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Java Puzzlers презентация
Содержание
- 1. Java Puzzlers
- 2. Oddity The following method tests whether its
- 3. Making change public class Change {
- 4. Long Division public class LongDivision {
- 5. Addition public class Addition {
- 6. Tweedledum Declare variables x and i such
- 7. Tweedledee Declare variables x and i such
- 8. += public class PlusEquals {
- 9. Last Laugh public class LastLaugh {
- 10. Indecision public class Indecisive {
- 11. HelloGoodbye public class HelloGoodbye {
- 12. The reluctant constructor public class Reluctant {
- 13. Hello again public class Null {
- 14. The End
Слайд 2Oddity
The following method tests whether its argument is odd:
public static boolean
isOdd(int i) {
return i % 2 == 1;
}
Does it work?
It gives the correct answer for ¾ of the integers
Does it work?
It gives the correct answer for ¾ of the integers
Слайд 3Making change
public class Change {
public static void main(String[] args)
{
System.out.println(2.00 - 1.10);
}
}
0.8999999999999999
0.8999999999999999
Слайд 4Long Division
public class LongDivision {
public static void main(String[] args)
{
final long MICROS_PER_DAY = 24 * 60 * 60 * 1000 * 1000;
final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000;
System.out.println(MICROS_PER_DAY / MILLIS_PER_DAY);
}
}
5
5
Слайд 5Addition
public class Addition {
public static void main(String[] args) {
System.out.println(12345 + 5432l);
}
}
17777
17777
Слайд 6Tweedledum
Declare variables x and i such that
x +=
i;
is legal, but
x = x + i;
is not legal
short x = 0; int i = 123456;
short x = 0; int i = 123456;
Слайд 7Tweedledee
Declare variables x and i such that
x =
x + i;
is legal, but
x += i;
is not legal
Object x = "Hello "; String i = "world!";
Object x = "Hello "; String i = "world!";
Слайд 8+=
public class PlusEquals {
public static void main(String[] args) {
int i = 2;
i += 3.75;
System.out.println(i);
}
}
5
5
Слайд 9Last Laugh
public class LastLaugh {
public static void main(String[] args)
{
System.out.print("H" + "a");
System.out.print('H' + 'a');
}
}
Ha169
Ha169
Слайд 10Indecision
public class Indecisive {
public static void main(String[] args) {
System.out.println(decision());
}
static boolean decision() {
try {
return true;
}
finally {
return false;
}
}
}
false
false
Слайд 11HelloGoodbye
public class HelloGoodbye {
public static void main(String[] args) {
try {
System.out.println("Hello world!");
System.exit(0);
}
finally {
System.out.println("Goodbye world!");
}
}
}
Hello world!
Hello world!
Слайд 12The reluctant constructor
public class Reluctant {
private Reluctant internalInstance =
new Reluctant();
public Reluctant() throws Exception {
throw new Exception("I'm not coming out!");
}
public static void main(String[] args) {
try {
Reluctant b = new Reluctant();
System.out.println("Surprise!");
}
catch (Exception e) {
System.out.println("I told you so.");
}
}
}
Exception in thread "main" java.lang.StackOverflowError
Exception in thread "main" java.lang.StackOverflowError
Слайд 13Hello again
public class Null {
public static void main(String[] args)
{
((Null)null).greet();
}
public static void greet() {
System.out.println("Hello world!");
}
}
Hello world!
Hello world!
