For Each Loop

In Java, you can use a for-each loop, also known as an enhanced for loop, to iterate over elements of an iterable collection or array without explicitly controlling the iteration variables.

This loop simplifies the process of iterating through collections and arrays.

Traversing a String

In Java, you cannot use a for-each loop (enhanced for loop) to directly traverse each character of a string because a string is not considered an iterable collection like arrays.

String str = "Hello, World!";
char[] charArray = str.toCharArray();

for (char ch : charArray) {
    System.out.println(ch);
}

// Output:
H 
e 
l 
l 
o 
, 
  
W 
o 
r 
l
d
!

Explanation

1. We first convert the string str into a character array using the toCharArray() method, which splits the string into individual characters.

2. Then, we use a for-each loop to iterate over the characters in the charArray.

3. We have now printed each individual characters of the string

Traversing an Array

double[] numbers = { 1.2, 2.3, 3.4, 4.5, 5.6 };

// Use a for-each loop to traverse the array
for (double num : numbers) {
    System.out.println(num);
}

// Output
1.2
2.3
3.4
4.5
5.6

Explanation

1. We define an array of doubles named numbers.

2. We use a for-each loop to iterate over each element in the numbers array.

3. The loop variable num takes on the value of each element in the array one by one, allowing you to perform operations or print the values as needed.