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// StringDemo.java

// Demonstrates string creation and common string methods in Java.

public class StringDemo {

public static void main(String[] args) {

// String creation using literal

String s = "Hello";

// Convert to uppercase

System.out.println(s.toUpperCase());

// String concatenation

String s2 = s.concat(" World");

System.out.println(s2);

// StringBuilder for mutable strings

StringBuilder sb = new StringBuilder("Java");

sb.append(" Programming");

System.out.println(sb);

}