Apa Paket ing Jawa?
Jinis Paket ing Jawa
Paket bisa ditetepake dening pangguna (paket khusus) utawa diwenehake dening sistem sing disebut paket sing dibangun. Sawetara paket dibangun sing paling praktis lan akeh digunakake yaiku java.util, java.math, java.io, java.awt etc.Gambar 1: Java nyedhiyakake paket sing dibangun
Apa nggunakake paket?
Ngemas macem-macem kelas mbantu nggawe proyek sampeyan luwih apik, ngilangi konflik jeneng lan ngontrol tingkat akses file ing paket kasebut. Contone, yen sampeyan lagi ngembangake aplikasi tingkat perusahaan kanthi atusan kelas sing beda-beda, mula sampeyan butuh file sing cocog kanggo diselehake. Nemokake file sing bener sadurunge saben akses ora mung mbuwang wektu nanging bakal menehi kesaksian pendekatan naif sampeyan.Kepiye cara ngimpor paket?
Sampeyan kudu nggunakake tembung kunci " impor " kanggo ngimpor paket (s) gumantung saka kabutuhan sampeyan. Ayo goleki conto kanggo ndeleng cara kerjane.Impor java.util.*
package com.importpackage.core;
// * imports all classes available in "util"
import java.util.*;
public class ImportUtilPackage {
public static void main(String[] args) {
// List and ArrayList are two distinct classes provided by "java.util" package
List<String> weekDays = new ArrayList<String>(
Arrays.asList("Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"));
System.out.println("Days of the week are: " + weekDays.toString());
weekDays.remove("Monday");
System.out.println("Days of the week are: " + weekDays.toString());
// Date is another class implemented to process the Date by "java.util"
Date today = new Date();
System.out.println("Today's Date: " + today);
// Scanner is a class to take user inputs from console
// A built-in functionality provided by Java
Scanner scanner = new Scanner(System.in);
System.out.print("Enter your name: ");
String name = scanner.nextLine();
System.out.println("Your name: " + name);
System.out.print("Enter your age: ");
int age = scanner.nextInt();
System.out.println("Your age: " + age);
}
}
Elinga yen " java.util.* " ngimpor kabeh kelas sing kasedhiya ing paket " java.util ". Sampeyan uga bisa ngimpor kelas kaya ing ngisor iki.
import java.util.List;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;
Output
Dina minggu yaiku: [Senin, Selasa, Rebo, Kamis, Jum'at, Setu, Minggu] Dina minggu yaiku: [Selasa, Rebo, Kemis, Jum'at, Setu, Minggu] Tanggal Dina iki: Sel 27 Apr 22:48: 51 PKT 2021 Ketik jeneng sampeyan: Lizz (ketik pangguna) Jeneng sampeyan: Lizz Ketik umur sampeyan: 22 (ketik pangguna) Umur sampeyan: 22
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