EXAMPLE ON STRING HANDLING FUNCTIONS in JAVA

EXAMPLE -1

// Demonstrate toUpperCase() and toLowerCase().

class ChangeCaseDemo {

  public static void main(String args[])

  {

    String s = "This is a satya.";

    System.out.println("Original: " + s);

    String uppr = s.toUpperCase();

    String lwr = s.toLowerCase();

    System.out.println("Uppercase: " + uppr);

    System.out.println("Lowercase: " + lwr);

  }

}

OUTPUT

C:\SATYA>javac ChangeCaseDemo.java

C:\SATYA>java ChangeCaseDemo

C:\satya>

Original:This is Satya

Uppercase:THIS IS SATYA

Lowercase:this is satya

EXAMPLE -2

// Using concatenation to prevent long lines.

class ConCatDemo {

  public static void main(String args[]) {

    String longStr = "This is object oriented programming " +

      "through java " +

      "by v.satya" ;

    System.out.println(longStr);

  }

}

OUTPUT

C:\SATYA>javac ConCatDemo.java

C:\SATYA>java ComCatDemo

C:\satya>

This is object oriented program through java by V.Satya

EXAMPLE -3

// Demonstrate delete() and deleteCharAt()

class deleteDemo {

  public static void main(String args[]) {

    StringBuffer sb = new StringBuffer("This is oops through java.");

    sb.delete(4, 9);

    System.out.println("After delete: " + sb);

    sb.deleteCharAt(0);

    System.out.println("After deleteCharAt: " + sb);

  }

}

OUTPUT

C:\SATYA>javac deleteDemo.java

C:\SATYA>java deleteDemo

C:\satya>

After delete:thisops through java.

After deletechartAt:hisops through java.

EXAMPLE -4

// Demonstrate equals() and equalsIgnoreCase().

class equalsDemo {

  public static void main(String args[]) {

    String s1 = "Satya";

    String s2 = "Satya";

    String s3 = "Good-bye";

    String s4 = "SATYA";

    System.out.println(s1 + " equals " + s2 + " -> " +

                       s1.equals(s2));

    System.out.println(s1 + " equals " + s3 + " -> " +

                       s1.equals(s3));

    System.out.println(s1 + " equals " + s4 + " -> " +

                       s1.equals(s4));

    System.out.println(s1 + " equalsIgnoreCase " + s4 + " -> " +

                       s1.equalsIgnoreCase(s4));

  }

}

OUTPUT

C:\SATYA>javac equalsDemo.java

C:\SATYA>java equalsDemo

C:\satya>

Satya equals Satya->true

Satya equals Good-bye->false

Satya equals SATYA->false

Satya equals ignorecase SATYA->true

EXAMPLE -5

// equals() vs ==

class EqualsNotEqualTo {

  public static void main(String args[]) {

    String s1 = "satya";

    String s2 = new String(s1);

    System.out.println(s1 + " equals " + s2 + " -> " + 

                       s1.equals(s2));

    System.out.println(s1 + " == " + s2 + " -> " + (s1 == s2));

  }

}

OUTPUT

C:\SATYA>javac EqualIsNotEqualTo.java

C:\SATYA>java EqualsNotEqualTo

C:\satya>

Satya equals satya ->true

Satya==satya->false

EXAMPLE -6

class getCharsDemo {

  public static void main(String args[]) {

    String s = "this is satya.";

    int start = 10;

    int end = 14;

    char buf[] = new char[end - start];

    s.getChars(start, end, buf, 0);

    System.out.println(buf);

  }

}

OUTPUT

C:\SATYA>javac getCharsDemo.java

C:\SATYA>java getCharDemo

C:\satya>

jayb

EXAMPLE -7

// Demonstrate indexOf() and lastIndexOf().

class indexOfDemo {

  public static void main(String args[]) {

    String s = "this is object oriented programming through java " +

               "by v.satya";

    System.out.println(s);

    System.out.println("indexOf(t) = " +

                       s.indexOf('t'));

    System.out.println("lastIndexOf(t) = " +

                       s.lastIndexOf('t'));

    System.out.println("indexOf(the) = " +

                       s.indexOf("the"));

    System.out.println("lastIndexOf(the) = " +

                       s.lastIndexOf("the"));

    System.out.println("indexOf(t, 10) = " +

                       s.indexOf('t', 10));

    System.out.println("lastIndexOf(t, 60) = " +

                       s.lastIndexOf('t', 60));

    System.out.println("indexOf(the, 10) = " +

                       s.indexOf("the", 10));

    System.out.println("lastIndexOf(the, 60) = " +

                       s.lastIndexOf("the", 60));

  }

}

OUTPUT

C:\SATYA>javac indexOfDemo.java

C:\SATYA>java indexOfDemo

C:\satya>

This is object oriented program through java by V.Satya

Index<t>=0

Lastindex<t>==36

Indexof<the>=-1

Last index of<the>=-1

Indexof<t,10>=13

Last index of<t,60>=36

Indexof<the,10>=-1;

Last index of <the,60>=-1

EXAMPLE -8

// Demonstrate insert().

class insertDemo {

  public static void main(String args[]) {

    StringBuffer sb = new StringBuffer("I like!");

    sb.insert(2, "love ");

    System.out.println(sb);

  }

}

OUTPUT

C:\SATYA>javac insertDemo.java

C:\SATYA>java insertDemo

C:\satya>

I Love Like!

EXAMPLE -9

// Construct one String from another.

class MakeString {

  public static void main(String args[]) {

    char c[] = {'V', 'i', 'j', 'a',’y’};

    String s1 = new String(c);

    String s2 = new String(s1);

    System.out.println(s1);

    System.out.println(s2);

  }

}

OUTPUT

C:\SATYA>javac MakeString.java

C:\SATYA>java MakeString

C:\satya>

‘V’,’I’,’J’,’A’,’Y’

EXAMPLE -10

// Demonstrate replace()

class replaceDemo {

  public static void main(String args[]) {

    StringBuffer sb = new StringBuffer("This is satya.");

    sb.replace(5, 7, "was");

    System.out.println("After replace: " + sb);

  }

}

OUTPUT

C:\SATYA>javac replaceDemo.java

C:\SATYA>java replaceDemo

C:\satya>

After replace:this was satya

EXAMPLE -11

// Using reverse() to reverse a StringBuffer.

class ReverseDemo {

  public static void main(String args[]) {

    StringBuffer s = new StringBuffer("java");

    System.out.println(s);

    s.reverse();

    System.out.println(s);

  }

}

OUTPUT

C:\SATYA>javac ReverseDemo.java

C:\SATYA>java ReverseDemo

C:\satya>

Java

avaj

EXAMPLE -12

// Demonstrate charAt() and setCharAt().

class setCharAtDemo {

  public static void main(String args[]) {

    StringBuffer sb = new StringBuffer("satya");

    System.out.println("buffer before = " + sb);

    System.out.println("charAt(1) before = " + sb.charAt(1));

      sb.setCharAt(1, 'i');

      sb.setLength(2);

      System.out.println("buffer after = " + sb);

      System.out.println("charAt(1) after = " + sb.charAt(1));

  }

}

OUTPUT

C:\SATYA>javac setCharAtDemo.java

C:\SATYA>java setCharAtDemo

C:\satya>

Buffer before=satya

charAt<1>before=i

buffer after=vi

charAt<1>after=i

EXAMPLE -13

// A bubble sort for Strings.

class SortString {

  static String arr[] = {

    "satya", "isaac", "manasa", "joshna"

  };

  public static void main(String args[]) {

    for(int j = 0; j < arr.length; j++) {

      for(int i = j + 1; i < arr.length; i++) {

        if(arr[i].compareTo(arr[j]) < 0) {

          String t = arr[j];

          arr[j] = arr[i];

          arr[i] = t;

        }

      }

      System.out.println(arr[j]);

    }

  }

}

OUTPUT

C:\SATYA>javac setCharAtDemo.java

C:\SATYA>java setCharAtDemo

C:\satya>

Isaac

Joshna

Manasa

satya

EXAMPLE -14

// StringBuffer length vs. capacity.

class StringBufferDemo {

  public static void main(String args[]) {

    StringBuffer sb = new StringBuffer("satya");

    System.out.println("buffer = " + sb);

    System.out.println("length = " + sb.length());

    System.out.println("capacity = " + sb.capacity());

  }

}

OUTPUT

C:\SATYA>javac ReverseDemo.java

C:\SATYA>java ReverseDemo

C:\satya

Buffer=satya

Length==5

Capacity=21

EXAMPLE -16

// Construct string from subset of char array.

class SubStringConsDemo {

  public static void main(String args[]) {

    byte ascii[] = {65, 66, 67, 68, 69, 70 };

    String s1 = new String(ascii);

    System.out.println(s1);

    String s2 = new String(ascii, 2, 3);

    System.out.println(s2);

  }

OUTPUT

C:\SATYA>javac SubStringConsDemo.java

C:\SATYA>java SubStringConsDemo

ABCDEF

CDE

C:\satya>