Thread: How to call int value from another class

Hey IDK12,

You can do it like this:

public class TestClass1 {
 
	/**
	 * JavaProgrammingForums.com
	 */
 
	public static void main(String[] args){
 
		TestClass2 tc2 = new TestClass2();
 
		int b = 0;
 
		if (b < tc2.numOfDay){
			System.out.println("b is less than " + tc2.numOfDay);
		}else{
			System.out.println("b is more or equal than " + tc2.numOfDay);
		}
		}
 
	}

public class TestClass2 {
 
	int numOfDay = 420;
 
}

Output:

b is less than 420

Thanks. Great example. I also have other questions. I amcreating a gpa calculator in a multithread( classes) and my friend told me not to do it that way until i learned all about the java concept. So I am bring them back to one single thread but i having problem. The average always gives me 0. Any ideas why ?

  import java.util.Scanner;
public class Gpa {
 
  double finalGpa;
 
  double firstGpa;
 
  double gpaAverage;
 
 
 public void setGrade(double grade){
 
  Gpa input = new Gpa();
 
  double gpaGradeOne;
 
  double gpaGradeTwo;
 
  double gpaGradeThree;
 
  double gpaGradeFour;
 
      if(( grade <= 100 && grade > 89)){
 
       input.calculatingGpa(4);   
 
    } else if ( grade <=89 && grade > 79){
 
       input.calculatingGpa(3);
 
    } else if(grade <= 79 && grade > 69){
 
      input.calculatingGpa(2);
 
    } else if( grade <= 69 && grade >= 0) {
 
      input.calculatingGpa(1);
 
    } else{
 
      System.out.println("Invalid");
 
    }
 }
 
  public void calculatingGpa(double singleGpa){
 
 
  firstGpa+= singleGpa;
 
  }
 
  public double get(){
 
    return finalGpa = firstGpa;
 
  }
 
    public static void main(String[] args){
 
      Gpa value = new Gpa();
 
      Gpa calling = new Gpa();
 
    Scanner get = new Scanner(System.in);
 
    int b = 0;
 
    double grade;
 
        System.out.println("How many class you have?");
 
      int numClass = get.nextInt();
 
      while ( b < numClass){
 
        System.out.println("What is the gade?");
 
         grade = get.nextInt();
 
          value.setGrade(grade);
 
          b++;
 
            }
 
       System.out.println("GPAaverage is:" + calling.get());
 
 
}
 }

Originally Posted by javapenguin

I think I might know. You need to call setGrade() somewhere.

Maybe like this:

private double grade;
public GPA(double grade)
{
this.grade = grade;
setGrade(grade);
}

wait, i am a little confused. about this method can you explain a little more. Why do i need this method? and i put your method in my code. it's still not correct.

We can not use neighbour's things directly. If we want to use then we should be relation or we have to ask neighbour. But you can not use if the thing is privacy for them .

Likewise in java world, in order to access another class members we have to be relation(means child class) or we have to use object.
There're many things to say about this, but her i am saying only few things. Let's see one simple example:

class first
{
public int a;
private int b;
protected int c;
//rest code
}
class second extens first //child of first
{
//rest code
public void access()
{
S.o.p(a);
}
class third
{
//rest code
void method1{
first f=new first();
f.a=2;
}
}

in the above code b can not accessed outside of the first class. C can be used by first class and their child class.