public static ArrayList<Chord> createRisingChordList(double duration, double[] frequencies, int count){
ArrayList<Chord> chordList = new ArrayList<Chord>();
double multiplier = 1.224;
for(int i = 0; i < count; i++){
Chord chord = new Chord(duration, frequencies);
chordList.add(chord);
frequencies[0] *= multiplier;
frequencies[1] *= multiplier;
frequencies[2] *= multiplier;
}
for(int x = 0; x < count; x++){
chordList.get(x).play();
}
return chordList;
}
///
double[] frequencies = {110.0, 110.0*1.224, 110.0*1.224*1.224};
ArrayList<Chord> risingChords = Final.createRisingChordList(0.2, frequencies, 10);
for (Chord risingChord: risingChords) {
StdOut.println("Playing: " + risingChord);
risingChord.play();
}
为什么我的输出是这样的：
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
Playing: [0.2: 830.2461363882288 1016.2212709391921 1243.8548356295712]
我可以确认它有正确的对象添加它只是因为某些原因替换它们。这是我添加每个对象后数组的输出。
The updated List after: 0 iterations
[0.2: 134.64 164.79935999999998 201.71441663999997]
The updated List after: 1 iterations
[0.2: 164.79935999999998 201.71441663999997 246.89844596735995]
[0.2: 164.79935999999998 201.71441663999997 246.89844596735995]
The updated List after: 2 iterations
[0.2: 201.71441663999997 246.89844596735995 302.2036978640486]
[0.2: 201.71441663999997 246.89844596735995 302.2036978640486]
[0.2: 201.71441663999997 246.89844596735995 302.2036978640486]
The updated List after: 3 iterations
[0.2: 246.89844596735995 302.2036978640486 369.8973261855955]
[0.2: 246.89844596735995 302.2036978640486 369.8973261855955]
[0.2: 246.89844596735995 302.2036978640486 369.8973261855955]
[0.2: 246.89844596735995 302.2036978640486 369.8973261855955]
Etc
etc
etc
根据我的理解，我的和弦课程中没有静态字段
和弦课程：
public class Chord {
double duration, frequencies[];
public Chord(double duration, double[] frequencies) {
this.duration = duration;
this.frequencies = frequencies;
}
public void play(){
playChord(duration, frequencies);
}
public String toString(){
String freq = "";
for(int i = 0; i < frequencies.length; i++){
freq = freq + " " + frequencies[i];
}
return "[" + duration + ": " + freq + "]";
}
private void playChord(double duration, double[] frequencies) {
final int sliceCount = (int) (StdAudio.SAMPLE_RATE * duration);
final double[] slices = new double[sliceCount+1];
for (int i = 0; i <= sliceCount; i++) {
double chord = 0.0;
for (double frequency: frequencies) {
chord += Math.sin(2 * Math.PI * i * frequency / StdAudio.SAMPLE_RATE);
}
slices[i] = chord/frequencies.length;
}
StdAudio.play(slices);
}
}