java数组赋值-数字文字的使用
这是一个java类赋值。这一次我的分数很差，因为我的教授说我使用了数字文字。我在40分中输了28分。我设计的解决方案如此糟糕吗？他的确切评论是：java数组赋值-数字文字的使用,java,arrays,double,Java,Arrays,Double,这是一个java类赋值。这一次我的分数很差，因为我的教授说我使用了数字文字。我在40分中输了28分。我设计的解决方案如此糟糕吗？他的确切评论是： Create an application containing an array that stores 20 double values, such as 2.34, 7.89, 1.34, and so on. The application should: * Display the sum of all the arra
Create an application containing an array that stores 20 double values,
such as 2.34, 7.89, 1.34, and so on. The application should:
* Display the sum of all the array elements
* Display the average of all the array elements
* Display the largest value of all the array elements
"The program you submitted uses numeric literals in place of the array’s length.
This cause several runtime errors when I change the size of your array and tested the code."
import java.util.Random；
导入java.util.array；
公共类MyArray{
公共静态双[]双；
公共静态void main（字符串参数[]）{
MyArray.createDoublesArray（）；
MyArray.displayDoublesArray（）；
MyArray.displaySum（）；
MyArray.displayAverage（）；
MyArray.displayTheLargestValue（）；
}
/*填充双数组类成员*/
公共静态void createDoublesArray（）{
双打=新双打[20]；
//创建随机对象
随机r=新随机（）；
双量程最小值=1，量程最大值=9；
//生成随机双倍数-在2到9的范围内生成20次
对于（inti=0；i我猜是这样，而不是像下面这样
import java.util.Random;
import java.util.Arrays;
public class MyArray{
public static double[] doubles;
public static void main(String args[]) {
MyArray.createDoublesArray();
MyArray.displayDoublesArray();
MyArray.displaySum();
MyArray.displayAverage();
MyArray.displayTheLargestValue();
}
/*Fill up the double Array class member*/
public static void createDoublesArray(){
doubles = new double[20];
//Create Random object
Random r=new Random();
double rangeMin = 1, rangeMax = 9;
//Generate random double number - 20 times within the range of 2 to 9
for(int i=0;i<20;i++) {
//Generate random double numbers and round them to the two decimal places
double randomdouble = Math.round((rangeMin + (rangeMax - rangeMin) * r.nextDouble())*100.0)/100.0;
doubles[i] = randomdouble;
}
}
/*Display the double Array*/
public static void displayDoublesArray(){
String delimiter;
Arrays.sort(doubles);
System.out.println("The double array: ");
// iterate through all the array elements
System.out.print("{");
for(int i=0;i<20;i++) {
if(i < 19){
delimiter = ", ";
}
else{
delimiter = "}";
}
System.out.print(doubles[i]+ delimiter);
}
System.out.println("\n");
}
/*Displays the sum of the double array.*/
public static void displaySum() {
//initialize the sum with 0
double sum = 0.0;
// iterate through all the array elements
for (int i = 0; i < doubles.length; i++) {
// add up each element to the sum variable
sum += doubles[i];
}
// display the sum
System.out.println("The sum is: " + Math.round(sum*100.0)/100.0 + "\n");
}
/*Displays the average of the double array.*/
public static void displayAverage() {
// initialize the sum with 0
double sum = 0.0;
// iterate through all the array elements
for (int i = 0; i < doubles.length; i++) {
sum += doubles[i];
}
// display the average by dividing the sum to the length of the array
System.out.println("The average is: " + Math.round((sum / doubles.length)*100.0)/100.0 + "\n");
}
/*Displays the largest value from the double array */
public static void displayTheLargestValue() {
//initialize the largest value with the first element
double largestValue = doubles[0];
//iterate through the remaining elements (ignore the first)
for (int i = 1; i < doubles.length; i++) {
// check if "i" element is greater then the current largest value
if (doubles[i] > largestValue) {
largestValue = doubles[i];
}
}
// display the largest value
System.out.println("The largest value is: " + largestValue);
}
}
另外，这里
for(int i=0;i<doubles.length;i++)
您假设double
不是空的，当它为空时，将抛出一个异常
import java.util.Random;
import java.util.Arrays;
public class MyArray{
public static double[] doubles;
public static void main(String args[]) {
MyArray.createDoublesArray();
MyArray.displayDoublesArray();
MyArray.displaySum();
MyArray.displayAverage();
MyArray.displayTheLargestValue();
}
/*Fill up the double Array class member*/
public static void createDoublesArray(){
doubles = new double[20];
//Create Random object
Random r=new Random();
double rangeMin = 1, rangeMax = 9;
//Generate random double number - 20 times within the range of 2 to 9
for(int i=0;i<20;i++) {
//Generate random double numbers and round them to the two decimal places
double randomdouble = Math.round((rangeMin + (rangeMax - rangeMin) * r.nextDouble())*100.0)/100.0;
doubles[i] = randomdouble;
}
}
/*Display the double Array*/
public static void displayDoublesArray(){
String delimiter;
Arrays.sort(doubles);
System.out.println("The double array: ");
// iterate through all the array elements
System.out.print("{");
for(int i=0;i<20;i++) {
if(i < 19){
delimiter = ", ";
}
else{
delimiter = "}";
}
System.out.print(doubles[i]+ delimiter);
}
System.out.println("\n");
}
/*Displays the sum of the double array.*/
public static void displaySum() {
//initialize the sum with 0
double sum = 0.0;
// iterate through all the array elements
for (int i = 0; i < doubles.length; i++) {
// add up each element to the sum variable
sum += doubles[i];
}
// display the sum
System.out.println("The sum is: " + Math.round(sum*100.0)/100.0 + "\n");
}
/*Displays the average of the double array.*/
public static void displayAverage() {
// initialize the sum with 0
double sum = 0.0;
// iterate through all the array elements
for (int i = 0; i < doubles.length; i++) {
sum += doubles[i];
}
// display the average by dividing the sum to the length of the array
System.out.println("The average is: " + Math.round((sum / doubles.length)*100.0)/100.0 + "\n");
}
/*Displays the largest value from the double array */
public static void displayTheLargestValue() {
//initialize the largest value with the first element
double largestValue = doubles[0];
//iterate through the remaining elements (ignore the first)
for (int i = 1; i < doubles.length; i++) {
// check if "i" element is greater then the current largest value
if (doubles[i] > largestValue) {
largestValue = doubles[i];
}
}
// display the largest value
System.out.println("The largest value is: " + largestValue);
}
}
另外，这里
for(int i=0;i<doubles.length;i++)
您假设doubles
不是空的，当它为空时，将引发异常以允许我们轻松维护此代码，我首先创建：
//initialize the largest value with the first element
double largestValue = doubles[0];
createDoublesArray：
publicstaticvoid createDoublesArray（）{
双倍=新的双倍[尺寸]；
//创建随机对象
随机r=新随机（）；
双量程最小值=1，量程最大值=9；
//生成随机双倍数-在2到9的范围内生成20次
double randouble=0.0；//为了使我们能够轻松维护此代码，我首先创建：
//initialize the largest value with the first element
double largestValue = doubles[0];
createDoublesArray：
publicstaticvoid createDoublesArray（）{
双倍=新的双倍[尺寸]；
//创建随机对象
随机r=新随机（）；
双量程最小值=1，量程最大值=9；
//生成随机双倍数-在2到9的范围内生成20次
我同意马克西姆·舒斯丁的观点
只需添加一条评论
1） 例如，不要求总是使用double
/*Display the double Array*/
public static void displayDoublesArray(){
String delimiter;
Arrays.sort(doubles);
System.out.println("The double array: ");
// iterate through all the array elements
StringBuilder buff = new StringBuilder(); // use buffer
buff.append("{");
for(int i=0;i<SIZE;i++) {
if(i < SIZE-1){
delimiter = ", ";
}
else{
delimiter = "}";
}
buff.append(doubles[i]+ delimiter);
}
buff.append("\n");
System.out.println(buff.toString());
}
我同意马克西姆·舒斯丁的观点
只需添加一条评论
1） 例如，不要求总是使用double
/*Display the double Array*/
public static void displayDoublesArray(){
String delimiter;
Arrays.sort(doubles);
System.out.println("The double array: ");
// iterate through all the array elements
StringBuilder buff = new StringBuilder(); // use buffer
buff.append("{");
for(int i=0;i<SIZE;i++) {
if(i < SIZE-1){
delimiter = ", ";
}
else{
delimiter = "}";
}
buff.append(doubles[i]+ delimiter);
}
buff.append("\n");
System.out.println(buff.toString());
}
另外：if（i<19）{delimiter=“，”；}else{delimiter=“}”}如果数组没有正好20个元素，则
将使用错误的分隔符。这不是一个例外，但仍然是不正确的。@JonathannewUI这与op使用数字而不是数组的所有其他地方基本上是同一个问题。长度
我知道。这不是对您答案的批评，而是对op的一篇帖子指出他/她需要更改的位置。另外：if（i<19）{delimiter=“，”；}else{delimiter=“}”}如果数组没有正好20个元素，则
将使用错误的分隔符。这不是一个例外，但仍然是不正确的。@JonathannewUI这与op使用数字而不是数组的所有其他地方基本上是同一个问题。长度
我知道。这不是对您答案的批评，而是对op的一篇帖子指出他/她需要改变的地方。