Write a program to perform all String class and StringBuffer class operation.

 

AIM: Write a program to perform all String class and StringBuffer class operation.

CODE: (String)

public class string{ 

public static void main(String args[]){

            //string constructor

            char []s1={'K','H','U','S','H','I'};

            String s2=new String(s1);

            System.out.println("\n"+s2+" - String constructor\n");

 

            //string constructor with index number and number of chars

            String s3=new String(s1,2,4);

            System.out.println(s3+" - string constructor with index number and number of chars \n");

 

            //string constructor in string

            String s4=new String(s1);

            System.out.println(s4+" - String constructor with string\n");

 

            //String constructor in byte

            byte []s5={97,75,78};

            String s6=new String(s5);

            System.out.println(s6+" - String constructor with byte array\n");

 

            //String length

            System.out.println(s6.length()+" - String length\n");

 

            //String litral

            System.out.println("KHUSHI PITRODA".length()+" - Length of string with String litral\n");

 

            //String conversion with valueOf

            int a=98;

            String s7 = String.valueOf(a);

            System.out.println(s7+" - String conversion with valueOf\n");

 

            //To extract single character from String

            System.out.println(s2.charAt(3)+" - To extract single character from String\n");

 

            //Char into bytes

            byte s8[]="khushi".getBytes();

            for(int i=0;i<s8.length;i++)

            {

                        System.out.print(s8[i]+"\t");

            }

            System.out.println("- Char into bytes getbytes\n");

 

            //char array

            char s9[]="Pitroda".toCharArray();

            System.out.println(s9[0]+" - String to character array\n");

 

            //String Comparision

            System.out.println(s2.equals(s3)+" - String comparision\n");

            System.out.println(s2.equalsIgnoreCase("KhuShi")+" - String comparision ignore case\n");

 

            System.out.println("Khushi Pitroda".regionMatches(0,"Khushi",0,6)+" - Region Mateches\n");

            boolean b = "Khushi".startsWith("Khu");

            System.out.println(b+" - Starts with and Ends with\n");

 

            //compare to

            Integer i="happy".compareTo("Happy");

            if(i<0)

            {

                        System.out.println("happy is less than Happy - comparesTo\n");

            }

            else if(i>0)

            {

                        System.out.println("happy is grater than Happy - comparesTo\n");

            }

            else

            {

                        System.out.println("happy is equals to Happy - comparesTo\n");

            }

 

            //searching string

            int j = "JJava".lastIndexOf('a');

            System.out.println(j+" - lastIndexOf index of a in JJava\n");

            int k = "JJava".indexOf('a');

            System.out.println(k+" - indexOf index of a in JJava\n");

 

            //modifying String

            String s10 = "Pitroda Khushi".substring(8);

            System.out.println(s10+" - substring\n");

            String s11 = s10+" pitroda";

            System.out.println(s11+" - concate\n");

            String s12 = s11.replace('p','P');

            System.out.println(s12+" - replace\n");

            String s13 = s12.trim();

            System.out.println(s13+" - trim\n");

 

            //changing case

            String s14 = s13.toUpperCase();

            System.out.println(s14+" - toUpperCase\n");

            System.out.println(s14.toLowerCase()+" - toLowerCase\n");

}

}

OUTPUT:

CODE: (String Buffer)

public class stringbuffer{

            public static void main(String args[]){

                        String s1=("StringBuuffer");

                        StringBuffer sb = new StringBuffer(s1);

                        System.out.println(sb+" - Simple constructor\n");

                        //length

                        System.out.println(sb.length()+" - Length\n");

                        //capacity

                        System.out.println(sb.capacity()+" - capacity\n");

                        //ensurecapacity

                        StringBuffer s2 = new StringBuffer("khushi");

                        s2.ensureCapacity(21);

                        System.out.println(s2.capacity()+" - "+s2+" - ensurecapacity\n");

                        //charat

                        System.out.println(s2.charAt(3)+" - charAt\n");

                        //setCharAt

                        s2.setCharAt(0,'K');

                        System.out.println(s2+" - setCharAt\n");

                        //setlength

                        s2.setLength(4);

                        System.out.println(s2+" - setLength\n");

                        //delete()

                        s2.delete(3,6);

                        System.out.println(s2+" - delete\n");

                        //delete char at

                        s2.deleteCharAt(2);

                        System.out.println(s2+" - deleteCharAt\n");

                        //append

                        s2.append("hi");

                        System.out.println(s2+" - append\n");

                        //insert

                        s2.insert(2,"us");

                        System.out.println(s2+" - insert\n");

                        //reverse

                        System.out.println(s2.reverse()+" - reverse\n");

                        s2.append("Happy");

                        //replace

                        System.out.println(s2.replace(6,11,"Hello")+" - replace\n");

                        //index of

                        int i=s2.indexOf("h");

                        System.out.println(i+" - indexOf\n");

                        //last index of

                        System.out.println(s2.lastIndexOf("h")+" - lastIndexOf\n");

            }

}

OUTPUT: