//DebugEleven3.java // Two boats should be equal // if they hold the same number
ID: 3661443 • Letter: #
Question
//DebugEleven3.java // Two boats should be equal // if they hold the same number of passengers // and have the same power source public class DebugEleven3 { public static void main(String args[]) { DebugRowboat redBoat = new DebugRowboat(); DebugRowboat blueBoat = new DebugRowboat(); System.out.print("The two boats are"); if(redBoat = blueBoat) System.out.println(" equal"); else System.out.println(" not equal); } }
//DebugEleven4.java // Creates and displays an array of boats - // some are rowboats; some are ocean liners import javax.swing.*; public class DebugEleven4 { static DebugBoat [] boatArray = new DebugBoat [5]; public static void main(String[] args) { buildArray(); displayArray(); } public static void buildArray() { char boatType; for(x=0; x < boatArray.length; x++) { boatType = getBoat(); if (boatType == 'r') boatArray[x] = DebugRowboat(); else boatArray[x] = DebugOceanLiner(); } } public static char getBoat() { string boatType; boatType = JOptionPane.showInputDialog(null, "Enter r for rowboat; o for ocean liner "); return boatType.charAt(0); } public static void displayArray() { for(x = 0; x < boatArray.length; x) JOptionPane.showMessageDialog(null, "Boat #" + (x + 1) + boatArray[x].toString()); } }
Explanation / Answer
//DebugBoat.java
//Teacher Notation
//CAREFUL ---- Must be compiled before DebugEleven1.java is compiled and run!!
abstract class DebugBoat
{
String boatType = new String();
int passengers;
String power = new String();
public DebugBoat(String bt)
{
boatType = bt;
}
public String toString()
{
return("This " + boatType +"boat carries " + passengers + " and is powered by " + power);
}
public abstract void setPower();
public abstract void setPassengers();
}
//DebugRowBoat.java
//Teacher Notation
//CAREFUL ---- Must be compiled before DebugEleven1.java is compiled and run!!
class DebugRowboat extends DebugBoat
{
public DebugRowboat()
{
super("row");
}
public void setPassengers()
{
passengers=2;
}
public void setPower()
{
super.power ="oars";
}
}
//DebugEleven1.java
// Instantiates Rowboat
// Rowboat is child of Boat
public class DebugEleven1
{
public static void main(String [ ] args)
{
DebugRowboat myBoat =new DebugRowboat();
System.out.println(myBoat.toString());
}
}
//DebugOceanLiner.java
//Teacher Notation
//CAREFUL ---- Must be compiled before DebugEleven2.java is compiled and run!!
public class DebugOceanLiner extends DebugBoat
{
public DebugOceanLiner()
{
super("ocean liner ");
setPassengers();
setPower();
}
public void setPassengers()
{
super.passengers=2400;
}
public void setPower()
{
super.power = "four engines" ;
}
}
//DebugEleven2.java
// An array for different boat types
public class DebugEleven2
{
public static void main(String[] args)
{
DebugBoat[] ref = new FixDebugBoat(3);
DebugRowboat blueBoat =new DebugRowboat();
DebugRowboat redBoat = new DebugRowboat();
DebugOceanLiner bigBoat = xDebugOceanLiner();
ref[0] = redboat;
ref[1] = greenBoat;
ref[2] = bigBoat;
for(int x = 0; x < ref.length; ++x)
{
ref[x].setPassengers();
ref[x].setPower();
}
}
}
//DebugEleven3.java
// Two boats should be equal
// if they hold the same number of passengers
// and have the same power source
public class DebugEleven3
{
public static void main(String args[])
{
DebugRowboat redBoat = new DebugRowboat();
DebugRowboat blueBoat = new DebugRowboat();
System.out.print("The two boats are");
if(redBoat == blueBoat)
System.out.println(" equal");
else
System.out.println(" not equal");
}
}
//DebugEleven4.java
// Creates and displays an array of boats -
// some are rowboats; some are ocean liners
public class DebugEleven4
{
static DebugBoat [] boatArray = new DebugBoat [5];
public static void main(String[] args)
{
buildArray();
displayArray();
}
public static void buildArray()
{
char boatType;
for(x=0; x < boatArray.length; x++)
{
boatType = getBoat();
if (boatType == 'r')
boatArray[x] = DebugRowboat();
else
boatArray[x] = DebugOceanLiner();
}
}
public static char getBoat()
{
string boatType;
boatType = JOptionPane.showInputDialog(null,
"Enter r for rowboat; o for ocean liner ");
return boatType.charAt(0);
}
public static void displayArray()
{
for(x = 0; x < boatArray.length; x++)
JOptionPane.showMessageDialog(null, "Boat #" + (x + 1) +
boatArray[x].toString());
}
}
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