JAVA pagrindai Lek. Liudas Drejeris
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1 JAVA pagrindai Lek. Liudas Drejeris
2 Programa (1) Programa, tai eilė instrukcijų (vadinamų programiniais sakiniais), kurie vykdomi paeiliui, kol gaunamas norimas rezultatas.
3 Programa (2)
4 Programa (2)
5 /* * Print the area and circumference of a circle, given its radius. */ public class CircleComputation { // Saved as "CircleComputation.java" Programa (3) public static void main(string[] args) { // Declare variables double radius, area, circumference; final double PI = ; // Assign a value to radius radius = 1.2; // Compute area and circumference area = radius * radius * PI; circumference = 2.0 * radius * PI; // Print results System.out.print("The radius is "); // Print description System.out.println(radius); // Print the value stored in the variable } }
6 Komentarai Sakiniai Blokai Kodo sintaksė
7 Komentarai (1) Vienos eilutės komentarai /*... */ //... Kelių eilučių komentaras /*... *... */
8 Komentarai (2) /* * Keliu eiluciu komentaras */ public class Hello { // Vienos eilutės komentaras public static void main(string[] args) { System.out.println("Hello, world!"); // Vienos eilutės komentaras } }
9 Kodo sakiniai (1) Sakinys dažniausiai prasideda iš naujos eilutės. Visada pasibaigia kabliataškiu ;. Pažymį vieną kode atliekamą veiksmą.
10 Kodo sakiniai (2) int number1 = 11; int number2 = 22; int number3 = 33; int sum; sum = number1 + number2 + number3; System.out.println(sum);
11 Kodo blokai (1) Kodo blokai prasideda atidaromuoju skliausteliu {. Baigiasi uždaromuoju skliausteliu }. Jie dažniausiai pažymi didesnę kodo dalį, kurios sakiniai susiję tarpusavyje. Kodo bloko pabaigoje (po uždaromojo skliaustelio) kabliataškis nededamas.
12 Kodo blokai (2) public static void main(string[] args) { } System.out.println("Hello, world!");
13 Kodo blokai (3) public class PrintTest { public static void main(string[] args) { System.out.println("Hello, world!"); } }
14 Pagrindiniai programavimo elementai Kintamieji Operacijos Ciklai Sąlygos Lyginamosios operacijos Kintamojo tipo keitimas
15 Kintamieji (1) Kintamasis turinti vardą atminties dalis, kurioje saugoma nurodyta informacija. Kintamasis turi tipą, vardą ir reikšmę. Tipas nurodo kaip saugoma, vardas kur saugoma, reikšmė kas saugoma.
16 Kintamieji (2)
17 Kintamieji (3) vartype varname; vartype varname1, varname2,...; vartype varname = initialvalue; vartype varname1 = initialvalue1, varname2 = initialvalue2,... ;
18 Kintamieji (4) int sum; int number1, number2; int height = 20; string name = vardas, surname= pavarde ;
19 Kintamieji (5) int sveikas skaičius. double skaičius su kableliu. char vienas simbolis. string teksto eilutė. boolean loginis kintamasis (true/false)
20 Operacijos (1) Operatorius Reikšmė Pavyzdys + Sudėtis x + y - Atimtis x - y * Daugyba x * y / Dalyba x / y % Dalybos liekana x % y ++ Padidinti per 1 x++ arba y++ -- Sumažinti per 1 x-- arba y--
21 Operacijos (2) int number1 = 98; int number2 = 5; int sum, difference, product, quotient, remainder; sum = number1 + number2; difference = number1 - number2; product = number1 * number2; quotient = number1 / number2; remainder = number1 % number2;
22 Ciklai (1)
23 while ciklas for ciklas foreach ciklas Ciklai (2)
24 Ciklai (3) paruošiamasis sakinys; while (salyga) { kartojamas kodo blokas; } kitas kodo sakinys;
25 Ciklai (4) int number = 0; int sum = 0; while (number <= 3) { sum = sum + number; number++; } System.out.println(sum);
26 Ciklai (5) for (paruošiamasis sakinys; sąlyga; pakeitimas) { kartojamas kodo blokas; } kitas kodo sakinys;
27 Ciklai (6) int sum = 0; for (int number = 0; number <= 3; number++) { sum = sum + number; } System.out.println(sum);
28 Sąlygos (1)
29 Sąlygos (2) if ( bandoma sąlyga ) { } kodo blokas;
30 Sąlygos (2) if ( a > b ) { } c = a - b;
31 Sąlygos (3)
32 Sąlygos (4) if ( bandoma sąlyga ) { kodo blokas; } else { kodo blokas; }
33 Sąlygos (4) if ( a > b ) { c = a - b; } else { c = b - a; }
34 Sąlygos (5) if ( a > b ) { c = a - b; } else if ( a == b ) { c = b + a; } else { c = b - a; }
35 switch(kintamasis) { case reiksme: kodo sakinys 1; break; case reiksme: kodo sakinys 2; break;. } Sąlygos (6)
36 Lyginamosios operacijos (1) Operatorius Reikšmė Pavyzdys == Lygu x == y!= Nelygu x!= y > Daugiau x > y >= Daugiau arba lygu x >= y < Mažiau x < y <= Mažiau arba lygu x <= y
37 Lyginamosios operacijos (2) Operatorius Reikšmė Pavyzdys && Ir (x > 1) && (x < 100) Arba (x < 1) (x > 100)! Ne!(x == 10)
38 Kintamojo tipo keitimas int number = 5; string text; text = (string) number;
39 Objektinis programavimas Metodai Klasės Objektai Klasių paveldimumas
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