start coding

Imagine you work in a warehouse, and you're given an array containing the weights of packages.
Your task is to write a program that checks if there are any packages with negative weights.

Use a for-each loop to iterate through all the package weights.
Inside the loop, check if the current weight is negative (< 0).
If a negative weight is found, exit the loop and return false.
If all values are non-negative, return true.

Lösung

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Abschnitt 1. Kapitel 28

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What is a for-each Loop?

The syntax for this loop is as follows:

Main.java


              123
            
for (ElementType variable : iterable) {
    // Code to be executed for each element
}

Explanation of each element:

ElementType: the data type of elements in the array;
variable: a variable representing each array element in each iteration;
iterable: the array or iterable collection you want to iterate over.

The for-each loop automatically iterates over each element of the array or iterable collection, assigning it to the variable in each iteration until all elements have been processed.

Let's take a look at an example of using a for-each loop:

Main.java


              1234567891011
            
package com.example;

public class Main {
    public static void main(String[] args) {
        int[] array = {1, 2, 3, 4, 5};

        for (int element : array) {
            System.out.println(element);
        }
    }
}

We can also perform operations on each element of an array using a for-each loop. Let's consider an example task:

You need to multiply each element of a double array by 3 and display the result on the screen using a for-each loop.

Main.java


              123456789101112
            
package com.example;

public class Main {
    public static void main(String[] args) {
        double[] array = {1.5, 2.0, 3.4, 4.5, 5.0};

        for (double element : array) {
            element = element * 3;
            System.out.println(element);
        }
    }
}

As you can see, we are multiplying each element by 3 without using indexing, using the statement element = element * 3;.

Aufgabe

Swipe to start coding

Imagine you work in a warehouse, and you're given an array containing the weights of packages.
Your task is to write a program that checks if there are any packages with negative weights.

Use a for-each loop to iterate through all the package weights.
Inside the loop, check if the current weight is negative (< 0).
If a negative weight is found, exit the loop and return false.
If all values are non-negative, return true.

Lösung

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War alles klar?

Danke für Ihr Feedback!

Abschnitt 1. Kapitel 28

single