System.out.println("Ruang yang telah diisi string: " + //PROGRAM class DemoAppend { sb.length()); public static void main(string[] args) {

Transkripsi

1 //PROGRAM class DemoAppend { StringBuffer sb = new StringBuffer("Pemrograman"); System.out.println("Ruang yang telah diisi string: " + sb.length()); char spasi = ' '; String bahasa = "Java"; int versi = 2; sb.append(spasi).append(bahasa).append(spasi). append(versi); //PROGRAM class DemoArgumenCommandLine { for (int i=0; i<args.length; i++) { System.out.println("Argumen ke-" + i + " : " +args[i]); //PROGRAM class DemoCariString { String s = "Tutorial Java: " + "Kursus Singkat Pemrograman Java"; System.out.println("s = \"" + s + "\""); System.out.println(); System.out.println("s.indexOf(\'J\') : " + s.indexof('j')); System.out.println("s.indexOf(\"Java\") : " + s.indexof("java")); System.out.println("s.lastIndexOf(\'J\') : " + s.lastindexof('j')); System.out.println("s.lastIndexOf(\"Java\") : " + s.lastindexof("java")); System.out.println(); System.out.println("s.indexOf(\'J\', 10) : " + //PROGRAM class DemoCapacityLength { StringBuffer sb = new StringBuffer("Java"); System.out.println("Kapasitas karakter: " + sb.capacity()); s.indexof('j', 10)); System.out.println("s.indexOf(\"Java\", 10) : " + s.indexof("java", 10)); System.out.println("s.lastIndexOf(\'J\', 15) : " + s.lastindexof('j', 15));

2 System.out.println("s.lastIndexOf(\"Java\", 15) : " + s.lastindexof("java", 15)); //PROGRAM 11-9 class DemoCharAt3 { public static String initcap(string s) { //PROGRAM 11-7 class DemoCharAt1 { String s = "Java"; System.out.println("Karakter pertama : " + s.charat(0)); System.out.println("Karakter kedua : " + s.charat(1)); System.out.println("Karakter ketiga : " + s.charat(2)); System.out.println("Karakter keempat : " + s.charat(3)); //PROGRAM 11-8 class DemoCharAt2 { System.out.println("Karakter pertama : " + "Java".charAt(0)); System.out.println("Karakter kedua : " + "Java".charAt(1)); System.out.println("Karakter ketiga : " + Java".charAt(2)); System.out.println("Karakter keempat : " + "Java".charAt(3)); boolean awalkata = true; char ch; String temp = s.tolowercase(); String hasil = ""; for (int i=0; i<temp.length(); i++) { ch = temp.charat(i); if (awalkata) { hasil += (char) (ch-32); else { hasil += ch; if (ch!= ' ') { // memeriksa karakter spasi awalkata = false; else { awalkata = true; return hasil; // Memanggil method initcap() System.out.println(initCap("contoh string pertama"));

3 System.out.println(initCap("CONTOH STRING KEDUA")); System.out.println(initCap("cONToh string KEtiGa")); //PROGRAM class DemoCompareTo { public static void bandingkan(string str1, String str2, boolean ignorecase) { int hasil; if (ignorecase) { hasil = str1.comparetoignorecase(str2); else { hasil = str1.compareto(str2); if (hasil < 0) { System.out.println("\"" + str1 + "\" lebih kecil dari \"" + str2 + "\""); else if (hasil == 0) { System.out.println("\"" + str1 + "\" sama dengan \"" + str2 + "\""); else /* if (hasil > 0) */ { System.out.println("\"" + str1 + "\" lebih besar dari \"" + str2 + "\""); System.out.println("Menggunakan compareto():"); bandingkan("mira", "mira", false); bandingkan("fira", "FIRA", false); bandingkan("kiki", "KIKI", false); System.out.println("\nMenggunakan comparetoignorecase():"); bandingkan("mira", "mira", true); bandingkan("fira", "FIRA", true); bandingkan("kiki", "KIKI", true); //PROGRAM class DemoDelete { StringBuffer sb = new StringBuffer("Pemrograman C dan Java"); System.out.println("Sebelum dihapus:"); System.out.println(sb.toString() + '\n'); sb.deletecharat(12); System.out.println("Setelah karakter ke-12 dihapus:"); System.out.println(sb.toString() + '\n'); //yang akan dihapus dari 12 sampai 16 (bukan 17) sb.delete(12, 17); System.out.println("Setelah karakter ke-12 " + "sampai 16 dihapus:");

4 System.out.println("Kapasitas setelah diset : " + sb2.capacity()); //PROGRAM class DemoEnsureCapacity1 { StringBuffer sb = new StringBuffer(); System.out.println("Kapasitas awal : " + sb.capacity()); // menentukan kapasitas baru sb.ensurecapacity(25); System.out.println("Kapasitas setelah diset : " + sb.capacity()); //PROGRAM class DemoEnsureCapacity2 { StringBuffer sb1 = new StringBuffer(); //PROGRAM class DemoEquals { String s1 = "Java"; String s2 = "JAVA"; String s3 = "Java"; String s4 = "C++"; System.out.println("s1 sama dengan s2 : " + s1.equals(s2)); System.out.println("s1 sama dengan s3 : " + s1.equals(s3)); System.out.println("s1 sama dengan s4 : " + s1.equals(s4)); StringBuffer sb2 = new StringBuffer(6); System.out.println("Pada objek sb1"); System.out.println("Kapasitas awal : " + sb1.capacity()); sb1.ensurecapacity(10); System.out.println("Kapasitas setelah diset : " + sb1.capacity()); System.out.println("\nPada objek sb2"); System.out.println("Kapasitas awal : " + sb2.capacity()); sb2.ensurecapacity(4); //PROGRAM class DemoEqualsIgnoreCase { String s1 = "Java"; String s2 = "JAVA"; String s3 = "Java"; String s4 = "C++"; System.out.println("s1 sama dengan s2 : " + s1.equalsignorecase(s2));

5 System.out.println("s1 sama dengan s3 : " + s1.equalsignorecase(s3)); System.out.println("s1 sama dengan s4 : " + s1.equalsignorecase(s4)); //PROGRAM class DemoGetBytes { String s = "Pemrograman Java"; byte[] temp = new byte[s.length()]; temp = s.getbytes(); // menampilkan isi temp for (int i=0; i<temp.length; i++) { System.out.print((char) temp[i]); System.out.println(arrKarakter); System.out.println("Karakter pertama : " + arrkarakter[0]); System.out.println("Karakter kedua : " + arrkarakter[1]); System.out.println("Karakter ketiga : " + arrkarakter[2]); System.out.println("Karakter keempat : " + arrkarakter[3]); //PROGRAM class DemoInsert { StringBuffer sb = new StringBuffer("saya menyukai Java"); char spasi = ' '; char koma = ','; String s1 = "Selain C/C++ dan Pascal"; String s2 = "juga "; sb.insert(0, s1); //PROGRAM class DemoGetChar { sb.insert(23, koma).insert(24, spasi); sb.insert(30, s2); String s = "Pemrograman Java"; int indeksawal = 12; int indeksakhir = 16; char[] arrkarakter = new char[indeksakhirindeksawal]; s.getchars(indeksawal, indeksakhir, arrkarakter, 0); //PROGRAM 11-1 class DemoMembuatString {

6 //PROGRAM char[] arr = {'a','b','c','d','e'; String s1 = "Contoh string literal"; String s2 = new String(); String s3 = new String(arr); String s4 = new String(arr, 1, 3); String s5 = new String(s1); System.out.println("s1: " + s1); System.out.println("s2: " + s2); System.out.println("s3: " + s3); System.out.println("s4: " + s4); System.out.println("s5: " + s5); class DemoPerbedaanEquals2 { String str1 = new String("Java"); // objek String pertama String str2 = str1; // mengacu ke objek String yang ditunjuk // oleh str1 boolean b1 = str1.equals(str2); boolean b2 = (str1 == str2); System.out.println("Menggunakan method equals() : " + b1); System.out.println("Menggunakan operator == : " + b2); //PROGRAM class DemoPerbedaanEquals1 { String str1 = new String("Java"); // objek String pertama String str2 = new String("Java"); // objek String kedua boolean b1 = str1.equals(str2); boolean b2 = (str1 == str2); System.out.println("Menggunakan method equals() : " + b1); System.out.println("Menggunakan operator == : " + b2); //PROGRAM class DemoRegionMatches { String s1 = "mira raharjo"; String s2 = "ASFIRA FAUZIYYAH"; boolean b1 = s1.regionmatches(1, s2, 3, 3); boolean b2 = s1.regionmatches(true, 1, s2, 3, 3); System.out.println("Menggunakan bentuk pertama : " + b1); System.out.println("Menggunakan bentuk kedua : " + b2);

7 //PROGRAM class DemoReplace { String s1 = "Pemrograman Java"; String s2 = s1.replace("pemrograman", "Program"); String s3 = "Java".replace('v', 'w'); System.out.println("s2 : " + s2); System.out.println("s3 : " + s3); //PROGRAM class DemoReverse { StringBuffer sb = new StringBuffer("Pemrograman Java"); System.out.println("Sebelum dibalik:"); System.out.println(sb.toString() + '\n'); sb.reverse(); //PROGRAM class DemoReplace1 { System.out.println("Setelah dibalik:"); StringBuffer sb = new StringBuffer("Java"); sb.replace(1, 2, "o"); sb.replace(2, 3, "w"); sb.replace(3, 4, "o"); //PROGRAM 11-2 class DemoSambungString1 { //PROGRAM class DemoReplace2 { StringBuffer sb = new StringBuffer("Java"); String teksbantuan = "Ini adalah contoh string panjang" + "yang digunakan untuk menampilkan informasi bantuan" + "di dalam program yang kita tulis"; System.out.println(teksBantuan); 3 // yang akan diganti adalah indeks ke-1 sampai sb.replace(1, 4, "owo"); //PROGRAM 11-3

8 class DemoSambungString2 { class DemoSetCharAt { public static void cetakisi(stringbuffer sb) { for (int i=0; i<sb.length(); i++) { final int TAHUN = 1995; final double PI = ; System.out.println("Karakter ke-" + i + " : " + sb.charat(i)); char ch = 'A'; boolean b = true; String s1 = "Java lahir pada tahun " + TAHUN; String s2 = "Nilai konstanta PI adalah " + PI; String s3 = "Karakter " + ch; String s4 = "Pernyataan (1 + 1 = 2) bernilai: " + b; System.out.println(s1); System.out.println(s2); System.out.println(s3); System.out.println(s4); //PROGRAM 11-4 class DemoSambungString3 { int a = 3; int b = 4; System.out.println("a + b = " + (a + b)); StringBuffer sb = new StringBuffer("Java"); System.out.println("Sebelum diset"); System.out.println("sb : " + sb); cetakisi(sb); sb.setcharat(1, 'o'); sb.setcharat(2, 'w'); sb.setcharat(3, 'o'); System.out.println("\nSetelah diset"); System.out.println("sb : " + sb); cetakisi(sb); //PROGRAM class DemoSetLength { StringBuffer sb = new StringBuffer("Pemrograman Java"); System.out.println("Sebelum diset"); System.out.println("sb : " + sb); //PROGRAM System.out.println("Lebar : " + sb.length());

9 sb.setlength(11); System.out.println("dan seterusnya..."); System.out.println("\nSetelah diset"); System.out.println("sb : " + sb); System.out.println("Lebar : " + sb.length()); //PROGRAM 11-5 class MyClass { private int x; //PROGRAM class DemoSubstring { String s1 = "Pemrograman Java"; String s2 = s1.substring(12); String s3 = s1.substring(5, 9); System.out.println("s2 : " + s2); System.out.println("s3 : " + s3); //PROGRAM class DemoToCharArray { String s = "Pemrograman Java"; char[] temp = new char[s.length()]; temp = s.tochararray(); System.out.println("Karakter pertama : " + temp[0]); System.out.println("Karakter kedua : " + temp[1]); System.out.println("Karakter ketiga : " + temp[2]); // constructor MyClass(int nilai) { x = nilai; // melakukan override terhadap method tostring() public String tostring() { return "Method tostring() pada kelas MyClass dipanggil"; public void showx() { System.out.println("Nilai x di dalam kelas MyClass: " + x); class DemoToString { MyClass obj = new MyClass(10); // Menyambung string dengan objek dari kelas MyClass String s = "Test : " + obj; System.out.println(s); obj.showx();

10 //PROGRAM 11-6 class DemoUpperLower { String s = "Pemrograman Java"; String hurufkapital = s.touppercase(); String hurufkecil = s.tolowercase(); System.out.println("String awal : " + s); System.out.println("String huruf besar : " + hurufkapital); System.out.println("String huruf kecil : " + hurufkecil);