Question

In: Computer Science

2.1) To the HighArray class in the highArray.java program, add a method called getMax() that returns...

2.1) To the HighArray class in the highArray.java program, add a method called getMax() that returns the value of the highest key in the array, or a -1 if the array is empty. Add some code in main() to exercise this method. You can assume all the keys are positive numbers.

2.2) Modify the method in Programming project 2.1 so that the item with the highest key is not only returned by the method but also removed from the array. Call the method removeMax().

// highArray.java

// demonstrates array class with high-level interface

// to run this program: C>java HighArrayApp

////////////////////////////////////////////////////////////////

class HighArray

{

private long[] a; // ref to array a

private int nElems; // number of data items

//-----------------------------------------------------------

public HighArray(int max) // constructor

{

a = new long[max]; // create the array

nElems = 0; // no items yet

}

//-----------------------------------------------------------

public boolean find(long searchKey)

{ // find specified value

int j;

for(j=0; j<nElems; j++) // for each element,

if(a[j] == searchKey) // found item?

break; // exit loop before end

if(j == nElems) // gone to end?

return false; // yes, can't find it

else

return true; // no, found it

} // end find()

//-----------------------------------------------------------

public void insert(long value) // put element into array

{

a[nElems] = value; // insert it

nElems++; // increment size

}

//-----------------------------------------------------------

public boolean delete(long value)

{

int j;

for(j=0; j<nElems; j++) // look for it

if( value == a[j] )

break;

if(j==nElems) // can't find it

return false;

else // found it

{

for(int k=j; k<nElems; k++) // move higher ones down

a[k] = a[k+1];

nElems--; // decrement size

return true;

}

} // end delete()

//-----------------------------------------------------------

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("");

}

//-----------------------------------------------------------

} // end class HighArray

////////////////////////////////////////////////////////////////

class HighArrayApp

{

public static void main(String[] args)

{

int maxSize = 100; // array size

HighArray arr; // reference to array

arr = new HighArray(maxSize); // create the array

arr.insert(77); // insert 10 items

arr.insert(99);

arr.insert(44);

arr.insert(55);

arr.insert(22);

arr.insert(88);

arr.insert(11);

arr.insert(00);

arr.insert(66);

arr.insert(33);

arr.display(); // display items

int searchKey = 35; // search for item

if( arr.find(searchKey) )

System.out.println("Found " + searchKey);

else

System.out.println("Can't find " + searchKey);

arr.delete(00); // delete 3 items

arr.delete(55);

arr.delete(99);

arr.display(); // display items again

} // end main()

} // end class HighArrayApp

Solutions

Expert Solution

// highArray.java
// demonstrates array class with high-level interface
// to run this program: C>java HighArrayApp
////////////////////////////////////////////////////////////////
class HighArray {
    private long[] a; // ref to array a
    private int nElems; // number of data items

    //-----------------------------------------------------------
    public HighArray(int max) // constructor
    {
        a = new long[max]; // create the array
        nElems = 0; // no items yet
    }

    //-----------------------------------------------------------
    public boolean find(long searchKey) { // find specified value
        int j;
        for (j = 0; j < nElems; j++) // for each element,
            if (a[j] == searchKey) // found item?
                break; // exit loop before end
        if (j == nElems) // gone to end?
            return false; // yes, can't find it
        else
            return true; // no, found it
    } // end find()

    //-----------------------------------------------------------
    public void insert(long value) // put element into array
    {
        a[nElems] = value; // insert it
        nElems++; // increment size
    }

    //-----------------------------------------------------------
    public boolean delete(long value) {
        int j;
        for (j = 0; j < nElems; j++) // look for it
            if (value == a[j])
                break;
        if (j == nElems) // can't find it
            return false;
        else // found it
        {
            for (int k = j; k < nElems; k++) // move higher ones down
                a[k] = a[k + 1];
            nElems--; // decrement size
            return true;
        }
    } // end delete()

    //-----------------------------------------------------------
    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 long getMax() {
        if (nElems == 0) {
            return -1;
        } else {
            long max = a[0];
            for (int i = 0; i < nElems; i++) {
                if (a[i] > max) {
                    max = a[i];
                }
            }
            return max;
        }
    }
//-----------------------------------------------------------
} // end class HighArray

////////////////////////////////////////////////////////////////
class HighArrayApp {
    public static void main(String[] args) {
        int maxSize = 100; // array size
        HighArray arr; // reference to array
        arr = new HighArray(maxSize); // create the array
        arr.insert(77); // insert 10 items
        arr.insert(99);
        arr.insert(44);
        arr.insert(55);
        arr.insert(22);
        arr.insert(88);
        arr.insert(11);
        arr.insert(00);
        arr.insert(66);
        arr.insert(33);
        arr.display(); // display items
        int searchKey = 35; // search for item
        if (arr.find(searchKey))
            System.out.println("Found " + searchKey);
        else
            System.out.println("Can't find " + searchKey);
        arr.delete(00); // delete 3 items
        arr.delete(55);
        arr.delete(99);
        arr.display(); // display items again

        System.out.println("Max in array is " + arr.getMax());
    } // end main()
} // end class HighArrayApp


// highArray.java
// demonstrates array class with high-level interface
// to run this program: C>java HighArrayApp
////////////////////////////////////////////////////////////////
class HighArray {
    private long[] a; // ref to array a
    private int nElems; // number of data items

    //-----------------------------------------------------------
    public HighArray(int max) // constructor
    {
        a = new long[max]; // create the array
        nElems = 0; // no items yet
    }

    //-----------------------------------------------------------
    public boolean find(long searchKey) { // find specified value
        int j;
        for (j = 0; j < nElems; j++) // for each element,
            if (a[j] == searchKey) // found item?
                break; // exit loop before end
        if (j == nElems) // gone to end?
            return false; // yes, can't find it
        else
            return true; // no, found it
    } // end find()

    //-----------------------------------------------------------
    public void insert(long value) // put element into array
    {
        a[nElems] = value; // insert it
        nElems++; // increment size
    }

    //-----------------------------------------------------------
    public boolean delete(long value) {
        int j;
        for (j = 0; j < nElems; j++) // look for it
            if (value == a[j])
                break;
        if (j == nElems) // can't find it
            return false;
        else // found it
        {
            for (int k = j; k < nElems; k++) // move higher ones down
                a[k] = a[k + 1];
            nElems--; // decrement size
            return true;
        }
    } // end delete()

    //-----------------------------------------------------------
    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 long getMax() {
        if (nElems == 0) {
            return -1;
        } else {
            long max = a[0];
            for (int i = 0; i < nElems; i++) {
                if (a[i] > max) {
                    max = a[i];
                }
            }
            return max;
        }
    }

    public long removeMax() {
        if (nElems == 0) {
            return -1;
        } else {
            int maxIndex = 0;
            for (int i = 0; i < nElems; i++) {
                if (a[i] > a[maxIndex]) {
                    maxIndex = i;
                }
            }
            long result = a[maxIndex];
            for (int i = maxIndex; i < nElems - 1; i++) {
                a[i] = a[i + 1];
            }
            nElems--;
            return result;
        }
    }
//-----------------------------------------------------------
} // end class HighArray

////////////////////////////////////////////////////////////////
class HighArrayApp {
    public static void main(String[] args) {
        int maxSize = 100; // array size
        HighArray arr; // reference to array
        arr = new HighArray(maxSize); // create the array
        arr.insert(77); // insert 10 items
        arr.insert(99);
        arr.insert(44);
        arr.insert(55);
        arr.insert(22);
        arr.insert(88);
        arr.insert(11);
        arr.insert(00);
        arr.insert(66);
        arr.insert(33);
        arr.display(); // display items
        int searchKey = 35; // search for item
        if (arr.find(searchKey))
            System.out.println("Found " + searchKey);
        else
            System.out.println("Can't find " + searchKey);
        arr.delete(00); // delete 3 items
        arr.delete(55);
        arr.delete(99);
        arr.display(); // display items again

        System.out.println("Max in array is " + arr.removeMax());
        System.out.println("Next Max in array is " + arr.removeMax());
    } // end main()
} // end class HighArrayApp

venereology answered 8 months ago
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