[Java] Nowadays, the extended for statement is not exclusively for List, isn't it?

When I did a source review, I was told, "I thought the extended for statement was for List only!", So I'll write here again, "That's not the case."

Try looping the List

Both methods produce the same result.

    List<String> strList = new ArrayList<String>();  //The assignment process to the list element is omitted.

    //Loop the list with a normal for statement.
    for ( int i = 0 ; i < strList.size() ; i++) {
      System.out.println(strList.get(i));
    }
    
    //Loop the list with an extended for statement.
    for (String string : strList) {
      System.out.println(string);
    }

Try looping through the array

The same result is output here as well.

    String[] strArray = new String[5];  //Assignment processing to array elements is omitted.

    //Loop the array with a normal for statement.
    for ( int i = 0 ; i < strArray.length ; i++) {
      System.out.println(strArray[i]);
    }
    
    //Loop the array with an extended for statement.
    for (String string : strArray) {
      System.out.println(string);
    }

How to use it properly

I use it properly depending on whether I want the value of index.

--When you want the value of index: point_right: Ordinary for loop. --You don't need the index value, so when you just want to go around: point_right: Extended for statement.

Personally, I think the source is hard to read when using index. When a long variable name comes out in business, it is usually taken out to a variable once like `` `strList.get (i) ``` in consideration of readability. At the sample level above, it doesn't matter if you extract it to a variable once, but (I) sometimes feel a little annoyed when it comes to business.

Summary

--List loops can be written with ordinary for statements or extended for statements. --The extended for statement can be used for arrays, and ordinary for statements are OK: ok_hand: -(Personally) I use it properly depending on whether I want the index value.