2. Java Basics. Java Statements презентация

Содержание

Comments /* . . . */ - multi line comment // . . . - single-line comment /** . . . */ - comment for documentation. It

Слайд 12. Java Basics
2. Java Statements

Слайд 2Comments
/* . . . */ - multi line comment
// .

. . - single-line comment
/** . . . */ - comment for documentation. It can include some additional tags (e.g. @version, @author, @param, @return).

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Слайд 3How to Use Comments
Comments should be used to give overviews of

code and provide additional information that is not readily available in the code itself
Comments should contain only information that is relevant to reading and understanding the program
Doc comments describe Java classes, interfaces, constructors, methods, and fields
Java associates documentation comments with the first declaration after the comment

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Слайд 4Variables
Variables declaration: int k;

double x = 2.1;
Local variable should be initialized before it will be used.
Variable scope is a block where it was declared.
Sub block can’t contain duplicated variable declaration.

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Слайд 51. What will this program output?
public class InitTest {
public

static void main (String[] args) {
int a = 5;
int b;
if (a < 0) b = 10;
if (a >= 0) b = 50 ;
System.out.println(b);
}
}

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Слайд 62. What will this program output?
public class Oblzm {
public

static void main (String args[]){
int i = 5;
{
int j = 2;
System.out.println("Result is " + i * j);
}
}
}

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Слайд 73. What will this program output?
public class Oblzm {
public

static void main (String args[]){
int i = 5;
{
int j = 2;
}
System.out.println("Result is “ + i * j);
}
}

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Слайд 84. What will this program output?
public class Oblzm {
public

static void main (String args[]){
int i = 5;
{
int j = 2;
int i = 4;
System.out.println("Result is " + i * j);
}
}
}

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Слайд 9Constant Declaration
final modifier: final int a = 42;

// a = 12; - compile error

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Слайд 10If-Then_Else Statement I
if (boolean_expression) {
statements
}

if (boolean_expression) {
statements
} else {
statements
}
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Слайд 11If-Then_Else Statement II
if (boolean_expression) {
statements;
} else if (boolean_expression) {
statements;
} else if

(boolean_expression) {
statements;
}

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Слайд 12If-Then-Else Example
int a = 10;
if (a > 0) {
System.out.println("Positive");
}
else if (a

< 0) {
System.out.println("Negative");
}
else {
System.out.println("Zero");
}

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Слайд 13Switch Statement
switch(integral-expression) {
case integer-value1 :
statements;
case integer-value2

:
statements;
break;

case integer-value3 :
statements;
break;

default:
statements;
}

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Слайд 14Switch Example
char c = ’b’;
switch(c) {
case ’a’:
case ’e’:
case

’i’:
case ’o’:
case ’u’:
print("vowel");
break;

case ‘y’:
case ‘w’:
print("Sometimes a vowel");
break;
default:
print("consonant");
}

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Слайд 15Switch Statement Expressions
You can use enumerations as switch expression and case

values
You can use strings as switch expression and case values (since Java 7 only!)

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Слайд 16While and Do-While Statement
while (boolean_expression) {
statements;
}

do {
statements;
}

while (boolean_expression);

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Слайд 17While Example
double a = 100.;
while (a >= 1) {

System.out.println(a);
a /= 2.;
}

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Слайд 18Do-While Example
double a = 0.5;
do {
System.out.println(a);

a /= 2.;
} while (a >= 1);

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Слайд 19For Statement
for (initialization; Boolean-expression; step) {
statements;
}
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Слайд 20For Examples
for (int i = 10, k = 20; i

k; i++, k--) {
System.out.println(i + " " + k);
}

for (char i = 's'; i >= 'b'; i--) System.out.println(i);

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= 'b'; i--) System.out.println(i);*Infopulse Training Center">

Слайд 21Break and Continue Statements
break quits the loop without executing the rest

of the statements in the loop.
continue stops the execution of the current iteration and goes back to the beginning of the loop to begin the next iteration.
You can use a label before an iteration statement and in break / continue statements interrupt the loops up to where the label exists

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Слайд 22Use Break with a Label
L: for … {

for…{
break L;
}
}

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Слайд 23Exercise 2.2.1.
Find and print all divisors of a given natural number

n.

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Слайд 24Exercise 2.2.1.
See 221Divisors project for the full text.

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Слайд 25Exercise 2.2.2.
Find and print all prime divisors of a given natural

number n.

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Слайд 26Exercise 2.2.3.
Find sum of an infinite row for a given x


Compare

result with a Math.exp(x) method value

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Слайд 27Manuals
Learning the Java Language. Language Basics
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