CODEWITHSUNDEEP
javadictionarytreemap
user3086529
user3086529

Reputation: 11

Remove Last entry then print it out when map<Integer, String>

Like title says how do I remove the Last entry in a treemap if it's sorted by <Integer, String> since the remove() method in treemap only delete` a key...

Look like this: 

int i = 0;
while (i <= 10) {
    System.out.println("Value is: " + Resultat.lastEntry());
    i++;
    // here, I want to delete the last entry
}

Upvotes: 0

Views: 1784

Answers (4)

Energy
Energy

Reputation: 958

Full code is here

     int j = 0;
    while (j <= 3) {
        Map.Entry<Integer,String> entry = records.pollLastEntry();
        records.remove(entry.getKey());
        j++;
    }

Upvotes: 0

user2336315
user2336315

Reputation: 16067

Why don't you use pollLastEntry() ?

Removes and returns a key-value mapping associated with the greatest key in this map, or null if the map is empty.

public static void main (String[] args) throws java.lang.Exception
{
    TreeMap<Integer, String> testTreeMap = new TreeMap<>();

    //Populate example map with values
    testTreeMap.put(1,"Test");
    testTreeMap.put(0, "Test0");
    testTreeMap.put(6, "Test6");
    testTreeMap.put(4, "Test4");
    testTreeMap.put(2, "Test2");
    testTreeMap.put(3, "Test3");
    testTreeMap.put(5, "Test5");

    int i = 0;
    while (i <= 3) {
        System.out.println("Value is: " + testTreeMap.pollLastEntry());
        i++;
    }

    System.out.println(testTreeMap);
}

Output :

Value is: 6=Test6
Value is: 5=Test5
Value is: 4=Test4
Value is: 3=Test3
{0=Test0, 1=Test, 2=Test2}

Upvotes: 0

Masudul
Masudul

Reputation: 21961

Use NavigableMap.pollLastEntry -removes and returns a key-value mapping associated with the greatest key in this map, or null if the map is empty.

NavigableMap<Integer, String> map=new  TreeMap<>();
map.put(1, "one");
System.out.println(map);

map.pollLastEntry(); // It wil remove last entry.
System.out.println(map);

Upvotes: 1

Ruchira Gayan Ranaweera
Ruchira Gayan Ranaweera

Reputation: 35557

You can just use map.remove(); if you know the key of the last key value pair. 

Map<Integer,String> map=new TreeMap<>();
map.remove("key");// key of last entry.

Upvotes: 0

Related Questions