英文:
How do I generate more values in each column?
问题
以下是您的代码部分的中文翻译：
我需要帮助看看我做错了什么。
我试图生成3列中的10个随机值，但到目前为止我只能生成一个。
private static void displayDifficultyScore(ArrayList<TestDive> alist, double[] dArray)
{
// 创建一个Random类
Random rand = new Random();
double[] diffScores = new double[10];
double[] diffArray = new double[3];
// 打印下一行
System.out.println();
// 循环难度分数
for (int j = 0; j < diffScores.length; j++) {
diffScores[j] = 2.0 + rand.nextDouble() * 3.0;
System.out.printf("%-7.1f%n", diffScores[j]);
}
}
public static void main(String[] args)
{
double[] diffScores = new double[1];
ArrayList<TestDive> alist = new ArrayList<TestDive>();
for (int j = 0; j < diffScores.length; j++) {
displayDifficultyScore(alist, diffScores);
}
}
}
当前它只以1列打印出来：
2.9
4.4
4.9
3.7
4.3
3.1
4.2
4.5
4.2
2.9
我想要实现的输出是：
2.9 3.0 2.2
4.4 3.4 4.7
4.9 2.5 3.0
3.7 4.7 3.3
4.3 4.4 3.8
3.1 3.0 4.9
4.2 2.1 2.9
4.5 5.0 2.2
4.2 4.8 3.6
2.9 2.6 3.1
请注意，上述中文翻译部分仅包括代码部分，不包括问题和答案。
英文:
I need help to see what I'm doing wrong.
I'm trying to generate 10 random values in 3 columns, but so far I can only generate one.
private static void displayDifficultyScore(ArrayList<TestDive> alist, double[] dArray)
{
// Create a Random class
Random rand = new Random();
double[] diffScores = new double[10];
double[] diffArray = new double[3];
// Print next line
System.out.println();
// Loop for Difficulty Scores
for (int j = 0; j < diffScores.length; j++) {
diffScores[j] = 2.0 + rand.nextDouble() * 3.0;
System.out.printf("%-7.1f%n", diffScores[j]);
}
}
public static void main(String[] args)
{
double[] diffScores = new double[1];
ArrayList<TestDive> alist = new ArrayList<TestDive>();
for (int j = 0; j < diffScores.length; j++) {
displayDifficultyScore(alist, diffScores);
}
}
}
Currently it's only printing out in 1 column:
2.9
4.4
4.9
3.7
4.3
3.1
4.2
4.5
4.2
2.9
Output that I want to achieve:
2.9 3.0 2.2
4.4 3.4 4.7
4.9 2.5 3.0
3.7 4.7 3.3
4.3 4.4 3.8
3.1 3.0 4.9
4.2 2.1 2.9
4.5 5.0 2.2
4.2 4.8 3.6
2.9 2.6 3.1
答案1
得分: 1
public class Hello {
private static double[][] generateDifficultyScores(int matrixLength, int matrixWidth) {
// 创建一个Random类
Random rand = new Random();
double[][] diffScores = new double[matrixLength][matrixWidth];
// 循环生成难度分数
for (int i = 0; i < matrixLength; i++) {
for (int j = 0; j < matrixWidth; j++) {
diffScores[i][j] = 2.0 + rand.nextDouble() * 3.0;
}
}
return diffScores;
}
public static void main(String[] args) {
// 生成随机的难度分数（将其存储在一个值的2D数组或矩阵中）
double[][] diffScores = generateDifficultyScores(10, 3);
// 逐行打印矩阵中的每个数组
for (int j = 0; j < diffScores.length; j++) {
// 打印数组的每个元素，用制表符`\t`分隔，并格式化为一位小数
System.out.printf("%7.1f\t%7.1f\t%7.1f", diffScores[j][0], diffScores[j][1], diffScores[j][2]);
// 为下一次迭代添加换行符
System.out.println();
}
}
}
英文:
You can try generating a 2D array (or matrix) first and then printing it
Something like this
public class Hello {
private static double[][] generateDifficultyScores(int matrixLength, int matrixWidth) {
// Create a Random class
Random rand = new Random();
double[][] diffScores = new double[matrixLength][matrixWidth];
// Loop for Difficulty Scores
for (int i = 0; i < matrixLength; i++) {
for (int j = 0; j < matrixWidth; j++) {
diffScores[i][j] = 2.0 + rand.nextDouble() * 3.0;
}
}
return diffScores;
}
public static void main(String[] args) {
// generate random difficulty scores (stores it in a 2D array or matrix of values)
double[][] diffScores = generateDifficultyScores(10, 3);
// print out each array in matrix (line by line)
for (int j = 0; j < diffScores.length; j++) {
// print each element of the array separated by a tab `\t` and formatted to one decimal point
System.out.printf("%7.1f\t%7.1f\t%7.1f", diffScores[j][0], diffScores[j][1], diffScores[j][2]);
// add a newline for next iteration
System.out.println();
}
}
}
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