The pic is how I did it and run but got some problems, please fix them out

$1.$ In Ship.java, complete the isOverloaded method. This method must return a boolean value

true if the ship is overloaded, and false otherwise. The ship is overloaded if the total weight of

all sacks of grain in its cargo exceeds the ship$$s capacity.

$2.$ In Ship.java, complete the sacksOfGrainType method. This method must return the number of

sacks of grain of the grain type indicated by its parameter that are in the ship$$s cargo. That is$,$ if

the parameter type is Grain.WHEAT and the ship$$s cargo contains $42$ sacks of wheat, the method

should return $42.$

$3.$ In the main$()$ method of CargoSimulator.java, there is an instance of a CargoSimulator object

called sim. As described above, this object contains a list of ships, and each ship contains its list of

cargo. At the location indicated, print out how many sacks of wheat each ship in sim is carrying.

$4.$ In the main$()$ method of CargoSimulator.java, print out a message for each ship in the CargoSimulator

instance sim that is overloaded. If a ship is not overloaded, print nothing.