recycling : Java Glossary

The drawback is the runtime won’t warn you if you reuse an object without clearing it first. If you always get a new on, NullPointerException will warn you if you fail to allocate.

Plastic Recycling

Resin Plastic Recycling Codes
Resin Code	Technical Name	Typical Uses
	PETE (Polyethylene Terephthalate)	soft drink bottles, deli trays, Mylar film, clear shampoo bottles, mouthwash bottles.
	HDPE (High Density Polyethylene)	Tupperware, milk jugs, dishwashing detergent containers, juice containers, opaque shampoo bottles, oven cleaner bottles, insecticide bottles, yogurt containers
	PVC (Polyvinyl Chloride)	plumbing pipes, construction materials, vinyl records, opaque shampoo bottles,
	LDPE (Low Density Polyethylene)	grocery bags, dry cleaning bags, aquarium tubing.
	PP (Polypropylene)	appliance parts, Tic Tac hinge lids, drinking glasses, mustard squeeze bottles, margarine containers, pudding containers
	PS (Polystyrene)	styrofoam cups.
	Other plastics, including acrylic, polycarbonate, nylon, Kevlar, fiberglass.	compact discs, DVDs.

Disposing of CD (Compact Disk)s and DVD (Digital Video Disk) s

1. Use rewritable CDs and DVRs. You recycle them by reformatting them. When you by them, mark them in a way that you can rapidly tell them apart from write-once discs.
2. Use a $40.00 USD DVD destroyer. It perforates disc with numerous little holes, making a loud pop every time it destroys a CD. There is an USB-powered one for $29.00 USD that breaks up the entire surface in 5 seconds.
3. A $16.00 USD compact disc eraser will make a disc unreadable by deeply scoring it multiple times. I suspect the C.I.A. could extract data, but the discs will certainly not read in an ordinary player.
4. A heavy duty shredder will destroy them. You might buy a heavy duty $200.00 CAD shredder from a stationery store and shred them one by one yourself, and perhaps do a favour by shredding the DVDs and CDs from your friends and family. Wear safety glasses and gloves. CDs and DVDs are brittle and shatter into glass-like shards. The remains go to land fill. Recyclers accept whole discs only.
5. You can ask a friend who owns a heavy duty shredder if you can use his.
6. A pair of tin snips will cut them. This is tedious and hard or your hands if you do more than a dozen or so at a sitting. For extra safety, discard the remains into two different locations.
7. You can incinerate them.
8. The Shred-it people will come to your house and pick them up for $150.00 CAD and incinerate them. That covers 6 banker’s boxes full. Shredding paper is cheaper. You get 15 boxes shredded for the same amount. Unfortunately their shedders don’t handle DVDs and CDs. You might consider collecting CDs and DVDs from others to make up the minimum amount and share the cost.
9. RecyclingCDs or CD Recycling center will recycle your discs for free by taking your old CDs and DVDs and turn them into clocks. They will scratch the surfaces of the CDs before making them into clocks.
10. I am told you can melt them in a microwave, though I have never tried it and I won’t either. Who knows what fumes will come off them!
11. Do not try to destroy a CD or DVD with a hammer. It will shatter like glass after the three layers separate.