Java - String String Case

Introduction

To convert a string to lower and upper case, use the toLowerCase() and the toUpperCase() methods, respectively.

For example, "Hello".toUpperCase() will return the string "HELLO", whereas "Hello".toLowerCase() will return the string "hello".

String objects are immutable.

toLowerCase() or toUpperCase() leave the content of the original object unchanged.

Java creates a new String object with the identical content as the original String object with the cases of the original characters changed.

The following snippet of code creates three String objects:

Demo

public class Main {
  public static void main(String[] args) {
    String str1 = new String("Hello"); // str1 contains "Hello"
    String str2 = str1.toUpperCase();  // str2 contains "HELLO"
    String str3 = str1.toLowerCase();  // str3 contains "hello"
    System.out.println(str1);/*  w ww .j ava  2  s .c  om*/
    System.out.println(str2);
    System.out.println(str3);
  }
}

Result

Related Topics

• String case counter

Exercise

• Write code to Capitalizes the first letter of the given string.
• Write code to capitalize a String and handle the null input
• Write code to decapitalize a string
• Write code to Capitalizes a String changing the first letter to title case as per Character#toTitleCase(char)
• Write code to convert first Char Upper Case using StringBuffer
• Write code to convert string to Lower Case using Character.toLowerCase()
• Write code to upper case First Letter and handle null value
• Write code to check if a string ends With another string Ignore Case
• Write code to compare two string for equal Ignore Case using conditional operator
• Write code to check if a string starts With another string ignore case
• Write code to lowercase All characters in a string by checking ASCII code
• Write code to uppercase All characters in a string
• Write code to change First Character To Lower Case
• Write code to convert string to Title Case
• Write code to Return true if the given string contains at least one uppercase letter.
• Write code to Return true if the given letter is uppercase.
• Write code to Return the given string with the first letter converted to lower case.
• Write code to Return true if the given string starts with an uppercase letter.
• Write code to convert byte array to to Hex String in Upper Case
• Write code to convert camel case Pascal case
• Write code to convert camel case to underscore
• Write code to convert pascal case to Camel case
• Write code to split camel case strings into normal strings with spaces using regex.
• Write code to convert first letter to Lowercase
• Write code to convert first letter to Uppercase
• Write code to Return the provided text with its first letter in upper or lower case, depending on what is provided for the "upper" parameter.
• Write code to compare two string for equal ignore Case And Space and handle null value
• Write code to create function and check if a string starts With Upper Case
• Write code to convert spaced separated string to Title Case
• Write code to Determine if the string has at least one letter in upper case
• Write code to convert a String to Sentence Case
• Write code to split Camel Case String with Regex
• Write code to Convert dash To Camel Case
• Write code to check if a string is All Lower Case
• Write code to check if a string is All Upper Case
• Write code to swap Case
• Write code to to Lower Case First One
• Write code to to Upper Case First One
• Write code to decamelize a string
• Write code to camelize a string by separator
• Write code to camelize string by separator
• Write code to uncamel - uncamelize string

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