import java.util.Scanner;
public class Cs {
    public static void main(String[] args) {
// TODO Auto-generated method stub

        String s[]=new String[10];
        double d[]=new double[5];
        for(int j=0;j<3;j++)
        {
            Scanner in=new Scanner(System.in);
            System.out.print("输入购买的物品:");
            s[j]=in.nextLine();
            System.out.print("输入物品的单价:");
            d[j]=in.nextDouble();
        }
    }
}

------解决方案--------------------
你这写就没有问题！

import java.util.Scanner;
public class cs {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String s[] = new String[10];
		double d[] = new double[5];
		for (int j = 0; j < 3; j++) {
			System.out.println("输入购买的物品:");
			s[j] = in.nextLine();
			System.out.println("输入物品的单价:");
			d[j] = in.nextDouble();
		}
	}

}


------解决方案--------------------
Java code
import java.util.Scanner;

public class cs {
      public static void main(String args[]) {
      
         
         for ( int i=0 ; i<3 ; i++ )
         {
              Scanner in = new Scanner(System.in);
              String s [] = new String [10];
              double d [] = new double [5];

              System.out.println("输入购买的物品：");
              s[i] = in.nextLine();
              System.out.println("输入物品的单价：");
              d[i] = in.nextDouble();
         }
}

}