书名：代码本色：用编程模拟自然系统作者：DanielShiffman译者：周晗彬ISBN：978-7-115-36947-5目录4.8　用继承实现粒子类  在粒子类上实践继承的用法。1、简单的Particle类classParticle{PVectorposition;PVectorvelocity;PVectoracceleration;Particle(PVectorl){acceleration=newPVector(0,0.05);velocity=newPVector(random(-1,1),random(-1,0));position=l.get();}voidrun(){upd

书名：代码本色：用编程模拟自然系统作者：DanielShiffman译者：周晗彬ISBN：978-7-115-36947-5目录4.8　用继承实现粒子类  在粒子类上实践继承的用法。1、简单的Particle类classParticle{PVectorposition;PVectorvelocity;PVectoracceleration;Particle(PVectorl){acceleration=newPVector(0,0.05);velocity=newPVector(random(-1,1),random(-1,0));position=l.get();}voidrun(){upd