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("");
}
}