Need help: input int from console and pass it into method in different class

I'm 开发者_Go百科a beginner. I want to read a number a from the console and then store them in variable to use as passing to a different class (different .java file).

How do I code the 2 classes?

public class PassedInMethod{ 

   private int a;

   public PAssMethod(int a) { 
      a = a; // TODO: where to get the a? 
      System.out.println("a was passed in!"+a);
   }
} 



public class Mainclass {

  public static void main( String args[] ) {
      Scanner input = new Scanner( System.in );

      int a;

      System.out.print( "Enter your nember: " );
      a = input.nextInt();

      PassedInMethod(int a);
   }
}

If you want to create an instance of the PassedInMethod class in which the member variable a contains the value passed to the constructor.

Try changing

PassedInMethod(int a);

to

PassedInMethod myObj = new PassedInMethod(a);

Also, if you want to update the instance variable to the value of the argument you need to do

this.a = a;

since the argument "hides" the instance varuable.

If you don't want to create an instance, and just invoke a method in a different class, you need to make the method static like this:

public static void PassMethod(int a) {
    // ....
}

You could then call the method like this

PassedInMethod.passMethod(a);

PassedInMethod however is not a very good name for a class, but I'm sure that was just for the sake of the example in the question.

You need to change

PassedInMethod(int a);

To

new PassedInMethod(a);

This looks to be more of what you want. You code had some syntax errors and such.

public class PassedInMethod {
    private int a;

    public PAssMethod(int a) { 
        this.a = a;
        System.out.println("a was passed in!"+a);
    }
}

public class Mainclass {
    public static void main( String args[] ) {
        Scanner input = new Scanner( System.in );
        int a;

        System.out.print( "Enter your nember: " );
        a = input.nextInt();

        PassedInMethod myobj = new PassedInMethod();
        myobj.PAssMethod(a);
    }
}