11.按要求编写Java应用程序。 (1)创建一个叫做机动车的类: 属性:车牌号(String),车速(int),载重量(double) 功能:加速(车速自增)、减速(车速自减)、修改车牌号,查询车的载重量。 编写两个构造方法:一个没有形参,在方法中将车牌号设置“XX1234”,速 度设置为100,载重量设置为100;另 一个能为对象的所有属性赋值; (2)创建主类: 在主类中创建两个机动车对象。
package java1; public class Che { //属性 public String nub; public int speed; public double weight ; Che() { nub="XX1234"; speed=100; weight=100; } Che(String nub, int speed,double weight) { this.nub = nub; this.speed = speed; this.weight = weight; } public int add(int add) { System.out.println("车速增加"+add+"当前车速为:"+(speed+add)); return speed; } public int jian(int jian) { System.out.println("车速减"+jian+"当前车速为:"+(speed-jian)); return speed; } public String setNub(String nub) { this.nub=nub; System.out.println("当前车牌为"+nub); return nub; } public double setWeight(double weight) { this.weight=weight; System.out.println("当前载重"+weight); return weight; } } Che che1=new Che(); che1.setNub("辽B5086"); che1.add(20); System.out.println("车牌为:"+che1.nub+",车速为:"+che1.speed+",载重为"+che1.weight); Che che2=new Che("辽B5086",150,200); che2.jian(20); System.out.println("车牌为:"+che2.nub+",车速为:"+che2.speed+",载重为"+che2.weight);
当前车牌为辽B5086
车速增加20当前车速为:120
车牌为:辽B5086,车速为:100,载重为100.0
车速减20当前车速为:130
车牌为:辽B5086,车速为:150,载重为200.0