HashMap 分析

package mars.test;

import mars.test.HashMap.Entry;

public class Testhashmap {

	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		float loadFactor=0.75f;
		int loop=100;
		HashMap map = new HashMap(16, loadFactor);

		for (int i = 0; i < loop; i++) {
			map.put(i + ""+i, i); //indexFor(hash, table.length);
		}		
		
		int one=0;
		int two=0;
		int three=0;
		int gtthree=0;
		StringBuilder buffer=new StringBuilder();
		
		for (int i = 0; i < map.getTable().length; i++) {
			Entry e = map.getTable()[i];
			
			if (e != null && e.next != null) {
				int count=1;
				buffer.append("table[" + i + "]=\n");
				while (e.next != null){
					buffer.append("  e.hash="+e.hash);
					buffer.append("  e.value="+e.value+"\n");
					e = e.next;
					count++;
				}
				
				buffer.append("  e.hash="+e.hash);
				buffer.append("  e.value="+e.value+"\n");
				
				switch(count){
				case 2:{
					two++;
					break;
				}
				case 3:{
					three++;
					break;
				}
				default:
				gtthree++;
				}
			}else if(e!=null){
				one++;
			}
		}
		
		System.out.println(" ======================================================");
		System.out.println(" loadFactor="+loadFactor);
		System.out.println(" loop="+loop);
		
		System.out.println(" map table len="+map.getTable().length);
		System.out.println(" map len="+map.size());
		System.out.println(" one entry count= "+one);
		System.out.println(" two entries count= "+two);
		System.out.println(" three entries count= "+three);
		System.out.println(" greate than three entries count= "+gtthree);
		System.out.println(" ======================================================");
		System.out.println(buffer.toString());
	}

}