Why does the foreach statement not change the element value?

by

You’re changing the iteration variable c. That doesn’t change the contents of the array. The iteration variable is just a copy of the array element. If you want to modify the array, you need to do so explicitly:

for (int i = 0; i < array.length; i++) {
    if (array[i] == 'o') {
        array[i] = 'a';
    }
}

Your original code is equivalent (as per section 14.14.2 of the JLS) to:

for (int i = 0; i < array.length; i++) {
    char c = array[i];
    if (c == 'o') {
        c="a"; 
    }
}

Changing the value of a local variable will never change anything else – it just changes the local variable. The assignment:

char c = array[i];

copies the value in the array into a local variable. It doesn’t associate the local variable with the array element perpetually.

More Related Contents:

  1. How does the Java ‘for each’ loop work?
  2. Calling remove in foreach loop in Java [duplicate]
  3. Why am I not getting a java.util.ConcurrentModificationException in this example?
  4. Which is more efficient, a for-each loop, or an iterator?
  5. How to avoid java.util.ConcurrentModificationException when iterating through and removing elements from an ArrayList
  6. Is there a way to access an iteration-counter in Java’s for-each loop?
  7. What is the syntax of the enhanced for loop in Java?
  8. Break or return from Java 8 stream forEach?
  9. ConcurrentModificationException when adding inside a foreach loop in ArrayList [duplicate]
  10. Java for loop syntax: “for (T obj : objects)”
  11. Can one do a for each loop in java in reverse order?
  12. How to get a index value from foreach loop in jstl
  13. Initializing an array in Java using the ‘advanced’ for each loop [duplicate]
  14. Last iteration of enhanced for loop in java
  15. forEach vs forEachOrdered in Java 8 Stream
  16. Apache Spark – foreach Vs foreachPartition When to use What?
  17. What are the advantages of Enhanced for loop and Iterator in Java?
  18. Java 8 forEach with index [duplicate]
  19. Why is declaration of the variable required inside a for-each loop in java
  20. How does primitive array work with new for each loop in Java?
  21. What does the colon (:) operator do?
  22. How does the enhanced for statement work for arrays, and how to get an iterator for an array?
  23. How do I apply the for-each loop to every character in a String?
  24. why is the enhanced for loop more efficient than the normal for loop
  25. How to Iterate through HashMap in MyBatis foreach?
  26. Java Modifying Elements in a foreach
  27. For-each vs Iterator. Which will be the better option
  28. Idiomatic way to use for-each loop given an iterator?
  29. How to read from files with Files.lines(…).forEach(…)?
  30. How do I access Android’s default beep sound?

Leave a Comment