Vishnu's Blog

 public access modifier in java Program: class Bird1 {     public String name ;     public void display ()     {         System . out . println ( "The Bird name is " + name ) ;     } } public class Public {     public static void main ( String args [])     {         Bird1 bird = new Bird1 () ;         bird . name = "Eagle" ;         bird . display () ;     }     } /* OUTPUT The Bird name is Eagle */

 private access modifier in java PROGRAM: class Private1 {     private String name ;     public String getName ()     {         return this . name ;     }     public void setName ( String name )     {         this . name = name ;     } } public class private2 {         public static void main ( String [] args ) {         Private1 p1 = new Private1 () ;     p1 . setName ( "Java" ) ;     System . out . println ( p1 . getName ()) ;     } } /* OUTPUT Java */

 String subSequence( ) method in Java PROGRAM: /* SYNTAX Stringname.subSequence(startindex,endindex); */ public class subSequence {         public static void main ( String args [])     {         String s1 = "Hello Java" ;         CharSequence cs = s1 . subSequence ( 4 , 9 ) ; //o Jav                 System . out . println ( cs ) ;             } } /* OUTPUT o Jav */

 String hashCode( ) method in Java PROGRAM: /* SYNTAX Stringname.hashCode(); */ public class hashCode {         public static void main ( String args[])     {         String s1= "Java" ;         String s2= "Programming" ;                 System.out.println(s1.hashCode()) ;         System.out.println(s2.hashCode()) ;     } } /* OUTPUT 2301506 -1615787847 */

 String isEmpty( ) method in Java PROGRAM: /* SYNTAX Stringname.isEmpty(); */ public class isEmpty {         public static void main ( String args [])     {         String s1 = "Java" ;         String s2 = "" ;         boolean b1 = s1 . isEmpty () ;         boolean b2 = s2 . isEmpty () ;         System . out . println ( b1 ) ;         System . out . println ( b2 ) ;     } } /* OUTPUT false true */

 String endsWith( ) Method in Java PROGRAM: /* SYNTAX Stringname.endsWith(String); */ public class endsWith {     public static void main ( String args[])     {         String s1= "Vishnu" ;         boolean b1=s1.endsWith( "u" ) ;         boolean b2=s1.endsWith( "i" ) ;         System.out.println(b1) ;         System.out.println(b2) ;     } } /* OUTPUT true false */

 String startsWith( ) method in Java PROGRAM: /* SYNTAX Stringname.startsWith(String); */ public class startsWith {     public static void main ( String args [])     {         String s1 = "Vishnu" ;         boolean b1 = s1 . startsWith ( "V" ) ;         boolean b2 = s1 . startsWith ( "i" ) ;         System . out . println ( b1 ) ;         System . out . println ( b2 ) ;     } } /* OUTPUT true false */

 String matches( ) method in Java PROGRAM: /* SYNTAX String.matches(regex); */ public class matches {     public static void main ( String args [])     {         String s1 = "Vishnu" ;         String s2 = "^V....u$" ;         boolean b1 = s1 . matches ( s2 ) ;         System . out . println ( b1 ) ;     } } /* OUTPUT true */

 How to convert a String to Char Array PROGRAM: /* SYNTAX String.toCharArray(); */ public class toCharArray {     public static void main ( String args [])     {         String s1 = "Hello Java" ;         char arr []= s1 . toCharArray () ;         for ( int i = 0 ; i < arr . length ; i ++)         {             System . out . println ( arr [ i ]) ;         }     }     } /* OUTPUT H e l l o J a v a */

 String valueOf ( ) method in Java PROGRAM: /* Syntax string.valueOf(value); */ public class valueOf {     public static void main ( String args [])     {         int a = 10 ;         String b = String . valueOf ( a ) ;         System . out . println ( b ) ;     }     } /* OUTPUT 10 */

 String toUpperCase( ) method in Java PROGRAM: /* SYNTAX: string.toUpperCase(); */ class toUpperCase {     public static void main ( String args [])     {         String s1 = "hello java" ;         System . out . println ( s1 . toUpperCase ()) ;     } } /* OUTPUT: HELLO JAVA */

 String toLowerCase ( ) method in Java PROGRAM: /* SYNTAX: string.toLowerCase(); */ class toLowerCase {     public static void main ( String args [])     {         String s1 = "HELLO JAVA" ;         System . out . println ( s1 . toLowerCase ()) ;     } } /* OUTPUT: hello java */

 String split ( ) method in Java  PROGRAM: /* SYNTAX: string.split(String regex); */ class split {     public static void main ( String args [])     {         String s1 = "Hi hello Welcome" ;         String arr []= s1 . split ( " " ) ; //arr[0]=Hi,arr[1]=hello,arr[2]=Welcome         for (String s2:arr )        {             System . out . println (s2) ;        }     } } /* OUTPUT: Hi hello Welcome */

 Program to remove all whitespaces in a String in Java Programming PROGRAM: public class RemoveAllWhiteSpace {         public static void main ( String args [])     {         String s1 = "    Hello     Java     " ;         String s2 = s1 . replaceAll ( " \\ s" , "" ) ; //HelloJava         System . out . println ( s2 ) ;     } } /* OUTPUT: HelloJava    */

 String trim( ) method in Java PROGRAM: /*   SYNTAX: string.trim(); */ class trim {     public static void main ( String args [])     {         String s1 = "    Hello Java     " ;         System . out . println ( s1 . trim ()) ;     } } /* OUTPUT: Hello Java */

 String compareToIgnoreCase ( ) method in Java PROGRAM: /* SYNTAX string.compareToIgnoreCase(String s1); */ public class compareToIgnoreCase {         public static void main ( String args [])     {         String s1 = "Hello Java" ;         String s2 = "Hello java" ;                 System . out . println ( s1 . compareToIgnoreCase ( s2 )) ; //0         System . out . println ( s1 . compareTo ( s2 )) ; //-32             } } /* OUTPUT 0 */

 String compareTo method( ) in Java PROGRAM: /* SYNTAX string.compareTo(String s1); */ public class compareTo {         public static void main ( String args [])     {         String s1 = "Hello Java" ;         String s2 = "Hello Java" ;         String s3 = "Hello Python" ;         System . out . println ( s1 . compareTo ( s2 )) ; //0         System . out . println ( s1 . compareTo ( s3 )) ; //-6         System . out . println ( s3 . compareTo ( s1 )) ; //6     } } /* OUTPUT 0 -6 6 */

 String indexOf( ) method in Java PROGRAM: /* SYNTAX string.indexOf(char ch); */ public class indexOf {         public static void main ( String args[])     {         String s1= "Hello Java" ;         System.out.println(s1.indexOf( 'H' )) ; //0         System.out.println(s1.indexOf( 'J' )) ; //6         System.out.println(s1.indexOf( 'a' )) ; //7     } } /* OUTPUT 0 6 7 */

  String charAt( ) method in Java PROGRAM: /* SYNTAX string.charAt(int index); */ public class charAt {         public static void main ( String args [])     {         String s1 = "Hello Java" ;         System . out . println ( s1 . charAt ( 0 )) ; //H         System . out . println ( s1 . charAt ( 6 )) ; //J         System . out . println ( s1 . charAt ( 9 )) ; //a     } } /* OUTPUT H J a */

 String replaceFirst( ) method in Java   PROGRAM: /* Syntax string.replaceFirst(String regex,String replacement); */ class ReplaceFirst {     public static void main ( String args [])     {         String s1 = "aabbddeeaa" ;         String s2 = "hello123java12" ;         System . out . println ( s1 . replaceFirst ( "aa" , "ee" )) ; //eebbddeeaa         System . out . println ( s2 . replaceFirst ( " \\ d+" , " " )) ; //hello java12                 } } /* OUTPUT eebbddeeaa hello java12  */

 String replaceAll( ) method in Java PROGRAM: /* Syntax string.replaceAll(String regex,String replacement); */ class ReplaceAll {     public static void main ( String args [])     {         String s1 = "aabbddeeaa" ;         String s2 = "hello123java" ;         System . out . println ( s1 . replaceAll ( "aa" , "ee" )) ; //eebbddeeee         System . out . println ( s2 . replaceAll ( " \\ d+" , " " )) ; //hello java                 } } /* OUTPUT eebbddeeee hello java  */

 String replace method in java PROGRAM: /* Syntax string.replace(char oldchar,char newChar); */ class ReplaceString {     public static void main ( String args [])     {         String s1 = "Hello world" ;         System . out . println ( s1 . replace ( 'H' , 'C' )) ; //Cello world         System . out . println ( s1 . replace ( "Hello" , "Hi" )) ; //Hi world         System . out . println ( s1 . replace ( 'Z' , 'C' )) ; //Hello world     } } /* OUTPUT Cello world Hi world Hello world  */

 How to join two or more strings separated by delimiters PROGRAM: /* SYNTAX String.join(CharSequence delimiter,CharSequence..elements);  */ public class joinString {     public static void main ( String args [])     {         String s1 = "Hi" ;         String s2 = "Hello" ;         String s3 = "Welcome" ;         String s4 = String . join ( " " , s1 , s2 , s3 ) ;         System . out . println ( s4 ) ;     }     } /* OUTPUT Hi Hello Welcome */

 substring method in java Program /*Syntax   string.substring(int startIndex, int endIndex); */ public class substring {     public static void main ( String args [])     {         String s1 = "Hello Java" ;         System . out . println ( s1 . substring ( 0 , 5 )) ; //0,5-1=>0,4//Hello         System . out . println ( s1 . substring ( 0 )) ; //Hello Java         System . out . println ( s1 . substring ( 6 )) ; //Java     }     } /* Hello Hello Java Java  */

How to check the given string is present or not  in another string using contains method in java PROGRAM: /*Syntax string.contains(CharSequence); */ public class Contains {     public static void main ( String args [])     {         String s1 = "Hello Java" ;         boolean b1 = s1 . contains ( "Java" ) ;         System . out . println ( b1 ) ; //true         boolean b2 = s1 . contains ( "Python" ) ;         System . out . println ( b2 ) ; //false     } } /* true false  */

 How to create a String using new Keyword PROGRAM: public class CreatingStringUsingNew {     public static void main ( String args [])     {         String s1 = "Hello" ;         String s2 = new String ( "Java" ) ;         System . out . println ( s2 ) ;     }     }

 How to compare two Strings in Java PROGRAM: public class CompareString {     public static void main ( String args [])     {         String s1 = "hi" ;         String s2 = "hello" ;         String s3 = "hello" ;         boolean b1 = s1 . equals ( s2 ) ; //false         boolean b2 = s2 . equals ( s3 ) ; //true         System . out . println ( "Is Strings s1 and s2 are equal ? " + b1 ) ;         System . out . println ( "Is Strings s2 and s3 are equal ? " + b2 ) ;                     }     } /* OUTPUT Is Strings s1 and s2 are equal ? false Is Strings s2 and s3 are equal ? true */

 How to join Three Strings in Java PROGRAM: public class ConcatStrings {     public static void main ( String args[])     {         String s1= "hi" ;         String s2 = "hello" ;         String s3 = "Welcome" ;         String s4 =s1.concat(s2) ; //hihello         String s5 = s4 . concat ( s3 ) ; //hihelloWelcome         System . ou t .p r intln( s 1+ s2+s3) ; //hihelloWelcome         System . out . println ( s5 ) ;             }     } /* OUTPUT hihelloWelcome hihelloWelcome */

 How to find length of a String in Java PROGRAM: public class StringLength {     public static void main ( String args [])     {         String s1 = "hi" ;         String s2 = "hello" ;         String s3 = "Welcome" ;         System . out . println ( s1 + " Length is " + s1 . length ()) ; //2         System . out . println ( s2 + " Length is " + s2 . length ()) ; //5         System . out . println ( s3 + " Length is " + s3 . length ()) ; //7     }     } /* hi Length is 2 hello Length is 5 Welcome Length is 7 */

 How to create a String in Java PROGRAM: public class CreateAString {     public static void main ( String args [])     {         String s1 = "hi" ;         String s2 = "hello" ;         String s3 = "Welcome" ;         System . out . println ( s1 + " " + s2 + " " + s3 ) ;     }     } /* hi hello Welcome */

 Default Constructor in Java (OOPS) PROGRAM: class DefaultConstructor {     int a = 10 ;     int b = 20 ;     public static void main ( String args [])     {         DefaultConstructor obj = new DefaultConstructor () ;         System . out . println ( "a value is " + obj . a ) ;         System . out . println ( "b value is " + obj . b ) ;     } } /* a value is 10 b value is 20 */