upper case string java code example

Example 1: 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!

Example 2: java uppercase

"Hello World".toUpperCase()

Example 3: java lower case to upper case

toUpperCase()