Java LinkedHashMap.

How to limit the maximum size of a Map by removing oldest entries when limit reached?

        int MAX_SIZE = 5;
        LinkedHashMap map = new LinkedHashMap<String, String[]>() {
            @Override
            protected boolean removeEldestEntry(final Map.Entry eldest) {
                return size() > MAX_SIZE;
            }
        }; 

Example:

package zdemo;

import java.util.LinkedHashMap;
import java.util.Map;

public class ZDemo {
    public static void main(String[] args) {
        int MAX_SIZE = 5;
        LinkedHashMap map = new LinkedHashMap<String, String[]>() {
            @Override
            protected boolean removeEldestEntry(final Map.Entry eldest) {
                return size() > MAX_SIZE;
            }
        };

        map.put("1", "x");
        System.out.println(map);
        map.put("2", "x");
        System.out.println(map);
        map.put("3", "x");
        System.out.println(map);
        map.put("4", "x");
        System.out.println(map);
        map.put("5", "x");
        System.out.println(map);
        map.put("6", "x");
        System.out.println(map);
        map.put("7", "x");
        System.out.println(map);
        map.put("8", "x");
        System.out.println(map);
        map.put("9", "x");
        System.out.println(map);
        map.put("10", "x");
        System.out.println(map);
    }
}

Output:

run:
{1=x}
{1=x, 2=x}
{1=x, 2=x, 3=x}
{1=x, 2=x, 3=x, 4=x}
{1=x, 2=x, 3=x, 4=x, 5=x}
{2=x, 3=x, 4=x, 5=x, 6=x}
{3=x, 4=x, 5=x, 6=x, 7=x}
{4=x, 5=x, 6=x, 7=x, 8=x}
{5=x, 6=x, 7=x, 8=x, 9=x}
{6=x, 7=x, 8=x, 9=x, 10=x}
BUILD SUCCESSFUL (total time: 0 seconds)