Write a Java Program To Count Letters in String

How To Count Letters in String in Java

In the last post, we have discussed how to find character or character position in string in java with simple examples and now here we are going to create a simple example for how to count letters in java string with examples.

So let's start with a useful example for finding the number of letters in a given java String.

The below example gives you a total number of letters count in a given java string i.e (given string is "sun45tt" and letters in this give string is suntt i.e 5).

Java Program to Count Letters in String

class LettersCountInString

{

public static void main(String args[])

{

String str = "sun45tt";

int count = 0; 

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

{

if(Character.isLetter(str.charAt(i)))

{

count++;

}

}

System.out.println(count);

}

}

Output: 5

Here we discussed, how to write a java program to count letters in string with a simple example.

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How Do I Find a Character in a String in Java

 Searching Characters in a String in Java

In the last article, we have learned how do I find a first non-repeated character in string in java and now here we are going to make a java program for how do I find a character in a string with a simple example.

Here we will find the index position of a character given in a java string by using the pre-defined method of a java String Object.

Here we will find the character position in a sting by using the indexOf( ) method of the String class.

So let's start searching for specific character in string.

Find Character in Java String

class FindingCharacterInString

{

public static void main(String args[])

{

String str = "how are you men";

int indexPosition = str.indexOf('a'); //finding character a String

System.out.println("Index Position of character a is  "+indexPosition);

}

}

Output : Index Position of character a is 4

Note the above program for finding a character will give you the first occurrence of the character's position not the second occurrence of a character.

Let's understand by simple example where we again find the character in a string but with a different character.

class FindingCharacterInString

{

public static void main(String args[])

{

String str = "how are you men";

int indexPosition = str.indexOf('o'); //finding character o String

System.out.println("Index Position of character o is  "+indexPosition);

}

}

Output: Index Position of character o is 1

So here we discussed some useful examples for how do i find a character in a String in java.

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How Do You Find The First Non Repeated Character of a String in Java

Find First Non Repeating Character in a String in Java 

Now Here we are going print First non repeated character in String in java through a simple example or java program so that you can understand well.

So let's start a simple java program for find the first non repeated character of a String.

For example, we take a string in  java like String str = "akalsys";

So in above string there is k is a first non repeated character in String.

Java Example for First Non-Repeated Character in String.

class FirstNonRepeatedCharacterInString

{

public static void main(String args[])

{

String str = "akalsys";

for(char ch : str.toCharArray( ))

{

if(str.indexOf(ch) == str.lastIndexOf(ch))

{

System.out.println(ch);

break;

}

}

}

}

Output : k

Above example will you give the k as output.

Here we learned, how to find the first non repeated character in java string with a simple example.

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First "Hello World" Program in Python

 Hello World Program in Python

Here we going to learn a very very simple program or you can say the first program in python programming language which is "Hello World" program. Here we are going to print a simple massage in python programming language, massage is "Hello World".

Hello World Example in Python

x = "Hello World"

print x

Now it will print Hello World on a console when you running python program.

In the above example, x is a variable and print is used to print the message which x is containing i.e Hello World.

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What is NullPointerException in Java with Examples

 Java "NullPointerException" Program

Here we are going to learn what NullPointerException in java with an example. So let's start the simple java null pointer exception program.

When we call any method by using any reference which is assigned null value then nullpointerexception occurs in java. Let's take a simple example of Java NullPointerExcepton which is given below.

NullPointerException Example in Java

class NullPointerExceptionExample

{

public void show()

{

System.out.println("not running");

}

public static void main(String args[])

{

NullPointerExceptionExample npl = null;//assigning null value to this reference

npl.show();

}

}

Now above java program will throw NullPointerException.

So, here we learned what is null pointer exception in java and when it occurs in java programs.

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