how to make all the characters uppercase in java code example

Example 1: how to make a char uppercase in java

char q = Character.toUpperCase('d');

Example 2: capitalize string java

String str = "hello world!";

// capitalize first letter
String output = str.substring(0, 1).toUpperCase() + str.substring(1);

// print the string
System.out.println(output);
// Hello world!