问题描述
我在这里有这段代码，最后几行应该通过JOptionPane窗口返回我的结果，
for(int i = 0; i < 10; i++) {
percent[i] = ((double)counts[i] / amount) * 100;
}
//create results
// results starting out is just the numbers. Remove the code from the for loop above that does that,// and instead use a for loop and go through both arrays creating the output string results with
// the count and percentage of each of the 10 numbers one per line.
results = String.format("%-10s%-10s%-10s\n*****************************************\n","Numbers:","Count:","Percentage:");
for(int i = 0; i < 10; i++) {
int number = i + 1;
results += String.format("%-10s%-10s%-10s\n",number,counts[i],percent[i]);
}
results = results + "\n\nRepeat this? Yes or No";
// show results in a confirm dialog that will also control the loop
choice = JOptionPane.showConfirmDialog(null,results,"Results",0);
}
，但依次重复初始窗口，请求输入随机数。我在寻找问题吗？
这是整个代码：
/* RandomCounts.java
*
* generates a certain amount of random numbers between 1 and 10
*
* Modify this code as follows:
*
* As is,this code just outputs the random numbers to a dialog Box.
*
* Create two arrays where indicated: counts (int) and percents (double). Each of size 10
*
* initialize counts where indicated
*
* update counts where indicated,and remove code that updates results
*
* calculate percentages using a for loop where indicated
*
* output both arrays where indicated
*
* Remember: arrays are zero based. Your arrays of size 10 will have indices 0-9,NOT 1-10
*/
import java.awt.Font;
import javax.swing.*;
public class RandomCountsstart {
public static void main(String[] args) {
UIManager.put("OptionPane.messageFont",new Font(Font.MONOSPACED,Font.BOLD,24));
int[] counts = new int[10];
double[] percent = new double[10];// Declare the arrays counts and percents here
int num = 0,amount = 0,choice=0;
String results;
while (choice == 0){
for(int i = 0; i < 10; i++){
counts[i] = 0;
}// initialize counts here using a for loop
String input = JOptionPane.showInputDialog(null,"Input the amount of random numbers to generate");
amount = Integer.parseInt(input);
results = "";
// generate the numbers in a for loop
for(int i = 1; i <= amount; i++){
num = (int)(Math.random()*10) + 1;
}
// here is where you should update the array counts based on which num was generated
// for example: if num is 3,update the array element that counts 3's
if(num == 1) {
counts[0]++;
}
else if(num == 2) {
counts[1]++;
}
else if(num == 3) {
counts[2]++;
}
else if(num == 4) {
counts[3]++;
}
else if(num == 5) {
counts[4]++;
}
else if(num == 6) {
counts[5]++;
}
else if(num == 7) {
counts[6]++;
}
else if(num == 8) {
counts[7]++;
}
else if(num == 9) {
counts[8]++;
}
else if(num == 10) {
counts[9]++;
}
}
// calculate percentages
// go through the count array and determine the percentage of each value. Store the
// percentage in the appropriate element in percents (parallel array example)
for(int i = 0; i < 10; i++) {
percent[i] = ((double)counts[i] / amount) * 100;
}
//create results
// results starting out is just the numbers. Remove the code from the for loop above that does that,0);
}
}
解决方法
所以我已经更新了您的代码，直到选择= JOptionPane.showConfirmDialog（null，results，“ Results”，0）;为止。在您的while循环中。
/* RandomCounts.java
*
* generates a certain amount of random numbers between 1 and 10
*
* Modify this code as follows:
*
* As is,this code just outputs the random numbers to a dialog box.
*
* Create two arrays where indicated: counts (int) and percents (double). Each of size 10
*
* initialize counts where indicated
*
* update counts where indicated,and remove code that updates results
*
* calculate percentages using a for loop where indicated
*
* output both arrays where indicated
*
* Remember: arrays are zero based. Your arrays of size 10 will have indices 0-9,NOT 1-10
*/
import java.awt.Font;
import javax.swing.*;
public class RandomCountsStart {
public static void main(String[] args) {
UIManager.put("OptionPane.messageFont",new Font(Font.MONOSPACED,Font.BOLD,24));
int[] counts = new int[10];
double[] percent = new double[10];// Declare the arrays counts and percents here
int num = 0;
int amount = 0;
int choice=0;
String results;
while (choice == 0){
for(int i = 0; i < 10; i++){
counts[i] = 0;
}// initialize counts here using a for loop
String input = JOptionPane.showInputDialog(null,"Input the amount of random numbers to generate");
amount = Integer.parseInt(input);
results = "";
// generate the numbers in a for loop
for(int i = 1; i <= amount; i++){
num = (int)(Math.random()*10) + 1;
}
// here is where you should update the array counts based on which num was generated
// for example: if num is 3,update the array element that counts 3's
if(num == 1) {
counts[0]++;
}
else if(num == 2) {
counts[1]++;
}
else if(num == 3) {
counts[2]++;
}
else if(num == 4) {
counts[3]++;
}
else if(num == 5) {
counts[4]++;
}
else if(num == 6) {
counts[5]++;
}
else if(num == 7) {
counts[6]++;
}
else if(num == 8) {
counts[7]++;
}
else if(num == 9) {
counts[8]++;
}
else if(num == 10) {
counts[9]++;
}
// calculate percentages
// go through the count array and determine the percentage of each value. Store the
// percentage in the appropriate element in percents (parallel array example)
for(int i = 0; i < 10; i++) {
percent[i] = ((double)counts[i] / amount) * 100;
}
//create results
// results starting out is just the numbers. Remove the code from the for loop above that does that,// and instead use a for loop and go through both arrays creating the output string results with
// the count and percentage of each of the 10 numbers one per line.
results = String.format("%-10s%-10s%-10s\n*****************************************\n","Numbers:","Count:","Percentage:");
for(int i = 0; i < 10; i++) {
int number = i + 1;
results += String.format("%-10s%-10s%-10s\n",number,counts[i],percent[i]);
}
results = results + "\n\nRepeat this? Yes or No";
// show results in a confirm dialog that will also control the loop
choice = JOptionPane.showConfirmDialog(null,results,"Results",0);
}
}
}