多个List合并去除list中对象的某个属性值相同的对象

 

 

 

List<Car> carList1 = getList1......;
List<Car> carList2 = getList2......;
//以车号作为key
Map<String, Car> carMap = new HashMap<String, Car>();
for(Car car1 : carList1) carMap.put(car1.getNum(), car1);
for(Car car2 : carList2) {
    if(carMap.containsKey(car2 .getNum())){
	carMap.remove(car2 .getNum());//移除键值为车号相等的对象
	continue;//停止并返回继续循环
    }	
    carMap.put(car2.getNum(), car2);
}
//循环map再对map中每个对象进行操作
Iterator<Entry<String, Car>> iter = carMap.entrySet().iterator();
Car entity = null;
while (iter.hasNext()) {
	Map.Entry<String, Car> entry = iter.next();
	entity= entry.getValue();
	......
}

 

 要点：

1、把两个List放到HashMap中

2、在第二个List循环中进行判断