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Програмування мовою Java
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public class Vehicle {
public static void main (String [] args) {
Vehicle [] v = new Car [] {new Car () };
...
}
public void setVehicles (Vehicle c []) {
c [0] = new Vehicle ();
}
public void setVehicles2 (Vehicle c []) {
if (c [0] instanceof Car) {
c [0] = new Vehicle ();
}
}
public void setVehicles3 (Vehicle c []) {
if (c [0] instanceof Vehicle) {
c [0] = new Car ();
}
}
}
class Car extends Vehicle { }
(Java)
(Java)
(Java)
У програмі описаний клас:
class A { public int x = 0; public int y = 0; }
Що буде виведено на екран в результаті виконання наступного фрагмента програми?
A x; x = new A ();
System.out.print (x.y);
System.out.println (x.x);
class A {
...
}
class B extends A {
...
}
class C extends B {
...
}
public class MyClass {
public static void main (String args []) {
A x1 = new A ();
B x2 = new B ();
C x3 = new C ();
...
}
}
1 class Shape {
2 double square;
3 Shape (double r) {
4 square = 3.14 * r * r;
5 }
6 }
7 class Circle extends Shape {
8 double r;
9 Circle (double rad) {
10 r = rad;
11 super (rad);
12 }
13 }
Виконання програми завершилося помилкою. Які зміни необхідно включити в текст програми, щоб виключити помилку?
public class SomeClass {
public void perform () {
System.out.print ( "1");
}
public static void main (String [] args) {
SomeClass c = new SomeClass2 ();
c.perform ();
}
}
class SomeClass2 extends SomeClass {
public void perform () {
____
System.out.print ( "2");
}
}
(Java)
int a = 8, i = -1;
while (i <2) {
try {
System.out.print (36 / a);
}
catch (ArithmeticException e) {
System.out.print (36/2);
}
finally {
System.out.print ( "1");
}
a - = 3;
i ++;
}
public class SomeClass {
public static void main (String [] args) {
int a [] [] = { {1, 2 }, {3 } };
int b [] [] = (int [] []) a.clone ();
a [0] = new int [] {0 };
System.out.println (b [0] [0]);
}
}
(Java)
(Java)