gistfile1.java

package tetz42.util;

import static tetz42.util.ObjDumper4j.*;
import java.util.HashMap;

public class Investigation_HashMapBehaviour {

    /**
     * @param args
     */
    public static void main(String[] args) {
        new Investigation_HashMapBehaviour().exe();
    }

    HashMap<String, Object> hm = new HashMap<>();
//    HashMap<String, Object> hm = applicableMap(100);

    private void exe() {
        for (int i = 0; i < 100; i++) {
            System.out.println("-------------------[" + i + "]---------------------");
            hm.put(String.valueOf(i), i);
            System.out.println(inspect(hm));
        }
    }

    public static <K, V> HashMap<K, V> applicableMap(int numberToStore) {
        return applicableMap(numberToStore, (float) 1);
    }

    public static <K, V> HashMap<K, V> applicableMap(int numberToStore, float loadFactor) {
        int applicableNumber = (int) (numberToStore / loadFactor) + 1;
        return new HashMap<K, V>(applicableNumber, loadFactor);
    }

}

/* Like below text will be shown when you perform this program.
-------------------[10]---------------------
HashMap@7f5{
	table = Entry[]@39813c12[
		Entry@30{
			key = "3"
			value = 3
			next = null
			hash = 48
		}
		Entry@30{
			key = "2"
			value = 2
			next = null
			hash = 49
		}
		Entry@615{
			key = "10"
			value = 10
			next = Entry@30{
				key = "1"
				value = 1
				next = null
				hash = 50
			}
			hash = 1650
		}
		Entry@30{
			key = "0"
			value = 0
			next = null
			hash = 51
		}
		Entry@30{
			key = "7"
			value = 7
			next = null
			hash = 52
		}
		Entry@30{
			key = "6"
			value = 6
			next = null
			hash = 53
		}
		Entry@30{
			key = "5"
			value = 5
			next = null
			hash = 54
		}
		Entry@30{
			key = "4"
			value = 4
			next = null
			hash = 55
		}
		null
		null
		Entry@30{
			key = "9"
			value = 9
			next = null
			hash = 58
		}
		Entry@30{
			key = "8"
			value = 8
			next = null
			hash = 59
		}
		null
		null
		null
		null
	]
	size = 11
	threshold = 12
	loadFactor = 0.75
	modCount = 11
	useAltHashing = false
	hashSeed = -1758889794
	entrySet = EntrySet@7f5[
		Entry@30{...}
		Entry@30{...}
		Entry@615{...}
		Entry@30{...}
		Entry@30{...}
		Entry@30{...}
		Entry@30{...}
		Entry@30{...}
		Entry@30{...}
		Entry@30{...}
		Entry@30{...}
	]
	[java.util.AbstractMap]
	keySet = null
	values = null
}
*/