问题描述

请问这个代码对吗？谢谢

import java.util.*;
class car{
private int passengers;
private double weight;
private String color;
public void input(){
Scanner sin=new Scanner(System.in);
System.out.println(""请输入汽车的载客人数:"");
passengers=sin.nextInt();
System.out.println(""请输入汽车的重量(吨):"");
weight=sin.nextDouble();
System.out.println(""请输入汽车的颜色:"");
color=sin.next();
}
public int getPassengers() {
return passengers;
}
public void setPassengers(int passengers) {
this.passengers = passengers;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}

}
public class lx2 {
public static void main(String[] args){
car a1=new car();
System.out.println(""请输入汽车对象的属性值:"");
a1.input();
System.out.println(""请输入第一辆车对象的信息如下:"");
System.out.println(""汽车的载客人数为:""+a1.getPassengers()+"";重量为:""+a1.getWeight()+""(吨);颜色为:""+a1.getColor());
car a2=new car();
a2.input();
System.out.println(""请输入汽车对象的属性值:"");
System.out.println(""请输入第一辆车对象的信息如下:"");
System.out.println(""汽车的载客人数为:""+a2.getPassengers()+"";重量为:""+a2.getWeight()+""(吨);颜色为:""+a2.getColor());
}

}
这个代码对吗？谢谢！

解决方案

对呀，碰到什么问题了吗？这代码没错。
不过既然是封装的练习，那
System.out.println(""汽车的载客人数为:""+a1.getPassengers()+"";重量为:""+a1.getWeight()+""(吨);颜色为:""+a1.getColor());应该作为一个方法放到类中

 class car{    private int passengers;    private double weight;    private String color;    private static int nums = 0;    private String CHN_NUMS[]={""零""一""二""};    public void input(){        nums++;        System.out.println(""请输入""+CHN_NUMS[nums]+""汽车对象的属性值:"");        Scanner sin=new Scanner(System.in);        System.out.println(""请输入汽车的载客人数:"");        passengers=sin.nextInt();        System.out.println(""请输入汽车的重量(吨):"");        weight=sin.nextDouble();        System.out.println(""请输入汽车的颜色:"");        color=sin.next();        this.print();    }    public void print(){        System.out.println(""请输入""+CHN_NUMS[nums]+""汽车对象的信息如下:"");        System.out.print(""汽车载客人数为:""+this.passengers+"";"");        System.out.print(""重量为""+this.weight+""吨;"");        System.out.println(""颜色为""+this.color);    }    public int getPassengers() {        return passengers;    }    public void setPassengers(int passengers) {        this.passengers = passengers;    }    public double getWeight() {        return weight;    }    public void setWeight(double weight) {        this.weight = weight;    }    public String getColor() {        return color;    }    public void setColor(String color) {        this.color = color;    }}

然后调用

 public static void main(String arg[]){        car a1=new car();               a1.input();        car a2=new car();        a2.input();    }

解决方案二：
public void input(){
Scanner sin=new Scanner(System.in);
System.out.println(""请输入汽车的载客人数:"");
passengers=sin.nextInt();
System.out.println(""请输入汽车的重量(吨):"");
weight=sin.nextDouble();
System.out.println(""请输入汽车的颜色:"");
color=sin.next();
}

这段代码可以调整一下，set方法赋值。另外应该跟控制台相关的代码应该放到Main方法里面去。