Java Character toLowerCase() Method

The toLowerCase(char ch) method of Character class converts the given character argument to the lowercase using a case mapping information which is provided by the Unicode Data file. It should be noted that Character.isLowerCase(Character.toLowerCase(ch)) may not always return true for some characters like symbols or ideographs.

In actual, the String.toLowerCase() can be used to map the characters into lowercase. There are various benefits of String case mapping as compared to Character case mapping. String case mapping can be used to perform local-sensitive mappings, context-sensitive mappings whereas the Character case mapping cannot be used.

Syntax

Parameter

ch: It is the character that needs to be tested.

Return Value

The toLowerCase(char ch)method returns a lowercase of the given character if any. Otherwise, this method returns the character itself.

Example 1

public class JavaCharactertoLowerCaseExample1 {
    public static void main(String[] args) {
      // Create four char primitives.
      char ch1, ch2, ch3, ch4;
      // Assign the values to ch1 and c.
      ch1 = 'F';
      ch2 = 'n';
      // Assign the lowercase of ch1 and ch2 to ch and ch4 respectively.
      ch3 = Character.toLowerCase(ch1);
      ch4 = Character.toLowerCase(ch2);
      String str1 = "The lowercase for the first character '" + ch1 + "' is given as: " + ch3;
      String str2 = "The lowercase for the second character '" + ch2 + "' is given as: " + ch4;
      // Print the values for ch3 and ch4.
      System.out.println( str1 );
      System.out.println( str2 );
      }
}

Test it Now

Output:

The lowercase for the first character 'F' is given as: f
The lowercase for the second character 'n' is given as: n

Example 2

import java.util.Scanner;
public class JavaCharactertoLowerCaseExample2 {
  public static void main(String[] args) {
    // Ask the user to enter the first input.
       System.out.print("Enter the first input:");
    // Use Scanner class to get the user.
       Scanner s = new Scanner(System.in);
       char[] value1 = s.nextLine().toCharArray();
    // Convert the given user input into lower case.
      for(char ch1:value1){
      char lower1 = Character.toLowerCase(ch1);
    // Print the result
       System.out.println("The character "+ ch1 +" is converted in the lowercase as: " +lower1); 
    // Ask the user to enter the second input.
       System.out.print("Enter the second input:");          
        char[] value2 = s.nextLine().toCharArray();
        for(char ch2:value2){
        char lower2 = Character.toLowerCase(ch2);
        System.out.println("The character "+ ch2 +" is converted in the lowercase as: " +lower2);}		
	}
    } 
}

Output:

Enter the first input:T
The character T is converted in the lowercase as: t
Enter the second input:i
The character i is converted in the lowercase as: i

Java Character toLowerCase()Method

The toLowerCase(int codePoint) method of Character class converts the given character (Unicode code point) argument to the lowercase using a case mapping information which is provided by the Unicode Data file.

It should be noted that Character.isLowerCase(Character.toLowerCase(codePoint)) may not always return true for some characters like symbols or ideographs.

Syntax

Parameter

The above method requires only one parameter:

a.)The codePoint(Unicode code point) which is the character that needs to be tested.

Return Value

The toLowerCase(int codePoint)method returns a lowercase of the given character if any. Otherwise, this method returns the character itself.

Example 1

public class JavaCharactertoLowerCaseExample_1 {
  public static void main(String[] args) {
    // initialize two codePoints.
       int codepoint1 = 87;
       int codepoint2 = 90;
    //  Convert the codepoints to char primitives.
        char ch1 = (char)codepoint1;
        char ch2 = (char)codepoint2;
    // Convert the code point to lower case respectively.
	char lower1 = Character.toLowerCase(ch1);
        char lower2 = Character.toLowerCase(ch2);
    // Print the result.
System.out.println("The character '" + ch1 + "' can be represented in lower case as " + lower1);
System.out.println("The character '" + ch2 + "' can be represented in lower case as " + lower2);
	}
}

Test it Now

Output:

The character 'W' can be represented in lower case as w
The character 'Z' can be represented in lower case as z

Example 2

public class JavaCharactertoLowerCaseExample_2 {
  public static void main(String[] args) {
    // initialize two codePoints.
       int codepoint1 = 121;
       int codepoint2 = 95;
    //  Convert the codepoints to char primitives.
        char ch1 = (char)codepoint1;
        char ch2 = (char)codepoint2;
    // Convert the code point to lower case respectively.
        char lower1 = Character.toLowerCase(ch1);
        char lower2 = Character.toLowerCase(ch2);
    // Print the result.
    String str1 = "The character '" + ch1 + "' can be represented in lower case as " + lower1;
    String str2 = "The character '" + ch2 + "' can be represented in lower case as " + lower2;
    System.out.println(str1);
    System.out.println(str2);
	}
}

Test it Now

Output:

The character 'y' can be represented in lower case as y
The character '_' can be represented in lower case as _

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