用Java定义一个复数类complex，它的内部具有两个实例变量：realPart和imagPart，分别代表复数的实部和虚部

import java.util.Scanner;

public class Complex {
private int realPart;
private int imagPart;

public int getRealPart() {
return realPart;
}
public void setRealPart(int realPart) {
this.realPart = realPart;
}
public int getImagPart() {
return imagPart;
}
public void setImagPart(int imagPart) {
this.imagPart = imagPart;
}

public Complex plus(Complex c){
int real=this.realPart+c.realPart;
int imag=this.imagPart+c.imagPart;

Complex result=new Complex();
result.setRealPart(real);
result.setImagPart(imag);
return result;
}
public Complex minus(Complex c){
int real=this.realPart-c.realPart;
int imag=this.imagPart-c.imagPart;
Complex result=new Complex();
result.setRealPart(real);
result.setImagPart(imag);
return result;
}

public String format(){
if(this.imagPart<0){
return this.realPart+(this.imagPart+"i");
}else{
return this.realPart+"+"+this.imagPart+"i";
}
}
public static void main(String[] args) {
System.out.println("请输入第一个复数(格式：a+bi)：");
Scanner in=new Scanner(System.in);
String complex1=in.nextLine();
System.out.println("请输入第二个复数(格式：a+bi)：");
String complex2=in.nextLine();

Complex c1=new Complex();
Complex c2=new Complex();
String[] c1Arr=complex1.split("\\+");

int real1=Integer.parseInt(c1Arr[0]);
int imag1=Integer.parseInt(c1Arr[1].substring(0, 1));

c1.setRealPart(real1);
c1.setImagPart(imag1);

String[] c2Arr=complex2.split("\\+");
int real2=Integer.parseInt(c2Arr[0]);
int imag2=Integer.parseInt(c2Arr[1].substring(0, 1));

c2.setRealPart(real2);
c2.setImagPart(imag2);

System.out.println("第一个复数+第二个复数:"+c1.plus(c2).format());
System.out.println("第一个复数-第二个复数:"+c1.minus(c2).format());

}
}