Please help with passing an array to a new class

I have no knowledge of passing to and from a class to another class so if anyone can please help me.

I have to enter integers in a Java class with a GUI and then sort the integers in a different class in the same package. So far I have been able to sort it in the same class but need to only sort it in a different class and then pass the sorted array back to be displayed in the main class.
Please help
This is my working code so far:

int k;

int array1[]=new int[3];
array1[0] = Integer.parseInt(jTextField1.getText());
array1[1] = Integer.parseInt(jTextField2.getText());
array1[2] = Integer.parseInt(jTextField3.getText());

Arrays.sort(array1);

for (k=0;k<4;k++)
{
jTextArea1.append(Integer.toString(array1[k]));
jTextArea1.append(" \n");
}