Chapter 2d - Char Data Type

The char data type is used to store a single character. The character must be surrounded by single quotes, like 'A' or 'c':

char x = 'a';    
System.out.print(x);

🧪 Try the code out!

The ASCII code

char x = 97;
System.out.println(x);    //Should print 'a'

🧪 Try the code out!

Upper and Lower Case

public class Main
{
 public static void main(String[] args) 
 {
   char ch1 = 'a';
   char ch2 = 'B';
   System.out.println(Character.toUpperCase(ch1));//converts lowercase to uppercase
   System.out.println(Character.toLowerCase(ch2));//converts uppercase to lowercase
 }
}

🧪 Try the code out!

Chars and ASCII In Practice

✍ Try the following examples in this playground

What happens when we try to store a char value in an integer?

public class Main {
    public static void main(String args[]) {
    int val='A';
    System.out.println("val = " +val);
    }`
} 

What happens when we typecast an int value to a char type?

public class Main {
 public static void main(String[] args) {
   int x = 5;
   char y = (char)x;  
   System.out.println(x + y);  
 }
}

What happens we try to add a char to an integer?

Java will take ASCII value of char and add it to the int, so the result will be unpredicted. Try this:

int x = 5;
char y = '5';
System.out.println (x + y);

OUTPUT: 58 (because it will take ASCII value of '5' that is 53 and add it to 5)

What is the output seen when combining int and String variables?

if x = 5 and y = “6”, then output is 56 (string concatenation). Anything added to string is converted to string in java.

public class Main {
 public static void main(String[] args)    
   {   
       int x = 5;
       String y = "6";
       System.out.println(x + y);
   } 
}