Java How to return a boolean array without getting a weird output like [Z@4517d9a3? [duplicate]

Question

All I'm trying to do is print the elements in a boolean array. But instead of getting the values of the elements which are either true or false, I get a weird output like this [Z@4517d9a3. I have read about the toString but this applies to string arrays. Here is my code :

public class Class{


    public static void main(String[] args) {
        
        boolean a[] =  {true, false, true, false};
        boolean[] x = show(a);
        System.out.println(x);

    }
    
    public static boolean[] show(boolean a[]) {
        
        return a;
    }
}

1) Your show() method does nothing. System.out.println(x); is the same as System.out.println(a);. 2) To print the array, you first need to turn it into a string. See Arrays#toString(). What you're getting right now is the default implementation of the toString() method, which includes the type of the object ([ means it's an array and Z indicates primitive booleans), followed by an @ symbol, followed by the hash code for that particular object (4517d9a3 in your case) — Charlie Armstrong
– Charlie Armstrong, Commented Mar 2, 2021 at 16:45
public static String show(boolean a[]) { return Arrays.toString(a); } but calling Arrays.toString() directly is more adequate IMO (and the name show is a bit confusing here) — user15244370
– user15244370, Commented Mar 2, 2021 at 16:57

dariosicily · Accepted Answer · 2021-03-02 16:56:30Z

1

You can use the Arrays.toString method according to its documentation:

Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(boolean). Returns "null" if a is null.

You can print your boolean array like this:

boolean a[] =  {true, false, true, false};
System.out.println(Arrays.toString(a)); //<-- [true, false, true, false]

answered Mar 2, 2021 at 16:56

dariosicily

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