Determine character is uppercase

Complete source code below will show you, how to determine character is uppercase or not in java.

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COMPLETE SOURCE CODE FOR : DetermineCharacterIsUppercase.java
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public class DetermineCharacterIsUppercase
{
public static void main(String[]args)
{
 //Create a uppercase character using char with value(B)
 //You can try change it's value to letter(b)
 char a='B';

 //Determine created character is uppercase or not
 //using method isUpperCase from class Character.
 //isUpperCase is a static method, so we don't need to create object when
 //we want to use it.
 if(Character.isUpperCase(a))
 {
  //Print (It is an uppercase) if character is an uppercase
  System.out.println("It is an uppercase");
 }
 else
 {
  //Print (It is not an uppercase) if character is not an uppercase
  System.out.println("It is not an uppercase");
 }
}
}

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JUST COMPILE AND EXECUTE IT
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Convert String to uppercase

Complete source code below will show you, how to convert a String to uppercase.

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COMPLETE SOURCE CODE FOR : ConvertStringToUppercase.java
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public class ConvertStringToUppercase
{
public static void main(String[]args)
{
 //Create a String
 String a="Hi everybody!";

 //Convert created String to uppercase
 a=a.toUpperCase();

 //Print the String
 System.out.println(a);
}
}

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JUST COMPILE AND EXECUTE IT
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Convert uppercase to lowercase in java

Source code below will convert uppercase(HELLO WORLD) to lowercase(hello world)

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COMPLETE SOURCE CODE FOR : ConvertUppercaseToLowercase.java
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public class ConvertUppercaseToLowercase
{
public static void main(String[]args)
{
 String a="HELLO WORLD";
  
    //CONVERT HELLO WORLD TO hello world
    String b=a.toLowerCase();
    a=b;
    System.out.println(a);
}
}

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JUST COMPILE AND EXECUTE IT
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Convert lowercase to uppercase in java

Source code below will convert lowercase (hello world) to uppercase (HELLO WORLD)

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COMPLETE SOURCE CODE FOR : ConvertLowerCaseToUpperCase.java
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public class ConvertLowerCaseToUpperCase
{
public static void main(String[]args)
{
 String a="hello world";

 //CONVERT hello world TO HELLO WORLD
 String b=a.toUpperCase();
 System.out.println(b);
}
}

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JUST COMPILE AND EXECUTE IT
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