STRING

                                                              STRING

Program Kelas String dalam Java

                                                                                                                 by.joel pantora

import java.lang.Character;

import java.lang.String;

import java.lang.StringBuffer;

class KelasString {

      public static void main(String args[]){

       

            //cara pengaksesan variable/objeck String

             String java1 = new String("JAVA IS FUNNY");

             String java2 = "Java is Easy";

             System.out.println("Isi variable java1 : "+java1.toLowerCase());

             System.out.println("Isi variable java2 : "+java2.toUpperCase());

             System.out.println("Isi variable java2 : "+java2.replace('A','#'));

             System.out.println("Karakter ketiga java2 : "+java2.charAt(2));

                                   

             System.out.println("\n*--------------------------------------*\n");

             

             //cara pengaksesan variable/objeck String

             StringBuffer data;

             data = new StringBuffer("Write One Run Anywhere");

             System.out.println("String asal : "+ data);

             data.replace(14,17,"Every"); //replace(awal,akhir,"pengganti")

             System.out.println("String menjadi : " + data);

             

             StringBuffer data1=new StringBuffer("I Like Java Coffee Very Much");

             System.out.println(data1);

             data1.delete(12,19);

             System.out.println("String menjadi : " + data1);

             

             System.out.println("\n*--------------------------------------*\n");

             

             //cara pengaksesan variable/objeck Char

             Character latihan = new Character('S');    

             System.out.println("Isi variable latihan : "+latihan.charValue());

      }

}

Program menghitung panjang String dalam Java

class PanjangString {

      public static void main(String arg[]) {

            String s1 = "Write Once Run Anywhere";

            String s2 = new String("I live in Java");

            int panjang;

           

            panjang = s1.length();

            System.out.println("Panjang String \""+ s1 +"\" = " + panjang);

            panjang = s2.length();

            System.out.println("Panjang String \""+ s2 +"\" = " +panjang);

      }

}

Program contoh penggunaan substring() dalam Java

class Substring {

      public static void main(String args[]) {

            String str = new String("Jang Nara");

            //Substring(awal,akhir);

            System.out.println("Jang Nara -> Substring(2) : " + str.substring(2));

            System.out.println("Jang Nara -> Substring(2,3) : "+str.substring(5,9));

           

            //Contoh lain pemakaian metode dalam objek String

            System.out.println("Sahabat(4) = "+ "Sahabat".substring(4));

            System.out.println("Sahabat(2,4) = "+ "Sahabat".substring(2,4));

      }

}

AwalAkhir.java

Program untuk memeriksa awal dan akhir suatu String

class AwalAkhir {

      public static void main(String arg[]) {

            String str = new String("Utada Hikaru");

            //apakah str diawali dengan....?

            System.out.println("String str = " + str);

            System.out.println("String diawali dengan 'Ut' ? "+

            str.startsWith("Ut"));

            System.out.println("String diawali dengan 'ut' ? "+

            str.startsWith("ut"));

            //apakah str diakhiri dengan...?

            System.out.println("String diakhiri dengan 'Ru' ? "+

            str.endsWith("Ru"));

            System.out.println("String diakhiri dengan 'ru' ? "+

            str.endsWith("ru"));

      }

}

 

Program untuk menghilangkan Whitespace di akhir dan awal string

class Trims {

      public static void main(String srgs[]) {

            String str  = "  Jang Nara ";

            String str2 = "Utada    Hikaru              ";

            System.out.println("String str = \""+ str +"\"");

            System.out.println("String trim(str) = \""+ str.trim() +"\"");

            System.out.println("\nString str2 = \""+ str2 + "\"");

            System.out.println("String trim(str2) = \""+ str2.trim() + "\"");

      }

}

Program penggunaan fungsi-fungsi Karakter dalam Java

import java.io.*;

class Karakter {

      public static void main(String ars[]) {

            BufferedReader tanya;

            char apa;

            try {

                  System.out.print("Masukkan sebuah karakter : ");

                  tanya = new BufferedReader(new InputStreamReader(System.in));

                  apa = (tanya.readLine()).charAt(0);

                 

                  //isDigit()

                  if(Character.isDigit(apa)) {

                        System.out.println("Karakter Digit");

                  }

                 

                  //isLetter()

                  if(Character.isLetter(apa)) {

                        System.out.println("Karakter Letter");

                  }

                 

                  //isWhitespace()

                  if(Character.isWhitespace(apa)) {

                        System.out.println("Karakter WhiteSpace");

                  }

                       

                  //isLowerCase()

                  if(Character.isLowerCase(apa)) {

                        System.out.println("Karakter Huruf Kecil");

                  }

                 

                  //isUpperCase()

                  if(Character.isUpperCase(apa)) {

                        System.out.println("Karakter Huruf Besar");

                  }

            } catch(IOException err) {

                  System.out.println("Error I/O");

                  System.exit(0);

            }

      }

}

Program menampilkan kode Ascii

class Ascii {

      public static void main(String args[]) {

            int i = 0;

            char c;

            for(i=0; i<256; i++) {

                  c = (char)i;            //konversi dari integer ke char

                  System.out.println(i +"\t"+ c);

            }

      }

}

String dan Number Format

import java.text.DecimalFormat;

public class FormatTest {

    public static void main(String[] args) {

        DecimalFormat myformat = new DecimalFormat("0.0000");

        for (int i=1; i<=10; i++) {

            System.out.println(myformat.format(1.0/i));

        }

    }

}