OCA JSE8 - String ejemplos

package com.codemonkey; import static java.lang.System.out; import java.lang.String;//No es necesaria la importación //String es inmutable public class TestString{ public static void main(String[] args){ stringDemo(); } public static void stringDemo(){ String cadena = new String("Adelaida");//[A,d,e,l,a,i,d,a] [0,1,2,3,4,5,6,7]; tam:8 char caracterA = cadena.charAt(0);//'A' int codigoEn = cadena.codePointAt(0);//65 int codigoAntes = cadena.codePointBefore(7);//100 int codigoAntesFinal = cadena.codePointCount(0, 7);//7 int comparadoX = cadena.compareTo("Adelaida");//0 int comparadoY = cadena.compareTo(new String("Adelaida"));//0 int comparadoZ = cadena.compareTo(new String("Adela"));//3 int comparadoC= cadena.compareToIgnoreCase("Adelaida");//0 String miCadena = cadena.concat(" " + new String("la gata mas fabulosa"));//Adelaida la gata mas fabulosa CharSequence charSequence = "fabulosa"; boolean tieneFabulosa= miCadena.contains(charSequence);//true boolean tieneLaGata = miCadena.contentEquals("la gata");//false boolean tieneAdelaida = miCadena.contentEquals(new StringBuffer("Adelaida"));//false char[] letras = {'A','B','C','D'}; String copiarValores = String.copyValueOf(letras);//ABCD; copia todo String copiarValoresDe = String.copyValueOf(letras,0,2);//AB; copia de 0 a 1, el 2 es el de no copia String docPDF = new String("documento.pdf"); boolean esPDF = docPDF.endsWith(".pdf");//true, documento.pdf termina en .pdf boolean esIgual = cadena.equals(new String("Adelaida"));//true boolean esCasiIgual = cadena.equalsIgnoreCase(new String("adelaida"));//true String formateada = String.format("%s = %d", "Fer", 35); byte[] misBytes = "ABC".getBytes();//[B@21a06946 int indiceX = cadena.indexOf(0); int indiceZ = cadena.indexOf(cadena.length()); int indiceY = cadena.indexOf(3); int indiceA = cadena.indexOf("A"); int indiceD = cadena.indexOf("d"); int indiceE = cadena.indexOf("e"); int tamanyo = cadena.length();//8 [Adelaida] String interno = cadena.intern(); boolean vacio = cadena.isEmpty(); String unir = String.join("-","Bienvenido","a","mi laberinto");//Bienvenido-a-mi laberinto int ultimoIndex = cadena.lastIndexOf("A");//0 int ultimoIndexDe = "Roma".lastIndexOf("o");//1 boolean hayComa= "Si, el la mato".matches(",");//false int codigos = cadena.offsetByCodePoints(0,7); String Str1 = new String("Mi laberinto de los naufragios"); String Str2 = new String("laberinto"); String Str3 = new String("Naufragios"); String strNombre = "Fernando".replace('o', 'a'); String strOracion = "El incipiente mago de la cueva encantada".replaceAll("a","e"); String strParrafo = "La naranja mecanica".replaceFirst("a","o");//Lo naranja mecanica String[] cadenas = "12,43,55,90".split(","); String strBiblio = new String("GENESIS - APOCALYPSIS"); String subCadena = "01234-789".substring(6,9);//789 char[] charStr = "abecedario".toCharArray(); String strMinuscula = "ANITA LAVO LATINA".toLowerCase(); String strMayuscula = "el murcielago de valladolid".toUpperCase(); String strNumero = "123".toString(); String strEspacio = " La genetica del gato ".trim(); String strValor = String.valueOf(new Double("34.0")); out.println("cadena) = "+cadena); out.println("charAt(0) = "+caracterA); out.println("codePointAt(0) = "+codigoEn); out.println("codePointBefore(7) = "+codigoAntes); out.println("codePointCount(0, 7) = "+codigoAntesFinal); out.println("compareTo(\"Adelaida\") = "+comparadoX); out.println("compareTo(\"new String(Adelaida)\") = "+comparadoY); out.println("compareTo(\"new String(Adela)\") = "+comparadoZ); out.println("compareToIgnoreCase(\"Adelaida\") = "+comparadoC); out.printf("%s\n",miCadena); out.println(tieneFabulosa? "Si, tiene \"fabulosa\"" : "No, no tiene \"fabulosa\"");//true out.println(tieneLaGata? "Si, tiene \"la gata\"" : "No, no tiene \"la gata\"");//false out.println(tieneAdelaida? "Si, tiene \"Adelaida\"" : "No, no tiene \"Adelaida\"");//false out.printf("%s\n",copiarValores);//ABCD out.printf("%s\n",copiarValoresDe);//AB out.println(esPDF? "Si, es pdf" : "No, no es pdf");//Si, es pdf out.println(esIgual? "Si, es igual" : "No, no es igual");//Si, es igual out.println(esCasiIgual? "Si, es casi igual" : "No, no es casi igual");//Si, es casi igual out.printf("%s\n",formateada);//Fer = 35 out.println(misBytes);//[B@21a06946 out.printf("%s.indexOf(0) = %d \n",cadena,indiceX);//-1 out.printf("%s.indexOf(8) = %d \n",cadena,indiceZ);//-1 out.printf("%s.indexOf(3) = %d \n",cadena,indiceY);//-1 out.printf("%s.indexOf(A) = %d \n",cadena,indiceA);//0 out.printf("%s.indexOf(d) = %d \n",cadena,indiceD);//1 out.printf("%s.indexOf(e) = %d \n",cadena,indiceE);//2 out.printf("%s.length()= %d \n",cadena,tamanyo);//8 out.printf("%s\n",interno);//Adelaida out.println(vacio? "Cadena vacia" : "Cadena llena");//Cadena llena out.printf("%s\n",unir);//Bienvenido-a-mi laberinto out.printf("%s\n",ultimoIndex);//0 out.printf("%s\n",ultimoIndexDe);//1 out.println(hayComa? "Si, hay coma" : "No, no hay coma");//No, no hay coma out.println("tam cadena = "+codigos);//7 out.println(" :"+Str1.regionMatches(11, Str2, 0, 9));//false out.println(" :" +Str1.regionMatches(11, Str3, 0, 9));//false out.println(strNombre);//Fernanda out.println(strOracion);//El incipiente mego de le cueve encentede out.println(strParrafo);//Lo naranja mecanica recorrerStr(cadenas);// 12 43 55 90 if("documento.xml".startsWith("doc")){ out.println("El archivo es un documento");//Inicia con doc } out.println(strBiblio.subSequence(0,4));//GENE out.println(strBiblio.subSequence(10,16));//APOCAL out.printf("%s\n",subCadena);//789 out.println(charStr);//abecedario out.printf("%s\n",strMinuscula); out.printf("%s\n",strMayuscula); out.printf("%s\n",strNumero); out.printf("%s\n",strEspacio); out.printf("%s\n",strValor); } public static void recorrerStr(String[] cads){ for(String cad : cads){ out.println(cad); } } }