How can this same result be achieved via a foreach loop in Java

Question

I am trying to make a DeleteRecord() that takes any number of String[][] type arguments. I have made a sort of test function just to see what kind of logice iwould need to apply to make that function. I made it work but I want to use a foreach loop. how can I do that. I have this code:

public void testSomething(String[][]... enteredStrings) {
        for (int i = 0; i < enteredStrings[0].length; i++) {
            for (int j = 0; j < enteredStrings[0][i].length; j++) {
                System.out.println("i -> " + i + " " + "j -> " + j + " " + enteredStrings[0][i][j]);
            }
        }
    }

I know how to make foreach loop in java but I can't do it with a multidimensional array. Thanks in advance.

If you intend on modifying the elements (since I see that you want to make a DeleteRecord()), your innermost loop should not be a foreach loop, otherwise the arrays won't be modified. — trutheality
– trutheality, Commented Jun 5, 2011 at 18:16

SLaks · Accepted Answer · 2011-06-05 16:57:51Z

4

You need to loop through the String[]s in the outer array of strings-arrays:

for (String[] arr : enteredStrings) {
    for (String str : arr) {
        ...
    }
}

answered Jun 5, 2011 at 16:57

SLaks

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9 Comments

Thomas Owens Over a year ago

The biggest hitch with a for-each loop given the provided code will be the third println. You are using the indices there, so if you need to maintain that line the way it is, you'll have to start with this and continue to track where you are.

prometheuspk Over a year ago

@SLaks i think you are forgetting the part where testSomething() is a variadic type

Mike M Over a year ago

I think Thomas is right here. Any time you need to keep track of the indices, you might as well just use a standard for loop.

Taylor Over a year ago

I think enteredStrings is actually a 3d array.

prometheuspk Over a year ago

yes it is. Eclipse shows a tooltip like this String[][][] enteredStrings. and my code body also shows that.

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jhlu87 · Accepted Answer · 2011-06-05 18:09:05Z

0

For a 3D array with your setup the code below will print the contents of the array. However, I'm not sure how you get the indices with a for each.

public void test2(String[][]... enteredStrings){
    for (String[] iii : enteredStrings[0]){
        for (String jjj: iii){
            System.out.println(jjj);
        }
    }
}

answered Jun 5, 2011 at 18:09

jhlu87

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