1.首先創建一個復數類，具有實部和虛部兩個成員變數，獲得資訊的方法，以及復數的模長，
public class ComplexNumber {
double real;
double image;
public ComplexNumber() { }
public ComplexNumber(double real,double image) {
// TODO Auto-generated constructor stub
this.real = real;
this.image = image;
}
String getinfo() {
String s;
s = real + "+" + image + "i";
return s;
}
public double length() {
return this.real*this.real + this.image*this.image;
}
}2.在測驗類中創建動態物件陣列，并實作按物件屬性（模長）排序，
public class Test {
public static void main(String[] args) {
int n;
Scanner in = new Scanner(System.in);
ArrayList<ComplexNumber> myList = new ArrayList<>();
System.out.println("test2-請輸入要輸入的復數個數：");
n = in.nextInt();
System.out.println("請輸入復數：");
System.out.println("(格式為實部 虛部)");
for(int i = 0; i < n; i++) {
myList.add(new ComplexNumber(in.nextDouble(), in.nextDouble()));
}
Collections.sort(myList,new Comparator<ComplexNumber>() {
@Override
public int compare(ComplexNumber one, ComplexNumber other) {
return Double.compare(one.length(), other.length());
}
});
System.out.println("after sort:");
for(int i = 0; i < myList.size(); i++)
System.out.println(myList.get(i).getinfo());
}
}Collections.sort(串列名,匿名物件Comparator);
new Comparator<要實作排序的類>() {
@Override
public int compare(類名 one, 類名 other) {
return Double.compare(one.屬性, other.屬性);
}
}當然，也可采用存入資料庫的方式，在資料庫里實作排序，這里不做詳細介紹，
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