java定义类complex，复数加减

class Fushu{
public static void main(String[] args){

Complex	complex1=new Complex(5,6);
Complex	complex2=new Complex(6,2);
System.out.println(complex1+"+("+complex2+")="+Complex.addition(complex1,complex2));
System.out.println(complex1+"-("+complex2+")="+Complex.subtract(complex1,complex2));
}
}

public class Complex{
protected	int a;
protected    int b;

public Complex(int a,int b){
this.a=a;
this.b=b;
}

public  String toString(){
return this.a+"+"+this.b+"i";
}

public static Complex addition(Complex complex1,Complex complex2){
int a=complex1.a+complex2.a;
int b=complex1.b+complex2.b;
return new Complex(a,b);
}

public static Complex subtract(Complex complex1,Complex complex2){
int a=complex1.a-complex2.a;
int b=complex1.b-complex2.b;
return new Complex(a,b);
}
}