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！

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();
    }

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。