import *;
import java.util.Scanner;
public class sy2_2 {
    /**
     * @param args
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        Tool tool;
        tool=new Tool("剪刀",2000);
        tool.print();
        tool.set();
        tool.print();
        House house;
        house=new House("普通房子",20,10,3);
        house.print();
        house.set();
        house.print();
    }

}

class Tool{
    String name;
    int date;
    Tool(String name,int data){
        this.name=name;
        this.date=data;
        }
    void print(){
        System.out.println("名称："+name);
        System.out.println("制造年份："+date);
        }
    void set(){
        int choice;
        Scanner read=new Scanner(System.in);
        System.out.print("请选择要设置的属性（1-名称/2-制造年份）：");
        choice=new Scanner(System.in).nextInt();
        if(choice==1){
            System.out.print("名称：");
            read.next(name);
            }
        else{
            System.out.print("制造年份：");
            read.nextInt(date);
            }
        }
    }

class House{
    String name;
    int length,width,high;
    House(String name,int length,int width,int high){
        this.name=name;
        this.length=length;
        this.width=width;
        this.high=high;
    }
    void print(){
        System.out.println("名称："+name);
        System.out.println("长度："+length);
        System.out.println("宽度："+width);
        System.out.println("高度："+high);
    }
    void set() throws IOException {
        char choice;
        Scanner read=new Scanner(System.in);
        System.out.println("请选择要设置的属性（n-名称/l-长度/w-宽度/h-高度）：");
        choice=(char)System.in.read();
        switch(choice){
        case 'n':{System.out.print("名称：");read.next(name);break;}
        case 'l':{System.out.print("长度：");read.nextInt(length);break;}
        case 'w':{System.out.print("宽度：");read.nextInt(width);break;}
        case 'h':{System.out.print("高度：");read.nextInt(high);break;}
        default:System.out.println("输入错误！");
        }
    }
}

运行之后显示以下内容：
名称：剪刀
制造年份：2000
请选择要设置的属性（1-名称/2-制造年份）：1
名称：锤子
Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Unknown Source)
    at java.util.Scanner.next(Unknown Source)
    at java.util.Scanner.next(Unknown Source)
    at Tool.set(sy2_2.java:41)
    at sy2_2.main(sy2_2.java:12)
我是新手，所以不太看懂，还请各位能人出手相助，不胜感激！