[Java] method with multiple instances (objects)

method_with_multiple_instances.java

// Java
// method with multiple instances (objects)

// works with NumberInput.java

class method_with_multiple_instances
{

 public static void main(String[] args)    // main method
 {
        NumberInput n1=new NumberInput();
        System.out.println("current value = " + n1.getNum());
        
        simpleMethod(n1);
        System.out.println("current value = " + n1.getNum());
}

    public static void simpleMethod(NumberInput calc1)
    {
        calc1.addNum(12);

    }
}

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NumberInput.java

// Java
// method with multiple instances (objects)

// works with method_with_multiple_instances.java

class NumberInput
{
    // instance (object) variable
    int result=0;
    
 public void addNum(int n1)     // method "addNum"
 {
 
        result = result + n1;
        
}

    public int getNum()
    {
        return result;
    }
}