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can someone please help me to solve this? Thank you

String a = 1||2||3
String b = 2||4||5

String c = 1||2||3||4||5|| //Must be uniqe
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Using converting to arrays or lists? I do not know what your mean. but I suggest

String a = "1||2||3";
String b = "2||4||5";
String[] arrayA = a.split("||");
String[] arrayB = b.split("||");
List<String> list = Arrays.asList(arrayA);
list.addAll(Arrays.asList(arrayB));            
System.console().printf(list.stream().distinct().collect(Collectors.joining("||")));
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