Consider the following class definition: public class AppleClass { private int x; private int y; public AppleClass(int a, int b) { x = a; y = b; } public int addNum( ) { return x + y; } public void changeNum( ) { x++; y--; } public String toString( ) { return “†+ x + “ †+ y; } } You have extended AppleClass to BanannaClass. BanannaClass has a third int instance variable, z. You want addNum to now add all three values and return the sum and changeNum to change x and y, but leave z alone. Which should you do?
Redefine addNum and changeNum without referencing super.addNum( ) or super.changeNum( ).
Redefine addNum to return the value of z + super.addNum( ), but leave changeNum alone.
Redefine changeNum to call super.changeNum( ) and then set z = x + y, but leave addNum alone.
Redefine addNum to return the value of z + super.addNum( ) and redefine changeNum to call super.changeNum( ) and then set z = x + y.
Redefine changeNum to call super.changeNum( ) without doing anything to z, and redefine addNum to return super.addNum( ).
Solution
public class BananaClass extends AppleClass {
private int z;
public BananaClass(int a){
z = a;
}
public int addNum( ) {
return z + super.addNum();
}
public String toString( ) {
return \"\" + x + \" \" + y + \" \" + z;
}
}
Redefine addNum to return the value of z + super.addNum( ), but leave changeNum alone.
.
Consider the following class definition- public class AppleClass { pri.docx
1. Consider the following class definition: public class AppleClass { private int x; private int y;
public AppleClass(int a, int b) { x = a; y = b; } public int addNum( ) { return x + y; } public void
changeNum( ) { x++; y--; } public String toString( ) { return “†+ x + “ †+ y; } }
You have extended AppleClass to BanannaClass. BanannaClass has a third int instance variable,
z. You want addNum to now add all three values and return the sum and changeNum to change x
and y, but leave z alone. Which should you do?
Redefine addNum and changeNum without referencing super.addNum( ) or super.changeNum( ).
Redefine addNum to return the value of z + super.addNum( ), but leave changeNum alone.
Redefine changeNum to call super.changeNum( ) and then set z = x + y, but leave addNum
alone.
Redefine addNum to return the value of z + super.addNum( ) and redefine changeNum to call
super.changeNum( ) and then set z = x + y.
Redefine changeNum to call super.changeNum( ) without doing anything to z, and redefine
addNum to return super.addNum( ).
Solution
public class BananaClass extends AppleClass {
private int z;
public BananaClass(int a){
z = a;
}
public int addNum( ) {
return z + super.addNum();
}
public String toString( ) {
return "" + x + " " + y + " " + z;
2. }
}
Redefine addNum to return the value of z + super.addNum( ), but leave changeNum alone.
