写了一段代码，老出错，没看出错在哪里，系统提示错误很多，求大神解惑

Question

Map hashmapCollection Scanner

Answer 1

编译时提示的前18个错误，全部和Num.put(1,"1.T恤"); prices.put(1,"$20");
     Num.put(2,"2.网球鞋"); prices.put(2,"$50");
     Num.put(3,"3.网球拍");  prices.put(3,"$100");这几句话有关，如下：
TestDemo.java:10: 错误: 需要<标识符>
         Num.put(1,"1.T恤"); prices.put(1,"$20");
                ^
TestDemo.java:10: 错误: 非法的类型开始
         Num.put(1,"1.T恤"); prices.put(1,"$20");
                 ^
TestDemo.java:10: 错误: 非法的类型开始
         Num.put(1,"1.T恤"); prices.put(1,"$20");

Answer 2

上面的解决了，因为属性调用要写在方法内。
新问题出现了：TestDemo.java:34: 错误: 对于Scanner(PrintStream), 找不到合适的构造器
                    int i=new Scanner(System.out).nextInt();

Answer 3

终于改好了
import java.util.Scanner;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;class Test
{
public  static Map<Integer,String> Num=new HashMap<Integer,String>();
public  static Map<Integer,String> prices=new HashMap<Integer,String>();
//  Num.put(1,"1.T恤"); prices.put(1,"$20");
//     Num.put(2,"2.网球鞋"); prices.put(2,"$50");
//     Num.put(3,"3.网球拍");  prices.put(3,"$100");
    
public void print(String str)
{
System.out.println(str);
}

};
public class TestDemo
{
public static void main(String args[])
{
Test test=new Test();
test.Num.put(1,"1.T恤"); test.prices.put(1,"$20");
        test.Num.put(2,"2.网球鞋"); test.prices.put(2,"$50");
        test.Num.put(3,"3.网球拍");  test.prices.put(3,"$100");
boolean bool=true;
while(bool)
{
    test.print("------------------");
Collection coll=Test.Num.values();
    test.print(coll.toString());
    test.print("请输入要查找的商品：");
    int i=new Scanner(System.in).nextInt();
    test.print("你输入的数字是"+i);
test.print("商品价格:"+Test.prices.get(i));
    test.print("是否继续查找Y/N ?");
            String again=new Scanner(System.in).nextLine();
if(again.equals("N") || again.equals("n"))
{
               bool = false;
    }
}

}
}