Question

此代码应该在调用playGame方法时用1和0填充数组gameResult，但是该数组不会填充我尝试分配给它的值，不确定为什么会发生这种情况，我尝试使用整数数组，结果是相同的，但数组仍未填充值。

import java.util.Scanner;



class Main { //Assignment1.java 
  public static void main(String[] args) {
    int number;
    Scanner keyboard = new Scanner(System.in);
    System.out.println("Enter a number from 1-100: ");
    number = keyboard.nextInt();

    playGame(number);


    keyboard.close();

 }
    public static String[] playGame( int chosenNumber ){
      String[] gameResult = new String[9];
      int upper = 100;
      int lower = 1;
      int middle;

      for(int i=0;i<=7;i++){
        middle = (lower+upper)/2;
          if (chosenNumber < middle) {
            gameResult[i]="0";
            upper = middle;
       }
      else{
          gameResult[i]="1";
          lower = middle;
      }    
  }
  System.out.format("Chosen integer %3d: ", chosenNumber);
  System.out.println();
  return gameResult;
}

Answer 1

您没有在任何地方显示或使用数组（您正在为某些索引分配值）我修改了main方法，只是为了打印返回的数组以显示值

class Main { //Assignment1.java
public static void main(String[] args) {
    int number;
    Scanner keyboard = new Scanner(System.in);
    System.out.println("Enter a number from 1-100: ");
    number = keyboard.nextInt();


    String[] arr = playGame(number);
    for (int i = 0; i < arr.length; i++)
        System.out.println(arr[i]);

    keyboard.close();

}

public static String[] playGame(int chosenNumber) {
    String[] gameResult = new String[9];
    int upper = 100;
    int lower = 1;
    int middle;

    for (int i = 0; i <= 7; i++) {
        middle = (lower + upper) / 2;
        if (chosenNumber < middle) {
            gameResult[i] = "0";
            upper = middle;
        } else {
            gameResult[i] = "1";
            lower = middle;
        }
    }
    System.out.format("Chosen integer %3d: ", chosenNumber);
    System.out.println();
    return gameResult;
}

希望有帮助。

字符串数组不会填充值

1 个答案: