Question

I’m doing lately so much C++ that I forgot how to use Java. I’m confused with the includes of C++ what Java doesn’t have. I’ve googled but always finds something like import but that doesn’t work and making an object but this isn’t possible because it’s a library.

I’ve got a class A : with something like this:

class Library
{
  int findMaximum(int [] table)
  {
    int max = 0;

    for( int i = 0; i < table.length; i++)
    {
      if( table[i] > max )
        max = table[i];
    }
    return max;
  }
}

and so much more functions.

And I’ve got a class B:

class Tdd_1{

  static boolean test1(){

  int [] table = new int[20];

  for(int i = 0; i < table.length; i++)
    table[i] = (int)(Math.random()*100)+1;

  findMax(table);

  return true;
  }
}

Now I can’t use findmax in that class? How can I fix this? The files are in the same dir?

Then eventually the purpose is to have one main file like:

  public static void main(String[] args)
  {

    System.out.println("Test 1: \n");
    if(test1())
      System.out.println("Passed.\n");
    else
      System.out.println("Failed.\n");
  }

where I can run test1 and all the others….

Can someone help me?

Kind regards;

What is a test case where I can

Answer 1

You need to instantiate The Library class first before you can invoke its methods.

Library lib = new Library();
.
.
.
lib.findMaximum(table);

Or declare findMaximum as static like so:

static int findMaximum(int [] table)

and access it like so:

Library.findMaximum(table)