Passing a function to another function as a parameter in Java

Question

I am very new to Java and trying to figure this problem out. Given the year, the month and day, I have to validate it first and do addition and subtraction to the date.

public class Date {



// fields

private int month;

private int day;

private int year;



// constructor

public Date(int month, int day, int year){

    this.month = month;

    this.day = day;

    this.year = year;

}


public void setMonth(int month){

    this.month = month;

}



public void setDay(int day){

    this.day = day;

}



public void setYear(int year){

    this.year = year;

}



public int getMonth(){

    return month;

}



public int getDay(){

    return day;

}



public int getYear(){

    return year;

}



public String displayDate(){

    return month + "/" + day + "/" + "/" + year;

}

}

http://stackoverflow.com/questions/4685563/how-to-pass-a-function-as-a-parameter-in-java — lurker, May 25 '13 at 18:03
There seems a lots of problem in your code .. please check the syntax — stinepike, May 25 '13 at 18:05
Instead of `if (x) return true; else return false;`, just do `return x`. It'll simplify things quite a bit. — arshajii, May 25 '13 at 19:20

Croo · Answer 1 · 2013-05-25T19:13:43.620

1

The answer I can give based on the code is what your error message says. In your function

public int add( int n){...}

you are trying to use the variable m which does not exist. You can pass this variable as another parameter where you call the add function.

public int add( int n, int m){...}
...
myDateObject.add(3,6);

The other possibility is to save the validated month's value into the private int month field first. Then use it in the add function instead of the nonexistent m variable.

Edit:

There are a lot of problem with this code. For example in order to run this program you would need a main method where your program can start executing. The constructor of your class tries to give value to fields that does not exsist(this.d = d; instead of this.day = d;). If this truly is the whole code I'd suggest to try to read / write and understand a java Hello World example first. :)

edited May 25 '13 at 19:13

answered May 25 '13 at 18:16

Croo

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I am very new to java. I included the whole program. – user1471980 May 25 '13 at 18:28
I modified the class Date. Can you help with how do I put this main? If I wanted to instantiate this class (Date), how would I do that? I am really stuggling with this. – user1471980 May 25 '13 at 20:37
Create another file named Program.java with this code: class Program { public static void main(string [] args) { Date date = new Date(5,25,2012); date.setYear(2013); System.out.println(date.displayDate()); } } – Croo May 25 '13 at 21:00

Passing a function to another function as a parameter in Java

1 Answers1