慢慢理解一下先把

package searchstudent;

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Scanner;
/**

 * 成绩统计

 *

 * */
public class score {
     public static Scanner scann=new Scanner(System.in);
     public static void main(String[] args) {
            //输入课程数
         int x;
         
         lei l=new lei();
         System.out.println("课程数:");
          x=scann.nextInt();
          String []km=new String[x];
        
         
           for(int i=0;i<km.length;i++)
              {
                 System.out.println("输入科目:");
                 km[i]=scann.next();
             }
           l.setKemu(km);
           int [] cj=new int[x];
            //输入成绩
              for(int i=0;i<km.length;i++){
               System.out.println("输入"+km[i]+"成绩:");
                cj[i] =scann.nextInt();
            }
            l.setChengji(cj);
            System.out.println(Arrays.toString(l.getKemu()));
            System.out.println(Arrays.toString(l.getChengji()));
}
}

package searchstudent;

public class lei {
      private int []chengji;
      private String [] kemu;//存储数据；
   
    public int[] getChengji() {
        return chengji;
    }
    public void setChengji(int[] chengji) {
        this.chengji = chengji;
    }
    public String[] getKemu() {
        return kemu;
    }
    public void setKemu(String[] kemu) {
        this.kemu = kemu;
    }  
}