初学者，希望大神看看有什么问题

import java.util.Scanner;
public class chengji {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("请输入学生的人数：");
        int renshu=in.nextInt();
        System.out.println("请输入学习的科目数：");
        int kemushu=in.nextInt();
        int chengji[][]=new int[renshu][kemushu];
        String student[]=new String[renshu];
        String kemu[]=new String[kemushu];
        for(int i=0;i<kemu.length;i++){
            System.out.println("请输入第"+(i+1)+"科科目名称：");
            kemu[i]=in.next();
        }
        for(int i=0;i<renshu;i++){
            System.out.println("请输入第"+(i+1)+"个学生姓名：");
            student[i]=in.next();
            for(int j=0;j<kemushu;j++){
                System.out.println("请输入"+student[i]+kemu[j]+"的成绩：");
                chengji[i][j]=in.nextInt();
            }
        }
    }
}