我有这两种方法可以生成随机值的二维数组而没有任何问题。
import java.util.concurrent.ThreadLocalRandom;
public class Guitar {
private int strings;
private int chords;
private double[][] song;
public Guitar(int mstrings, int mchords) {
this.strings = mstrings;
this.chords = mchords;
song = new double[mstrings+1][mchords];
}
public void generateSong() {
for (int i = 0; i < chords; i++) {
for (int j = 0; j < song[i].length; j++) {
song[i][j] = ThreadLocalRandom.current().nextDouble(27.5, 4186);
song[strings][j] = ThreadLocalRandom.current().nextDouble(0, 3);
if(song[i][j] == song[strings][j])
System.out.printf(" %.1f", song[i][j]);
else System.out.printf(" %.2f", song[i][j]);
}
System.out.println();
}
}
//prints out the same table just with rows and columns swapped
public void simulateSong() {
System.out.println("\nGuitar.simualateSong() ");
for (int i = 0; i < chords; i++) {
for (int j = 0; j < strings; j++) {
System.out.printf(" %.2f", song[j][i]);
}
System.out.println();
}
}
}
这里是使用命令行参数来确定大小的主要部分。
public class Songwriter {
public static void main(String[] args) throws InterruptedException {
System.out.println("Guitar(): Generated new guitar with " + args[0] + " strings. Song length is " + args[1] + " chords.");
String args0 = args[0];
int strings = Integer.parseInt(args0);
String args1 = args[1];
int chords = Integer.parseInt(args1);
Guitar guitarObj1 = new Guitar(strings, chords);
guitarObj1.generateSong();
guitarObj1.simulateSong();
}
}
我唯一的问题是间距/对齐输出。这是一个样本运行，其中3和4作为行数和列数的参数
Guitar(): Generated new guitar with 3 strings. Song length is 4 chords.
1103.75 1133.24 3559.35 330.26
744.83 3850.74 3493.20 1848.97
3908.79 2548.87 1771.52 2761.32
0.5 0.7 2.0 1.6
Guitar.simualateSong()
1103.75 744.83 3908.79
1133.24 3850.74 2548.87
3559.35 3493.20 1771.52
330.26 1848.97 2761.32
我想格式化输出如此
Guitar(): Generated new guitar with 3 strings. Song length is 4 chords.
1103.75 1133.24 3559.35 330.26
744.83 3850.74 3493.20 1848.97
3908.79 2548.87 1771.52 2761.32
0.5 0.7 2.0 1.6
Guitar.simualateSong()
1103.75 744.83 3908.79
1133.24 3850.74 2548.87
3559.35 3493.20 1771.52
330.26 1848.97 2761.32
感谢任何帮助。感谢。