I just started learning java and I'm working on a program. I'm getting an error here:
locationsOfCells = simpleDotCom.getLocationCells();
but I'm not sure what the error is. Eclipse say
Cannot make a static reference to the non-static method
getLocationCells()
from the typesimpleDotCom
Can someone help me with this? What am I doing wrong?
public class simpleDotCom {
int[] locationsCells;
void setLocationCells(int[] loc){
//Setting the array
locationsCells = new int[3];
locationsCells[0]= 3;
locationsCells[1]= 4;
locationsCells[2]= 5;
}
public int[] getLocationCells(){
return locationsCells;
}
}
public class simpleDotComGame {
public static void main(String[] args) {
printBoard();
}
private static void printBoard(){
simpleDotCom theBoard = new simpleDotCom();
int[] locationsOfCells;
locationsOfCells = new int[3];
locationsOfCells = theBoard.getLocationCells();
for(int i = 0; i<3; i++){
System.out.println(locationsOfCells[i]);
}
}
}
The problem is you are calling the getLocationCells()
method as if it was a static method when in fact it is an instance method.
You need to first create an object from your class like this:
simpleDotCom myObject = new simpleDotCom();
and then call the method on it:
locationsOfCells = myObject.getLocationCells();
Incidentally, there is a widely followed naming convention in the Java world, where class names always start with a capital letter - you should rename your class to SimpleDotCom
to avoid confusion.
You are attempting getLocationCells
in a static way. You need to create an instance of simpleDotCom
first:
simpleDotCom mySimpleDotCom = new simpleDotCom();
locationsOfCells = mySimpleDotCom.getLocationCells();
BTW class names always start with a capital letter. This would help remove the confusion of accessing the method as a member method.
Update:
To access from your updated static method, you would need to declare theBoard
as a static
variable also:
static simpleDotCom theBoard = new simpleDotCom();
you are trying to reference a non static method from the main method. That is not permitted in java. You can try making that simpleDotCom Class as static, so that u can have access to the methods of that class.
simpleDotCom obj = new simpleDotCom();
locationsOfCells = obj.getLocationCells();
And also your class name should start with a capital letter
You are trying to access a normal non static method from a static context, it does not work.
You can either remove the static word from the routine where you try to access the: getLocationCells()
from, or make getLocationCells()
static by adding the static word in its declaration.
也可以使simpleDotCom的字段和方法静态化,或者创建simpleDotCom的实例并访问该实例的方法。
Your code have some more errors.
The non static method couldn't call up with class name. So try to call the getLocationCells() with object.
simpleDotCom obj=new simpleDotCom(); obj.getLocationCells()
Next u will get the null pointer exception. U try to print the locationsOfCells values before it is initialized. So try call the setLocationCells() method before printing values.
Ur method definition void setLocationCells(int[] loc). Here u having the parameter loc but u didn't use any where in the method block. So please aware of handling method parameter.
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