How to display an array in one line without using the method ToString();-CodePudding

I have an array, for example a[]=[10,5,3,1]. I would like to display the elements of this array as follows: 10, 5, 3, 1 How to display it in one line? without using the method ToString() or other array class built-in methods.

I wanted to write system.out.println (for ...). However, it is not possible to put for as an argument of printing.

CodePudding user response：

You could loop over the array and call System.out.print:

for (int i = 0; i < a.length;   i) {
    System.out.print(i   " ");
}

CodePudding user response：

Answer by Murelink is correct. Another approach uses streams, IntStream specifically.

Arrays
.stream( myIntArray )
.forEach( x -> { System.out.print( x   " ") ; } ) ;

CodePudding user response：

int[] arr = { 10, 5, 3, 1 };

String str = Arrays.stream(arr).mapToObj(String::valueOf)
                   .collect(Collectors.joining(","));
System.out.println(str); // 10,5,3,1

str = Arrays.stream(arr).mapToObj(String::valueOf)
            .collect(Collectors.joining(",", "[", "]"));
System.out.println(str); // [10,5,3,1]