Natasha_Java Sesi 1

.gitignore

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+#Compiled class file
+*.class

ArrayBubbleSort.java

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+public class ArrayBubbleSort {
+	public static void main (String[] args) {
+		if (args.length < 1) {
+			System.err.println("Array of Number to be sorted");
+			return;
+		}
+
+		//https://en.wikipedia.org/wiki/Bubble_sort
+
+		// int[] arrayBubble -> Mendeklarasi variabel array
+		// arrayBubble = new int[10] -> Menginstansiasi object array
+		int[] arrayBubble = new int[args.length+1];
+		for (int i = 0; i < args.length; i++) {
+			arrayBubble[i] = Integer.parseInt(args[i]);
+		}
+
+		//boolean swapped = false;
+		int swapped;
+		do {
+			swapped = 0;
+			for (int i = 0; i < arrayBubble.length - 1; i++) {
+				if (arrayBubble[i] > arrayBubble[i+1] ) {
+					// sort tanpa temp -> pakai XOR
+					int temp = arrayBubble[i];
+					arrayBubble[i] = arrayBubble[i+1];
+					arrayBubble[i+1] = temp;
+					swapped ++;
+				}
+			}
+
+			// for (int i = 1; i < arrayBubble.length; i++) {
+			// System.out.print(arrayBubble[i] + " ");
+			//}
+			//System.out.println("");
+		} while (swapped != 0);
+
+		for (int i = 1; i < arrayBubble.length; i++) {
+			System.out.print(arrayBubble[i] + " ");
+		}
+	}
+}

ForFactorial.java

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+public class ForFactorial {
+	public static void main (String[] args){
+		if (args.length != 1) {
+			System.err.println("ForFactorial <number>");
+			return;
+		}
+
+
+		int number = Integer.parseInt(args[0]);
+		long ansFactorial = 1;
+		for (long i = 1; i <= number ; i++ ) {
+			ansFactorial *= i;
+		}
+		System.out.println("Factorial: " + ansFactorial);
+	}
+}

ForFactorialRecursive.java

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+public class ForFactorialRecursive {
+	public static void main (String[] args){
+		if (args.length != 1) {
+			System.err.println("ForFactorial <number>");
+			return;
+		}
+
+		int number = Integer.parseInt(args[0]);
+		ForFactorialRecursive hello = new ForFactorialRecursive();
+		int ans = hello.factorial(number);
+		System.out.println("Factorial Recursive: " + ans);
+	}
+
+	/*cara memanggil fungsi dalam main:
+	https://www.homeandlearn.co.uk/java/java_method_calling.html
+		1. function dibuat static
+		2. memanggil di main dengan "new HelloWorld().factorial"
+	*/
+
+	public int factorial (int n) {
+		if (n >= 1) {
+			return (n * factorial(n-1));
+		}
+		else {
+			return 1;
+		}
+	}
+}

HelloWorld.java

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+public class HelloWorld {
+	public static void main (String[] args){
+		System.out.println("Hello World!");
+	}
+}

IfNilai.java

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+public class IfNilai {
+	// ambil inputan melalui args
+
+	public static void main(String[] args){
+		int score;	
+
+		if (args.length != 1){
+			System.out.println("IfNilai <nilai>");
+		}
+		//else {
+			score = Integer.parseInt(args[0]);
+		//}
+
+
+
+
+		//if 0-20 E, 21-40 D, 41-60 C, 61-80 B, 81-100 A
+		if (score >=0 && score <=20) {
+			System.out.println("Nilai E");
+		}
+		else if (score >=21 && score <=40) {
+			System.out.println("Nilai D");
+		}
+		else if (score >=41 && score <=60) {
+			System.out.println("Nilai C");
+		}
+		else if (score >=61 && score <=80) {
+			System.out.println("Nilai B");
+		}
+		else if (score >=81 && score <=100) {
+			System.out.println("Nilai A");
+		}
+		else {
+			System.out.println("Nilai tidak tahu!");
+		}
+	}
+}

ListTestCollection.java

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+import java.util.*;
+
+public class ListTestCollection {
+	public static void main (String[] args) {
+		List<String> names = new ArrayList<>();
+		names.add("ABC");
+		names.add("Budi");
+		names.add("Andy");
+
+		for (String name : names) {
+			System.out.println(name);
+		}
+
+		Set<String> stringSet = new HashSet<>();
+		stringSet.add("String 1");
+		stringSet.add("String 1");
+		for (String string : stringSet) {
+			System.out.println(string);
+		}
+
+		Map<String, Integer> scoreByName = new HashMap<>();
+		scoreByName.put("Budi", 100);
+		scoreByName.put(null, 2);
+		scoreByName.put("Budi", 43);
+
+		for(Map.Entry<String, Integer> entry : scoreByName.entrySet()) {
+			System.out.println(entry.getKey() + ": " + entry.getValue());
+		}
+	}
+}

SwitchJumlahHari.java

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+public class SwitchJumlahHari {
+	public static void main (String[] args){
+		if (args.length != 2){
+			System.err.println("SwitchJumlahHari <bulan> <tahun> dalam angka");
+			return;
+		}
+
+		//jumlah hari dalam bulan (termasuk kabisat hanya kelipatan 4)
+		int bulan = Integer.parseInt(args[0]);
+		int tahun = Integer.parseInt(args[1]);
+		int jumlahHari;
+
+		// https://www.geeksforgeeks.org/switch-statement-in-java/
+
+		switch (bulan){
+			case 4:
+			case 6:
+			case 9:
+			case 11:
+				jumlahHari = 30;
+				break;
+			case 1:
+			case 3:
+			case 5:
+			case 7:
+			case 8:
+			case 10:
+			case 12:
+				jumlahHari = 31;
+				break;
+			case 2:
+			//https://en.wikipedia.org/wiki/Leap_year
+				// if (tahun % 4 == 0) jumlahHari = 29;
+				// else jumlahHari = 28;
+				if ((tahun % 4 == 0) && !(tahun % 100 == 0) && (tahun % 400 == 0)) {
+					jumlahHari = 29;	
+				}
+				else jumlahHari = 28;
+
+				break;
+			default :
+				jumlahHari = 0;
+		}		
+
+		System.out.println("Terdapat " + jumlahHari + " hari");
+	}
+}

SwitchKalender.java

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+public class SwitchKalender {
+	public static void main(String[] args){
+
+		if (args.length != 1) {
+			System.out.println("Masukkan bulan");
+		}
+
+		int bulan = Integer.parseInt(args[0]);
+		String namaBulan;
+		switch(bulan) {
+			case 1 :
+				namaBulan = "Januari";
+				break;
+			case 2 :
+				namaBulan = "Februari";
+				break;
+			case 3 :
+				namaBulan = "Maret";
+				break;
+			case 4 :
+				namaBulan = "April";
+				break;
+			case 5 :
+				namaBulan = "Mei";
+				break;
+			case 6 :
+				namaBulan = "Juni";
+				break;
+			case 7 :
+				namaBulan = "Juli";
+				break;
+			case 8 :
+				namaBulan = "Agustus";
+				break;
+			case 9 :
+				namaBulan = "September";
+				break;
+			case 10 :
+				namaBulan = "Oktober";
+				break;
+			case 11 :
+				namaBulan = "November";
+				break;
+			case 12 :
+				namaBulan = "Desember";
+				break;
+			default :
+				namaBulan = "Tidak ada";
+		}
+
+		System.out.println("Bulan: " + namaBulan);
+
+
+	}
+}