为什么我试图在 main 内部调用的方法不起作用？

Question

minGap(array); is not being recognized. I don't know what I have done wrong, but I am sure it is a super simple fix. Trying to figure out if it is something to do with the data type being used or if it has something to do with the arrangement of the line " " added. Any hints?

package Lab8;
import java.util.*;
import java.util.Scanner;
public class Question_One {

    public static void main(String args[]) {

        int length;
        Scanner input = new Scanner(System.in); //scanner to input any size array user wants

        System.out.println("Please enter the numbers for the array.");
        length = input.nextInt();

        String[] array = new String[length];

        for(int i = 0;i <length;i++) { //counter logic
                System.out.println("How many integers are in the array?"+(i+1));
                array[i] = input.nextLine();
        }
        System.out.println("Enter the numbers for the array (individually):");
        for(int i = 0;i <length;i++) { //counter logic
            System.out.print(array [i]);
            array[i] = input.nextLine();

        }

        input.close();

        minGap(array);

    }

    private static int minGap(int a[], int gapMin) {
        int []gap = new int[a.length];

        //a
        for (int i=0;i<a.length-2;i++) {
            if (gapMin>gap[i]) {
                    gapMin=gap[1];
            }


        }

        return gapMin;


    }

}

Answer 1

I believe you wanted a method to find the minimum gap. As such, you should not be passing that into the method. Your logic is also a bit off, you want to take the minimum value after gapMin>gap[i] (not a hardcoded gap[1] ). So you could do,

private static int minGap(int a[]) {
    int gapMin = Integer.MAX_VALUE;
    int[] gap = new int[a.length];
    for (int i = 0; i < a.length; i++) {
        if (gapMin > gap[i]) {
            gapMin = gap[i];
        }
    }
    return gapMin;
}

or (if you're using Java 8+)

private static int minGap(int a[]) {
    return Arrays.stream(a).min().getAsInt();
}

Then you need to actually save that value or print it. That is, change

minGap(array);

to (just print it)

System.out.println(minGap(array));

And you need an array of int (not a String[] ).

int[] array = new int[length];
for(int i = 0; i < length; i++) {
    System.out.printf("Please enter integer %d for the array%n", i + 1);
    array[i] = input.nextInt();
}