Java：在未排序的整数数组中搜索用户输入的整数的第一个匹配项_Java_Arrays_Loops_Methods_Java.util.scanner

Java：在未排序的整数数组中搜索用户输入的整数的第一个匹配项

java arrays loops methods

Java：在未排序的整数数组中搜索用户输入的整数的第一个匹配项,java,arrays,loops,methods,java.util.scanner,Java,Arrays,Loops,Methods,Java.util.scanner,我注意到两个问题，非常感谢您的帮助（我相信）方法“arrayIndex”和“position”是如何相互作用的。我这样说是因为当我为两个字段输入相同的精确数字时，它们返回相同的精确值，即使它们应该处理完全不同的任务我的“position”方法应该返回数组中第一次出现的搜索值的位置，但它似乎返回了不正确的值，检查后我仍然无法找出原因。如果用户搜索不存在的值位置，则应返回“-1” 我的全部代码： import java.util.Scanner; public class Prog9Array

我注意到两个问题，非常感谢您的帮助

（我相信）方法“arrayIndex”和“position”是如何相互作用的。我这样说是因为当我为两个字段输入相同的精确数字时，它们返回相同的精确值，即使它们应该处理完全不同的任务

我的“position”方法应该返回数组中第一次出现的搜索值的位置，但它似乎返回了不正确的值，检查后我仍然无法找出原因。如果用户搜索不存在的值位置，则应返回“-1”

我的全部代码：

import java.util.Scanner;

public class Prog9ArrayMethods {

    public static void main(String[] args) {
        // Daily high temperatures for Portland Maine Jan 1 - Dec 31 2015
        int[] tmax = {32, 38, 34, 35, 41, 17, 25, 17, 29, 24, 26, 33, 31, 24, 
                      29, 38, 20, 49, 49, 36, 31, 38, 35, 32, 37, 20, 17, 26, 
                      30, 32, 22, 26, 12, 20, 35, 34, 19, 28, 22, 15, 30, 23, 
                      20, 17, 16, 19, 21, 21, 32, 33, 19, 34, 35, 31, 19, 34, 
                      21, 27, 27, 30, 36, 32, 46, 39, 23, 38, 40, 44, 47, 56, 
                      41, 39, 38, 36, 45, 44, 28, 32, 34, 36, 35, 34, 39, 42, 
                      49, 49, 41, 41, 40, 48, 45, 46, 66, 49, 48, 41, 47, 42, 
                      35, 43, 54, 68, 66, 70, 65, 55, 67, 55, 57, 48, 63, 60, 
                      53, 54, 55, 56, 58, 63, 57, 60, 55, 54, 62, 76, 75, 72, 
                      84, 58, 59, 83, 68, 82, 64, 68, 70, 63, 74, 61, 65, 67, 
                      69, 67, 65, 83, 84, 91, 79, 80, 77, 84, 73, 51, 50, 61, 
                      60, 58, 73, 67, 65, 68, 81, 86, 80, 85, 78, 61, 61, 75, 
                      72, 80, 69, 72, 72, 67, 82, 78, 67, 70, 59, 69, 75, 68, 
                      78, 80, 71, 82, 82, 76, 84, 72, 84, 87, 90, 78, 76, 82, 
                      76, 74, 70, 81, 84, 70, 82, 78, 76, 67, 67, 77, 83, 88, 
                      86, 86, 86, 81, 81, 80, 82, 80, 76, 80, 77, 77, 67, 80, 
                      77, 80, 85, 85, 89, 86, 83, 75, 73, 78, 70, 79, 75, 80, 
                      79, 77, 75, 81, 86, 80, 84, 86, 72, 78, 82, 92, 89, 86, 
                      78, 73, 74, 62, 73, 83, 85, 82, 83, 75, 72, 69, 65, 74, 
                      74, 63, 63, 67, 74, 75, 69, 62, 55, 58, 58, 61, 69, 67, 
                      63, 59, 56, 68, 70, 62, 68, 57, 61, 57, 46, 48, 66, 58, 
                      65, 54, 47, 62, 54, 52, 59, 73, 58, 51, 58, 64, 64, 64, 
                      68, 69, 65, 53, 58, 53, 47, 53, 60, 46, 53, 54, 47, 47, 
                      53, 59, 46, 42, 42, 42, 41, 51, 61, 57, 41, 32, 38, 44, 
                      45, 47, 51, 51, 57, 39, 45, 53, 48, 57, 47, 48, 56, 42, 
                      50, 46, 40, 38, 47, 49, 47, 51, 62, 51, 43, 34, 23, 28, 
                      44};

        int max = arrayMax(tmax);
        int min = arrayMin(tmax);
        double average = arrayAverage(tmax);
        int count = arrayIndex(tmax);
        int i = arrayIndex(tmax);
        System.out.println("Maximum value is: " + max);
        System.out.println("Minimum value is: " + min);
        System.out.println("Average value is: " + average);
        System.out.println("The number of values above the specified value is: " + count);
        System.out.println("The first occurence of the searched value is: " + i);
    }

    // Returns the maximum value in the array
    public static int arrayMax(int[] a) {
        int max = a[0];

        for (int i = 0; i < a.length; i++)
            if (a[i] > max)
                max = a[i];

        return max; 
    }
    // Returns the minimum value in the array
    public static int arrayMin (int[] a) {
        int min = a[0];    

            for (int i = 0; i < a.length; i++)
                if (a[i] < min)
                    min = a[i];
            return min;
    }
    // Returns the average value in the array
    public static double arrayAverage(int[] a) {  
        int sum = 0; // Why does it double the decimal value with "int sum = a[0]"?
        double average;

            for(int i=0; i < a.length; i++){
                sum = sum + a[i];
            }
            average = (double)sum/a.length;
            return average;
    }
    // Returns the number of values greater than the user's indexed values
    public static int arrayIndex(int[] a) {

        Scanner user_input = new Scanner( System.in );
        System.out.println("Enter a value to search: ");
        int userSearch = user_input.nextInt(); 

        int count = 0;

            for(int i = 0; i < a.length; i++) {
                if(a[i] > userSearch) {
                    ++count;
                }
            }
            return count;
    }
    public static int position(int [ ] a, int match) {
        Scanner user_input = new Scanner( System.in );
        System.out.println("Enter a value to search: ");
        int userSearch = user_input.nextInt(); 

        for (int i = 0; i < a.length; i++)
          {
               if ( a[i] == userSearch )
                     return i;
          }
         return -1;
    }
}

import java.util.Scanner；
公共类Prog9ArrayMethods{
公共静态void main（字符串[]args）{
//缅因州波特兰市2015年1月1日至12月31日的每日高温
int[]tmax={32,38,34,35,41,17,25,17,29,24,26,33,31,24，
29, 38, 20, 49, 49, 36, 31, 38, 35, 32, 37, 20, 17, 26, 
30, 32, 22, 26, 12, 20, 35, 34, 19, 28, 22, 15, 30, 23, 
20, 17, 16, 19, 21, 21, 32, 33, 19, 34, 35, 31, 19, 34, 
21, 27, 27, 30, 36, 32, 46, 39, 23, 38, 40, 44, 47, 56, 
41, 39, 38, 36, 45, 44, 28, 32, 34, 36, 35, 34, 39, 42, 
49, 49, 41, 41, 40, 48, 45, 46, 66, 49, 48, 41, 47, 42, 
35, 43, 54, 68, 66, 70, 65, 55, 67, 55, 57, 48, 63, 60, 
53, 54, 55, 56, 58, 63, 57, 60, 55, 54, 62, 76, 75, 72, 
84, 58, 59, 83, 68, 82, 64, 68, 70, 63, 74, 61, 65, 67, 
69, 67, 65, 83, 84, 91, 79, 80, 77, 84, 73, 51, 50, 61, 
60, 58, 73, 67, 65, 68, 81, 86, 80, 85, 78, 61, 61, 75, 
72, 80, 69, 72, 72, 67, 82, 78, 67, 70, 59, 69, 75, 68, 
78, 80, 71, 82, 82, 76, 84, 72, 84, 87, 90, 78, 76, 82, 
76, 74, 70, 81, 84, 70, 82, 78, 76, 67, 67, 77, 83, 88, 
86, 86, 86, 81, 81, 80, 82, 80, 76, 80, 77, 77, 67, 80, 
77, 80, 85, 85, 89, 86, 83, 75, 73, 78, 70, 79, 75, 80, 
79, 77, 75, 81, 86, 80, 84, 86, 72, 78, 82, 92, 89, 86, 
78, 73, 74, 62, 73, 83, 85, 82, 83, 75, 72, 69, 65, 74, 
74, 63, 63, 67, 74, 75, 69, 62, 55, 58, 58, 61, 69, 67, 
63, 59, 56, 68, 70, 62, 68, 57, 61, 57, 46, 48, 66, 58, 
65, 54, 47, 62, 54, 52, 59, 73, 58, 51, 58, 64, 64, 64, 
68, 69, 65, 53, 58, 53, 47, 53, 60, 46, 53, 54, 47, 47, 
53, 59, 46, 42, 42, 42, 41, 51, 61, 57, 41, 32, 38, 44, 
45, 47, 51, 51, 57, 39, 45, 53, 48, 57, 47, 48, 56, 42, 
50, 46, 40, 38, 47, 49, 47, 51, 62, 51, 43, 34, 23, 28, 
44};
int max=阵列最大值（tmax）；
int min=arrayMin（tmax）；
双倍平均值=阵列平均值（tmax）；
整数计数=阵列索引（tmax）；
int i=阵列索引（tmax）；
System.out.println（“最大值为：“+max”）；
System.out.println（“最小值为：“+min”）；
System.out.println（“平均值为：“+平均值”）；
System.out.println（“高于指定值的值的数量为：“+count”）；
System.out.println（“搜索值的第一次出现是：“+i”）；
}
//返回数组中的最大值
公共静态int数组最大值（int[]a）{
int max=a[0]；
for（int i=0；imax）
max=a[i]；
返回最大值；
}
//返回数组中的最小值
公共静态int-arrayMin（int[]a）{
int min=a[0]；
for（int i=0；iuserSearch）{
++计数；
}
}
返回计数；
}
公共静态int位置（int[]a，int匹配）{
扫描仪用户输入=新扫描仪（System.in）；
System.out.println（“输入要搜索的值：”）；
int userSearch=user_input.nextInt（）；
for（int i=0；i

在main方法中，当您希望得到

作为计数时，实际上得到的是

arrayIndex（）

而不是

position（）

。

只需更改

inti=arrayIndex（tmax）至int i=位置（tmax）
并去掉int match（）
作为position（）
的参数，以下是问题的解决方案。您正在两次调用arrayIndex方法，而不是调用position方法。我修正了你的密码。现在它工作得很好
import java.util.Scanner;

公共类Prog9ArrayMethods{
public static void main(String[] args) {
    // Daily high temperatures for Portland Maine Jan 1 - Dec 31 2015
    int[] tmax = {32, 38, 34, 35, 41, 17, 25, 17, 29, 24, 26, 33, 31, 24, 
                  29, 38, 20, 49, 49, 36, 31, 38, 35, 32, 37, 20, 17, 26, 
                  30, 32, 22, 26, 12, 20, 35, 34, 19, 28, 22, 15, 30, 23, 
                  20, 17, 16, 19, 21, 21, 32, 33, 19, 34, 35, 31, 19, 34, 
                  21, 27, 27, 30, 36, 32, 46, 39, 23, 38, 40, 44, 47, 56, 
                  41, 39, 38, 36, 45, 44, 28, 32, 34, 36, 35, 34, 39, 42, 
                  49, 49, 41, 41, 40, 48, 45, 46, 66, 49, 48, 41, 47, 42, 
                  35, 43, 54, 68, 66, 70, 65, 55, 67, 55, 57, 48, 63, 60, 
                  53, 54, 55, 56, 58, 63, 57, 60, 55, 54, 62, 76, 75, 72, 
                  84, 58, 59, 83, 68, 82, 64, 68, 70, 63, 74, 61, 65, 67, 
                  69, 67, 65, 83, 84, 91, 79, 80, 77, 84, 73, 51, 50, 61, 
                  60, 58, 73, 67, 65, 68, 81, 86, 80, 85, 78, 61, 61, 75, 
                  72, 80, 69, 72, 72, 67, 82, 78, 67, 70, 59, 69, 75, 68, 
                  78, 80, 71, 82, 82, 76, 84, 72, 84, 87, 90, 78, 76, 82, 
                  76, 74, 70, 81, 84, 70, 82, 78, 76, 67, 67, 77, 83, 88, 
                  86, 86, 86, 81, 81, 80, 82, 80, 76, 80, 77, 77, 67, 80, 
                  77, 80, 85, 85, 89, 86, 83, 75, 73, 78, 70, 79, 75, 80, 
                  79, 77, 75, 81, 86, 80, 84, 86, 72, 78, 82, 92, 89, 86, 
                  78, 73, 74, 62, 73, 83, 85, 82, 83, 75, 72, 69, 65, 74, 
                  74, 63, 63, 67, 74, 75, 69, 62, 55, 58, 58, 61, 69, 67, 
                  63, 59, 56, 68, 70, 62, 68, 57, 61, 57, 46, 48, 66, 58, 
                  65, 54, 47, 62, 54, 52, 59, 73, 58, 51, 58, 64, 64, 64, 
                  68, 69, 65, 53, 58, 53, 47, 53, 60, 46, 53, 54, 47, 47, 
                  53, 59, 46, 42, 42, 42, 41, 51, 61, 57, 41, 32, 38, 44, 
                  45, 47, 51, 51, 57, 39, 45, 53, 48, 57, 47, 48, 56, 42, 
                  50, 46, 40, 38, 47, 49, 47, 51, 62, 51, 43, 34, 23, 28, 
                  44};

    int max = arrayMax(tmax);
    int min = arrayMin(tmax);
    double average = arrayAverage(tmax);
    int count = arrayIndex(tmax);
    int i = position(tmax);
    System.out.println("Maximum value is: " + max);
    System.out.println("Minimum value is: " + min);
    System.out.println("Average value is: " + average);
    System.out.println("The number of values above the specified value is: " + count);
    System.out.println("The first occurence of the searched value is: " + i);
}

// Returns the maximum value in the array
public static int arrayMax(int[] a) {
    int max = a[0];

    for (int i = 0; i < a.length; i++)
        if (a[i] > max)
            max = a[i];

    return max; 
}
// Returns the minimum value in the array
public static int arrayMin (int[] a) {
    int min = a[0];    

        for (int i = 0; i < a.length; i++)
            if (a[i] < min)
                min = a[i];
        return min;
}
// Returns the average value in the array
public static double arrayAverage(int[] a) {  
    int sum = 0; // Why does it double the decimal value with "int sum = a[0]"?
    double average;

        for(int i=0; i < a.length; i++){
            sum = sum + a[i];
        }
        average = (double)sum/a.length;
        return average;
}
// Returns the number of values greater than the user's indexed values
public static int arrayIndex(int[] a) {

    Scanner user_input = new Scanner( System.in );
    System.out.println("Enter a value to search for arrayIndex: ");
    int userSearch = user_input.nextInt(); 

    int count = 0;

        for(int i = 0; i < a.length; i++) {
            if(a[i] > userSearch) {
                ++count;
            }
        }
        return count;
}
public static int position(int [ ] a) {
    Scanner user_input = new Scanner( System.in );
    System.out.println("Enter a value to search: ");
    int userSearch = user_input.nextInt(); 

    for (int i = 0; i < a.length; i++)
      {
           if ( a[i] == userSearch )
                 return i;
      }
     return -1;
}

publicstaticvoidmain（字符串[]args）{
//缅因州波特兰的每日高温