class duotai {
int a;
int b;
public void fangfa1(int a, int b) {
this.a = a;
this.b = b;
System.out.println(a + b);
} public void fangfa2(int a, int b) {
this.a = a;
this.b = b;
System.out.println(a - b);
}
}class anotherduotai extends duotai {
public void fangfa1(int a, int b) {
super.a=a;
super.b=b;
System.out.println(a * b);
} public void fangfa3(int a, int b) {
super.a=a;
super.b=b;
if (b == 0)
System.out.println("b!=0");
else
System.out.println(a / b); }
}class test {
public static void main(String[] args) {
duotai dt = new duotai();
dt.fangfa1(8, 2);}}
int a;
int b;
public void fangfa1(int a, int b) {
this.a = a;
this.b = b;
System.out.println(a + b);
} public void fangfa2(int a, int b) {
this.a = a;
this.b = b;
System.out.println(a - b);
}
}class anotherduotai extends duotai {
public void fangfa1(int a, int b) {
super.a=a;
super.b=b;
System.out.println(a * b);
} public void fangfa3(int a, int b) {
super.a=a;
super.b=b;
if (b == 0)
System.out.println("b!=0");
else
System.out.println(a / b); }
}class test {
public static void main(String[] args) {
duotai dt = new duotai();
dt.fangfa1(8, 2);}}
class test {
public static void main(String[] args) {
duotai dt = new duotai();
dt.fangfa1(8, 2);}}改为
public class test {
public static void main(String[] args) {
duotai dt = new duotai();
dt.fangfa1(8, 2);}}