public class Main {

public static void main(String[] args) {

printInformation("Hello World");

printInformation("");

printInformation("\t \n");

String helloWorld = "Hello World";

System.out.printf("index of r = %d %n", helloWorld.indexOf('r'));

System.out.printf("index of World = %d %n", helloWorld.indexOf("World"));

System.out.printf("index of l = %d %n", helloWorld.indexOf('l'));

System.out.printf("index of l = %d %n", helloWorld.lastIndexOf('l'));

System.out.printf("index of l = %d %n", helloWorld.indexOf('l',3));

System.out.printf("index of l = %d %n", helloWorld.lastIndexOf('l',8));

String helloWorldLower = helloWorld.toLowerCase();

if (helloWorld.equals(helloWorldLower)){

System.out.println("Values match exactly");

}

if (helloWorld.equalsIgnoreCase(helloWorldLower)){

System.out.println("Values match ignoring cases");

}

if (helloWorld.startsWith("Hello")){

System.out.println("String starts with Hello");

}

if (helloWorld.endsWith("World")){

System.out.println("String ends with World");

}

if (helloWorld.contains("World")){

System.out.println("String contains World");

}

if (helloWorld.contentEquals("Hello World")){

System.out.println("Values match exactly");

}

}

public static void printInformation (String string){

int length = string.length();

System.out.printf("Length = %d %n", length);

if (string.isEmpty()){

System.out.println("String is empty");

return;

}

if (string.isBlank()){

System.out.println("String is Blank");

}

System.out.printf("First char = %c %n", string.charAt(0));

System.out.printf("Last char = %c %n", string.charAt(length-1));

}

}