Q) create java stream for hard coded source

A : use Stream.of()

eg: Stream<Integer> stream= Stream.of(1,2,3,4);

Q) Arrays from java.unit , useful methods

A 1) Arrays.asList - create list from hard code value

asList(...arg)= return new ArrayList<>(arg) // ... operator -/. list of arguments converting to array

eg:    Collection<String> collection= Arrays.asList("ABC","WSZ"); 

String[] s= new String[]{"dasda","Dasdas"};
        Collection<String> collection1= Arrays.asList(s);

String

Q) get character at position from string

"abc".charAt(0)