Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.lang.reflect.Field;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class Main {

    public static <K, V> Map<K, V> listToMap(List<V> list, String key) {
        return collectionToMap(list, key);
    }

    public static <K, V> Map<K, V> collectionToMap(Collection<V> collection, String key) {
        Map<K, V> map = null;
        Iterator<V> iterator = collection.iterator();
        try {
            if (key == null)
                throw new Exception("no key filed");
            else {
                map = new HashMap<K, V>();
                while (iterator.hasNext()) {
                    V v = iterator.next();
                    Class<? extends Object> c = v.getClass();
                    Field field = c.getField(key);
                    field.setAccessible(true);
                    map.put((K) field.get(v), v);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;
    }
}