Слайд 2
![Oddity The following method tests whether its argument is odd:](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-1.jpg)
Oddity
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
Слайд 3
![Making change public class Change { public static void main(String[]](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-2.jpg)
Making change
public class Change {
public static void main(String[] args) {
System.out.println(2.00 - 1.10);
}
}
0.8999999999999999
Слайд 4
![Long Division public class LongDivision { public static void main(String[]](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-3.jpg)
Long 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
Слайд 5
![Addition public class Addition { public static void main(String[] args)](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-4.jpg)
Addition
public class Addition {
public static void main(String[] args) {
System.out.println(12345
+ 5432l);
}
}
17777
Слайд 6
![Tweedledum Declare variables x and i such that x +=](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-5.jpg)
Tweedledum
Declare variables x and i such that
x += i;
is legal,
but
x = x + i;
is not legal
short x = 0;
int i = 123456;
Слайд 7
![Tweedledee Declare variables x and i such that x =](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-6.jpg)
Tweedledee
Declare variables x and i such that
x = x +
i;
is legal, but
x += i;
is not legal
Object x = "Hello ";
String i = "world!";
Слайд 8
![+= public class PlusEquals { public static void main(String[] args)](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-7.jpg)
+=
public class PlusEquals {
public static void main(String[] args) {
int
i = 2;
i += 3.75;
System.out.println(i);
}
}
5
Слайд 9
![Last Laugh public class LastLaugh { public static void main(String[]](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-8.jpg)
Last Laugh
public class LastLaugh {
public static void main(String[] args) {
System.out.print("H" + "a");
System.out.print('H' + 'a');
}
}
Ha169
Слайд 10
![Indecision public class Indecisive { public static void main(String[] args)](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-9.jpg)
Indecision
public class Indecisive {
public static void main(String[] args) {
System.out.println(decision());
}
static boolean decision() {
try {
return true;
}
finally {
return false;
}
}
}
false
Слайд 11
![HelloGoodbye public class HelloGoodbye { public static void main(String[] args)](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-10.jpg)
HelloGoodbye
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!
Слайд 12
![The reluctant constructor public class Reluctant { private Reluctant internalInstance](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-11.jpg)
The 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
Слайд 13
![Hello again public class Null { public static void main(String[]](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/284574/slide-12.jpg)
Hello again
public class Null {
public static void main(String[] args) {
((Null)null).greet();
}
public static void greet() {
System.out.println("Hello world!");
}
}
Hello world!