Java Programming by Pearson

586 • Java Programming

List LL = Collections.EMPTY_LIST;

//LL.add(0,”hello”);line generates error

show(“\nLL.isEmpty():” + LL.isEmpty());

Set S = Collections.EMPTY_SET;

//S.add(“hello”);line generates error

show(“\nS.isEmpty():” + S.isEmpty());

Map M = Collections.EMPTY_MAP;

//M.put(“hello”,”bye”);line generates error

show(“\nM.isEmpty():” + M.isEmpty());

}

}

OUTPUT:

LL.isEmpty():true

S.isEmpty():true

M.isEmpty():true

Explanation: The static constants EMPTY_LIST, EMPTY_SET and EMPTY_MAP represent empty

immutable list, set and map, respectively. Rest is simple to understand.

18.12 PONDERABLE ...