Check out example codes for "java collapse string array". It will help you in understanding the concepts better.

Code Example 1

String[] array = {"0","1","2","3","4","5","6","7","8","9"};
String s = String.join(" ", array); //<- (delimiter, target array)
Syste.out.println(s);

Output:
0 1 2 3 4 5 6 7 8 9

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