A basic calculator - Java. What am I doing wrong?

Calculator.java:32: error: '.class' expected

myCalculator.add(int aNum, int bNum);

^

Calculator.java:32: error: ';' expected

myCalculator.add(int aNum, int bNum);

^

Calculator.java:32: error: ';' expected

myCalculator.add(int aNum, int bNum);

^

Calculator.java:34: error: '.class' expected

myCalculator.subtract(int aNum, int bNum);

^

Calculator.java:34: error: ';' expected

myCalculator.subtract(int aNum, int bNum);

^

Calculator.java:34: error: ';' expected

myCalculator.subtract(int aNum, int bNum);

^

6 errors

```
class Calculator {
public Calculator(){
}
public void add(int aNum, int bNum){
return aNum + bNum;
}
public void subtract(int aNum, int bNum){
return aNum - bNum;
}
public void multiply(int aNum, int bNum){
return aNum * bNum;
}
public void divide(int aNum, int bNum){
if(bNum==0) {
system.out.println("Error! Dividing by zero is not allowed.");
return 0;
} else {
return aNum / bNum;
}
}
public void modulo(int aNum, int bNum){
if(bNum==0){
system.out.prinln("Error! Dividing by zero is not allowed.");
return 0;
} else {
return aNum % bNum;
}
}
public static void main(String[] args) {
Calculator myCalculator = new Calculator();
myCalculator.add(int aNum, int bNum);
System.out.println(myCalculator.add(5, 7));
myCalculator.subtract(int aNum, int bNum);
System.out.println(myCalculator.subtract(45, 11));
}
}
```