Java声明复数类Complex

声明复数类Complex，成员变量包括实部和虚部，成员方法包括实现由字符串构造复数、复数加法、减法，字符串描述、比较相等、计算复数的模等操作。
百度百科—对复数的介绍

import java.util.Scanner;
public class Complex {  //z=a+bi;private double real;private double image;public Complex(double real,double image){this.real = real;this.image = image;}public Complex(String s){  //字符串构造复数1+2i/2/3i/a-i/a+is = s.trim();  //去除多余空格int op = -1;  //存储运算符的位置int i_index = -1;  //存储i的位置int len = s.length();String a = "";  //实部String b = "";  //虚部if (s!=null&&!"".equals(s)){for (int i=0;i<len;i++){if (s.charAt(i) == '+'||s.charAt(i) == '-')  op = i;  //记录实部虚部连接号if (s.charAt(i) == 'i')  i_index = i;  //记录虚部后面的i}if(i_index==-1){  //不含i，只有实部【不能加上op的判断，实部有可能为-】a = s;b = "0";}else if (op==-1&&i_index!=-1){if (i_index==0){  //ia = "0";b = "1";}else{  //2ia = "0";b = s.substring(0,i_index);}}else if (op==0&&i_index!=1){  //-iif (i_index==1){a = "0";b = "-1";}else{a = "0";b = s.substring(0,i_index);}}else if (i_index - op==1){  //虚部系数为1或-1a = s.substring(0,op);b = s.charAt(op) + "1";if ("".equals(a)) a = "0";}else if (i_index!=-1&&op!=-1){  //含i，不含op，实部为正且不含实部a = s.substring(0,op);b = s.substring(op,i_index);if ("".equals(a)) a = "0";if ("".equals(b)) b = "0";}//由于将实部与虚部分离的时候，将各自前面的正负号也一并加到了各自的字符串中，所以在使用Double.valueOf()将字符串转化为double类型的时候，Set(Double.valueOf(a),Double.valueOf(b));//已经考虑的正负号，故在此没有对正负做情况区分}}public void Set(double a,double b){this.real = a;this.image = b;}public String Add(Complex another){  //复数加法double add_x = this.real + another.real;double add_y = this.image + another.image;return new Complex(add_x,add_y).toString();}public String Sub(Complex another){  //复数减法double sub_x = this.real - another.real;double sub_y = this.image - another.image;return new Complex(sub_x,sub_y).toString();}public void Model(Complex another){  //复数的模double x = this.real - another.real;double y = this.image - another.image;System.out.println("复数的模长为："+String.format("%.2f",Math.sqrt(x*x+y*y)));}public String toString(){  //字符串描述if (this.getReal()==0&&this.getImage()==0){return "z = 0.0";}if (this.getReal() == 0){  //只有虚部return "z = "+this.getImage()+"i";}if (this.getImage() == 0){  //只有实部return "z = "+String.valueOf(this.getReal());}if (this.getImage() < 0){  //虚部为负return "z = "+this.getReal()+"+("+this.getImage()+"i)";}if (this.getImage() > 0){  //虚部为正return "z = "+this.getReal()+"+"+this.getImage()+"i";}return null;}public boolean equals(Complex another){  //比较相等return this==another||another!=null&&this.real==another.real&&this.image==another.image;}public double getReal() {return real;}public double getImage() {return image;}public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入第一个复数：");String s1 = sc.next();System.out.println("请输入第二个复数：");String s2 = sc.next();Complex z1 = new Complex(s1);Complex z2 = new Complex(s2);while(true){System.out.println("1.计算加法\t2.计算减法\t3.计算模长\t4.比较是否相等\t5.exit");int choice = sc.nextInt();switch (choice){case 1:System.out.println(z1.Add(z2));break;case 2:System.out.println(z1.Sub(z2));break;case 3:z1.Model(z2);break;case 4:{if (z1.equals(z2)) System.out.println("Yes");else System.out.println("No");break;}case 5:return ;}}}
}

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