CODEWITHSUNDEEP
javastring
Nanda
Nanda

Reputation: 1058

How do I convert strings between uppercase and lowercase in Java?

What is the method for converting strings in Java between upper and lower case?

Upvotes: 27

Views: 129948

Answers (6)

Jaime Montoya
Jaime Montoya

Reputation: 7711

Assuming that all characters are alphabetic, you can do this:

From lowercase to uppercase:

// Uppercase letters. 
class UpperCase {  
  public static void main(String args[]) { 
    char ch;
    for(int i=0; i < 10; i++) { 
      ch = (char) ('a' + i);
      System.out.print(ch); 

      // This statement turns off the 6th bit.   
      ch = (char) ((int) ch & 65503); // ch is now uppercase
      System.out.print(ch + " ");  
    } 
  } 
}

From uppercase to lowercase:

// Lowercase letters. 
class LowerCase {  
  public static void main(String args[]) { 
    char ch;
    for(int i=0; i < 10; i++) { 
      ch = (char) ('A' + i);
      System.out.print(ch);
      ch = (char) ((int) ch | 32); // ch is now uppercase
      System.out.print(ch + " ");  
    } 
  } 
}

Upvotes: 1

zubin patel
zubin patel

Reputation: 19

Coverting the first letter of word capital

input:

hello world

String A = hello;
String B = world;
System.out.println(A.toUpperCase().charAt(0)+A.substring(1) + " " + B.toUpperCase().charAt(0)+B.substring(1));

Output:

Hello World

Upvotes: 0

Thorbj&#248;rn Ravn Andersen
Thorbj&#248;rn Ravn Andersen

Reputation: 75426

Yes. There are methods on the String itself for this.

Note that the result depends on the Locale the JVM is using. Beware, locales is an art in itself.

Upvotes: 3

Crickey
Crickey

Reputation: 381

There are methods in the String class; toUppercase() and toLowerCase().

i.e.

String input = "Cricket!";
String upper = input.toUpperCase(); //stores "CRICKET!"
String lower = input.toLowerCase(); //stores "cricket!"

This will clarify your doubt

Upvotes: 23

PeterMmm
PeterMmm

Reputation: 24640

String#toLowerCase and String#toUpperCase are the methods you need.

Upvotes: 35

Fortega
Fortega

Reputation: 19702

String#toLowerCase

Upvotes: 2

Related Questions