package strings;

public class JavaString {

public static void main(String[] args) {

String str = " Java Programming ";

// 1. length()

System.out.println("Length: " + str.length());

// 2. trim()

String trimmed = str.trim();

System.out.println("Trimmed: '" + trimmed + "'");

// 3. toUpperCase() and toLowerCase()

System.out.println("Uppercase: " + trimmed.toUpperCase());

System.out.println("Lowercase: " + trimmed.toLowerCase());

// 4. charAt()

System.out.println("Character at index 2: " + trimmed.charAt(2));

// 5. substring()

System.out.println("Substring (5 to 11): " + trimmed.substring(5, 11));

// 6. contains()

System.out.println("Contains 'gram'? " + trimmed.contains("gram"));

// 7. equals() and equalsIgnoreCase()

String str2 = "java programming";

System.out.println("Equals: " + trimmed.equals(str2));

System.out.println("Equals Ignore Case: " + trimmed.equalsIgnoreCase(str2));

// 8. startsWith() and endsWith()

System.out.println("Starts with 'Java': " + trimmed.startsWith("Java"));

System.out.println("Ends with 'ing': " + trimmed.endsWith("ing"));

// 9. indexOf()

System.out.println("Index of 'a': " + trimmed.indexOf('a'));

// 10. replace()

System.out.println("Replace 'a' with '*': " + trimmed.replace('a', '*'));

// 11. split()

String[] words = trimmed.split(" ");

System.out.println("Split by space:");

for (String word : words) {

System.out.println("- " + word);

}

// 12. isEmpty() and isBlank() (Java 11+)

String emptyStr = "";

System.out.println("Is empty: " + emptyStr.isEmpty());

String blankStr = " ";

System.out.println("Is blank: " + blankStr.isBlank());

}

}