One thing that I think need to be fixed is:

private Heap12(E[] e){
  this.heap = e;                     // Set heap array to passed in array
  this.size = 0;                     // Size HAS to be 0 initially
}

you need to copy it, otherwise caller has reference to your array to corrupt it.

One thing that I think need to be fixed is:

private Heap12(E[] e){
  this.heap = e;                     // Set heap array to passed in array
  this.size = 0;                     // Size HAS to be 0 initially
}

You need to copy it, otherwise the caller has reference to your array to corrupt it.

One thing that i think need to be fixed is

private Heap12(E[] e){
  this.heap = e;                     // Set heap array to passed in array
  this.size = 0;                     // Size HAS to be 0 initially
}

you need to copy it  , otherwise caller has reference to your array to currupt it  .

One thing that I think need to be fixed is:

private Heap12(E[] e){
  this.heap = e;                     // Set heap array to passed in array
  this.size = 0;                     // Size HAS to be 0 initially
}

you need to copy it, otherwise caller has reference to your array to corrupt it.