请问为什么会打印地址，这种情况该怎么操作?

Question

class Complex{
int a;
int b;
Complex(int a,int b){
this.a = a;
this.b = b;
}
Complex(){
this.a=0;
this.b=0;
}
Complex add(Complex c){
Complex r = new Complex();
r.a = this.a + c.a;
r.b = this.b + c.b;
return r;

}
Complex sub(Complex d){
    Complex t=new Complex();
    t.a=this.a-d.a;
    t.b=this.b-d.b;
    return d;
}

}
public class TestComplex {

public static void main(String[] args) {
// TODO Auto-generated method stub
Complex c1 = new Complex(40,30);
Complex c2 = new Complex(30,20);
System.out.println(c1.add(c2));

}

}

Answer 1

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代码修改如下:

class Complex{
int a;
int b;
Complex(int a,int b){
this.a = a;
this.b = b;
}
Complex(){
this.a=0;
this.b=0;
}
Complex add(Complex c){
Complex r = new Complex();
r.a = this.a + c.a;
r.b = this.b + c.b;
return r;
}
Complex sub(Complex d){
    Complex t=new Complex();
    t.a=this.a-d.a;
    t.b=this.b-d.b;
    return d;
}
@Override
public String toString(){
  return "a="+a+",b="+b;
}
}
public class TestComplex {
public static void main(String[] args) {
Complex c1 = new Complex(40,30);
Complex c2 = new Complex(30,20);
System.out.println(c1.add(c2));
}
}