List Of BlueJ Java Programs With Characters Class For ICSE And ISC Students

Programs on characters using Java language for ICSE and ISC students are posted here. The programs can be executed on BlueJ or any other editors. Here you will get links to number of Character class programs along with explanation. Hope it will help students.

To view the programs, click on the links

ASCII Code And Equivalent Character

Case of a character

Changing Case of Character

Digit Checking in a Sentence

Display All Alternate Characters From A to Z

Displaying Character Corresponding To Number

Displaying 10th Character from Entered Character

Enter a character and display the next 5 characters

Letter Checking in a Sentence

Letter or Digit Checking in a Sentence

To Get More Programs:

ISC Practical Papers With Solution

ISC Theoretical Papers With Solution 

ICSE Theoretical Papers With Solution 

Program to find the case of a character

In this program, user will enter any character and the program will show whether the entered character is in upper case or in lower case.

The first program is done comparing the ASCII value of the entered character. ASCII values of 'A' to 'Z' are within 65 to 90 and ASCII values of 'a' to 'z' are within 97 to 122.

import java.io.*;

class CaseChecking

{

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

char ch;

public void take() throws Exception

{

 System.out.print("\nEnter the character:");

ch=(char)br.read();

if (ch>=65 && ch<=90)

System.out.println("Entered Character is in Upper Case.");

else

System.out.println("Entered Character is in Lower Case.");

}

public static void main(String args[]) throws Exception

{

 CaseChecking ob=new CaseChecking();

ob.take();

}

}

The same program can be done using Character class static methods 'boolean isUpperCase()' or 'boolean isLowerCase()'.

import java.io.*;

class CaseChecking

{

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

char ch;

public void take() throws Exception

{

 System.out.print("\nEnter the character:");

ch=(char)br.read();

if (Character.isUpperCase(ch))

System.out.println("Entered Character is in Upper Case.");

else

System.out.println("Entered Character is in Lower Case.");

}

public static void main(String args[]) throws Exception

{

 CaseChecking ob=new CaseChecking();

ob.take();

}

}

Related Post: Programs on Character Class

Changing Case of Character in BlueJ

import java.io.*;

class CaseChanging

{

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

char ch;

public void take() throws Exception

{

 System.out.print("\nEnter the character:");

ch=(char)br.read();

System.out.println("Entered Character is:”+ch);

ch=Character.toUpperCase(ch);

System.out.println("Modified Character is:”+ch);

}

public static void main(String args[]) throws Exception

{

 CaseChanging ob=new CaseChanging ();

ob.take();

}

}

Related Post: Programs on Character Class

BlueJ Program on Letter Checking in a sentence

import java.io.*;

class LetterCh

{

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

int I,len,c=0;

char ch;

public void showLetters () throws Exception

{

 System.out.print("\nEnter the sentence:");

String str=br.readLine();

str=str.trim();

len=str.length ();

for (i=0;i< len;i++)

{

ch= str.charAt(i);

if(Character.isLetter(ch))

c++;

}

System.out.print(“Total number of Letters in the sentence=”+c);

}

public static void main(String args[])

{

LetterCh ob=new LetterCh ();

ob. showLetters();

}

}

Related Post: Programs on Character Class

BlueJ Program on Digit Checking in a sentence

class DigitCh

{

int I,len,c=0;

char ch;

public void showDigits (String str)

{

str=str.trim();

len=str.length ();

for (i=0;i< len;i++)

{

ch= str.charAt(i);

if(Character.isDigit(ch))

c++;

}

System.out.print(“Total number of digits in the sentence=”+c);

}

public static void main(String args[])

{

DigitCh ob=new DigitCh ();

ob. showDigits(“abcd123”);

}

}

Related Post: Programs on Character Class

BlueJ Program on Letter or Digit Checking in a sentence

import java.io.*;

class LetterCh

{

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

int I,len,c=0;

char ch;

public void showLettersDigits () throws Exception

{

 System.out.print("\nEnter the sentence:");

String str=br.readLine();

str=str.trim();

len=str.length ();

for (i=0;i< len;i++)

{

ch= str.charAt(i);

if(Character.isLetterOrDigit(ch))

c++;

}

System.out.print(“Total number of Letters and Digits in the sentence=”+c);

}

public static void main(String args[])

{

LetterCh ob=new LetterCh ();

ob. showLettersDigits();

}

}

Related Post: Programs on Character Class

Character Class in Java

Character is a class of java.lang package. Character  is a simple wrapper class and constructor of this class is Character (char ch), where the char ch is wrapped by the Character  object. Character class has several static methods which are used for several purposes

Return Type	Prototype	Use
boolean	static boolean isDigit (char ch)	Returns true if the argument character is digit otherwise false
boolean	static boolean isLetter (char ch)	Returns true if the argument character is an alphabet  otherwise false
boolean	static boolean isLetterOrDigit (char ch)	Returns true if the argument character is digit or alphabet otherwise false
boolean	static boolean isLowerCase (char ch)	Returns true if the argument character is a lowercase letter otherwise false
boolean	static boolean isUpperCase (char ch)	Returns true if the argument character is a uppercase letter otherwise false
boolean	static boolean isWhitespace (char ch)	Returns true if the argument character is a white space otherwise false
char	static char toLowerCase (char ch)	Returns lower case equivalent of the argument  character if it is in upper case otherwise returns the same value
char	static char toUpperCase (char ch)	Returns upper case equivalent of the argument  character if it is in lower case otherwise returns the same value

Related Post: Programs on Character Class