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Програмування мовою Java
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Розглянемо наступний приклад.
Exception
+ - LengthException
+ - TooLongException
+ - TooShortException
1 class BaseMeasurer {
2 int measureLength (Dimension d) throws TooLongException {.. }
3 }
4 class DerivedMeasurer extends BaseMeasurer {
5 ___ {
6 }
7 }
Яке з перерахованих нижче виразів можна використовувати в рядку 5 замість знаків підкреслення, щоб код успішно
відкомпільоване?
(Java)
1 package newpack;
2 class A {
3 int a, b;
4 void sum () {
5 System.out.print (a + b);
6}
7}
8 class B extends A {
9 ...
10}
11 ...
public abstract class SomeClass implements Runnable {
public static Object lock = new Object ();
public void lock () {
synchronized (lock) {
try {
lock.wait ();
System.out.print ( "1");
} Catch (InterruptedException e) { }
}
}
public void notifyThread () {
synchronized (lock) {
lock.notify ();
}
}
public void unlock () {
synchronized (lock) {
lock.notify ();
System.out.print ( "2");
}
}
public static void main (String s []) {
final SomeClass c = new SomeClass () {
public void run () {
lock ();
notifyThread ();
}
};
final SomeClass c1 = new SomeClass () {
public void run () {
unlock ();
}
};
new Thread (c) .start ();
new Thread (c1) .start ();
}
}
(Java)
1 ...
2 class A extends B {
3 int a, b;
4 void show () {
5 System.out.print (a);
6 System.out.print (b);
7}
8}
public class SomeClass {
public static void main (String s []) {
Calendar cal = new GregorianCalendar ();
cal.set (Calendar.YEAR, 2011);
cal.set (Calendar.MONTH, Calendar.APRIL);
cal.set (Calendar.DAY_OF_MONTH, 30);
cal.add (Calendar.DAY_OF_MONTH, 1);
cal.roll (Calendar.MONTH, 11);
SimpleDateFormat sdf = new SimpleDateFormat ( "yyyy MMMM dd");
System.out.println (sdf.format (cal.getTime ()));
}
}
(Java)
1 package newpack;
2 class A {
3 int a, b;
4 void sum () {
5 System.out.print (a + b);
6}
7}
8 class B extends A {
9 ...
10}
11 ...
int i = 0;
while (i <5) {
if (i == 0)
throw new NullPointerException ( "first");
if (i == 2)
throw new NumberFormatException ( "second");
i ++;
}
(Java)
1 class A {
2 final int a;
3 protected double c;
4 int q;
5 private int j;
6}
7 class B extends A {
8 int c;
9 B (int b1, int b2) {
10 super ();
11 c = b1;
12}
(Java)