How do i add a new data type in this Bubble sort

Question

i have tried to i add a new String data type (String publisher) but my program has an error.
please show me
// libmainsys.java
// demonstrates bubble sort
// to run this program: C>java BubbleSortApp
class ArrayBub
private String[] a; // ref to array a
private int nElems; // number of data items
public ArrayBub(int max) // constructor
a = new String[max]; // create the array
nElems = 0; // no items yet
public void insert(String value) // put element into array
a[nElems] = value; // insert it
nElems++; // increment size
public void display() // displays array contents
for(int j=0; j<nElems; j++) // for each element,
System.out.print(a[j] + " "); // display it
System.out.println("");
public void bubbleSort()
int out, in;
for(out=nElems-1; out>1; out--) // outer loop (backward)
for(in=0; in<out; in++) // inner loop (forward)
if( a[in].compareTo(a[in+1])>0 ) // out of order?
swap(in, in+1); // swap them
} // end bubbleSort()
private void swap(int one, int two)
String temp = new String(a[one]);
a[one] = a[two];
a[two] = temp;
} // end class ArrayBub
class libmainsys
public static void main(String[] args)
int maxSize = 100; // array size
ArrayBub arr; // reference to array
arr = new ArrayBub(maxSize); // create the array
arr.insert("Manuel"); // insert 10 items
arr.insert("Portillo");
arr.insert("Kike");
arr.insert("Pedro");
arr.insert("Mono");
arr.insert("Cuca");
arr.insert("Zoila");
arr.insert("Karina");
arr.insert("Joto");
arr.display(); // display items
arr.bubbleSort(); // bubble sort them
arr.display(); // display them again
} // end main()
} // end class libmainsys
/////////////////////////////////////////////

Answer 1

nope i mean like this
// libmainsys.java
// demonstrates bubble sort
// to run this program: C>java BubbleSortApp
class ArrayBub
private String[] a; // ref to array a
private Sting[] publisher;
private int nElems; // number of data items
public ArrayBub(int max) // constructor
a = new String[max]; // create the array
nElems = 0; // no items yet
public void insert(String value) // put element into array
a[nElems] = value; // insert it
nElems++; // increment size
public void display() // displays array contents
for(int j=0; j<nElems; j++) // for each element,
System.out.print(a[j] + " "); // display it
System.out.println("");
public void bubbleSort()
int out, in;
for(out=nElems-1; out>1; out--) // outer loop (backward)
for(in=0; in<out; in++) // inner loop (forward)
if( a[in].compareTo(a[in+1])>0 ) // out of order?
swap(in, in+1); // swap them
} // end bubbleSort()
private void swap(int one, int two)
String temp = new String(a[one]);
a[one] = a[two];
a[two] = temp;
} // end class ArrayBub
class libmainsys
public static void main(String[] args)
int maxSize = 100; // array size
ArrayBub arr; // reference to array
arr = new ArrayBub(maxSize); // create the array
arr.insert("Manuel"); // insert 10 items
arr.insert("Portillo");
arr.insert("Kike");
arr.insert("Pedro");
arr.insert("Mono");
arr.insert("Cuca");
arr.insert("Zoila");
arr.insert("Karina");
arr.insert("Joto");
arr.display(); // display items
arr.bubbleSort(); // bubble sort them
arr.display(); // display them again
} // end main()
} // end class libmainsys
but i have no idea what to do next