Remove all entries in map by value
Java Map is a data structure that holds key->value pairs. In this article we will see how to delete all entries in the map by map values.
Using removeAll
removeAll() takes one argument a collection. And entries matching the passed collection will be removed from the original map
Using removeAll
Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "one");
map.put(2, "two");
map.put(3, "three");
map.put(4, "four");
map.put(5, "five");
map.put(6, "five");
newline("Original Map");
map.values().removeAll(Collections.singleton("five"));
newline("After removing values = five");
map.forEach( (a,b) -> {
System.out.println(a + " -> " + b);
});Output of above program.
Original Map 1 -> one 2 -> two 3 -> three 4 -> four 5 -> five 6 -> five 7 -> five After removing values = five 1 -> one 2 -> two 3 -> three 4 -> four
Using removeIf
removeIf
Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "one");
map.put(2, "two");
map.put(3, "three");
map.put(4, "four");
map.put(5, "five");
map.put(6, "five");
newline("Original Map");
//remove entries where value = five
map.values().removeIf("five"::equals);
newline("After removing values = five");
map.forEach( (a,b) -> {
System.out.println(a + " -> " + b);
});Output of above program.
Original Map 1 -> one 2 -> two 3 -> three 4 -> four 5 -> five 6 -> five 7 -> five After removing values = five 1 -> one 2 -> two 3 -> three 4 -> four
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