我试图将getAverage和getHighest调用到我的驱动程序类中,并将它们打印在屏幕上。但是,我一直在获取垃圾值。知道这个程序有什么问题吗?谢谢

public class ArrayOperations
{
    public double getAverage(int[] array)
    {
        double total = 0;
        double average;

        for (int index = 0; index < array.length; index++)
            total += array[index];

        average = total / array.length;
        System.out.println("The average is: " + average);
        return average;
    }

    public int getHighest(int[] array)
    {
        String output = new String("");
        int highest = array[0];
        for(int i = 1; i < array.length; i++)
        {
            if (array[i] > highest)
                highest = array[i];
            System.out.println("The highest score=" + highest);
        }
        return highest;
    }
}

驱动类别:
public class ArrayOperationDriver
{
    public static void main(String[] args)
    {
        int [] testScores = {80, 90, 58, 75, 85, 45, 68, 72, 95};
        ArrayOperations object = new ArrayOperations();
        System.out.println(object);
    }
}

最佳答案

选项1:

您获得的“垃圾”值是object所在的内存位置。而是调用方法:

System.out.println(object.getAverage(testScores));
System.out.println(object.getHighest(testScores));

而且,我将对您的代码进行修改,这样它就不会打印很多“最高值为:”
public int getHighest(int[] array) {
    String output = new String("");
    int highest = array[0];
    for(int i = 1; i < array.length; i++) {
        if (array[i] > highest)
            highest = array[i];
            //Removed from here
            //System.out.println("The highest score=" + highest);
    }
    //Moved to here
    System.out.println("The highest score=" + highest);
    return highest;
}

选项2:

但是,由于您已经在方法内部进行打印,因此将它们更改为void并删除return语句。如下:
public class ArrayOperations {
    public void getAverage(int[] array) {
        double total = 0;
        double average;
        for (int index = 0; index < array.length; index++)
            total += array[index];

        average = total / array.length;
        System.out.println("The average is: " + average);
    }

    public void getHighest(int[] array) {
        String output = new String("");
        int highest = array[0];
        for(int i = 1; i < array.length; i++) {
            if (array[i] > highest)
                highest = array[i];
        }
        System.out.println("The highest score=" + highest);
    }
}

并以这种方式调用方法:
public class ArrayOperationDriver {
    public static void main(String[] args) {
        int [] testScores = {80, 90, 58, 75, 85, 45, 68, 72, 95};
        ArrayOperations object = new ArrayOperations();
        object.getAverage(testScores);
        object.getHighest(testScores);
    }
}

我想这是一种更清洁的方法。

选项3:

这样做的另一种选择是,从方法中返回数字,但从它们内部删除S.o.p调用。
public class ArrayOperations {
    public double getAverage(int[] array) {
        double total = 0;
        double average;
        for (int index = 0; index < array.length; index++)
            total += array[index];

        average = total / array.length;
        return average;
    }

    public int getHighest(int[] array) {
        String output = new String("");
        int highest = array[0];
        for(int i = 1; i < array.length; i++) {
            if (array[i] > highest)
                highest = array[i];
        }
        return highest;
    }
}

并将它们放入主要方法中:
public class ArrayOperationDriver {
    public static void main(String[] args) {
        int [] testScores = {80, 90, 58, 75, 85, 45, 68, 72, 95};
        ArrayOperations object = new ArrayOperations();
        System.out.println("Average number is: " + object.getAverage(testScores));
        System.out.println("Highest number is: " + object.getHighest(testScores));
    }
}

编辑

要打印testScores数组中的所有数字,您可以在一个简单的for循环或for-each循环中进行打印,我使用了for-each一个,但如果您想知道如何将其与for一起使用。
public class ArrayOperationDriver {
    public static void main(String[] args) {
        int [] testScores = {80, 90, 58, 75, 85, 45, 68, 72, 95};
        ArrayOperations object = new ArrayOperations();
        System.out.println("Average number is: " + object.getAverage(testScores));
        System.out.println("Highest number is: " + object.getHighest(testScores));

        System.out.print("The test scores are: ");
        for (int score : testScores)
            System.out.print(score + " ");
        System.out.println("");
    }
}

07-24 09:45
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