在介绍java编程时，我对第一个java实验室的理解如何？我的代码是否正确？

Question

// Create a method called displayHighScorePosition
// it should a players name as a parameter, and the 2nd parameter as a position in the high score table
// You should display the player's name along with a message like " managed to get into position " and the
// position they got and a further message " on the high score table".
//
// Create a 2nd method called calculateHighScorePosition
// it should be sent one argument only, the player score
// it should return an in
// the return data should be
// 1 if the score is >=1000
// 2 if the score is >=500 and < 1000
// 3 if the score is >=100 and < 500
// 4 in all other cases
// call both methods and display the results of the following
// a score of 1500, 900, 400 and 50

    public class Challenge {
        public static void main(String[] args) {


      int position=calculateHighScorePosition(1500);
      displayHighScorePosition("Stone",position);
      position=calculateHighScorePosition(900);
      displayHighScorePosition("shawn",position);
      position=calculateHighScorePosition(400);
      displayHighScorePosition("Simon",position);
      position=calculateHighScorePosition(50);
      displayHighScorePosition("sks",position);   }


        public static void displayHighScorePosition(String playerName, int position) {
            System.out.println(playerName + " managed to get into position");
            System.out.println(position + " on the high score table");
        }

        public static int calculateHighScorePosition(int playerScore) {
           if(playerScore>1000){
               return 1;
           }else if(playerScore>500&&playerScore<1000) {
               return 2;
           }else if(playerScore>100&&playerScore<500) {
               return 3;
           }else {
               return 4;
           }
           }

        }

Answer 1

编辑后，基本程序似乎没问题，但需要注意以下几点：

返回数据应该是 如果得分> = 1000，则为1 如果得分> = 500且<1000，则为2 如果得分> = 100且<500，则为3 在所有其他情况下为4

但目前的测试省略了测试的=部分。例如，尝试运行分数等于500的测试用例。结果如何？

所以检查应该如下所示，结合=和来自@JohnyMopp的注释，不需要超出&&的部分：

if(playerScore >= 1000){
       return 1;
} else if (playerScore >= 500) {
       return 2;
} else if (playerScore >= 100) {
       return 3;
} else {
       return 4;
}

在边界处编写一些测试用例是确保程序逻辑正确运行的最佳方法。因此，除了指定的结果外，还要在1000,500,100,499,99处添加一些测试。基本上，开始考虑可能影响结果的极端情况。

这里有一些标准示例：https://ideone.com/sGi48C