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public class StringConstructor {

 public static void main(String[] args) {
 // Using String literal
 String str1 = "Hello, World!";
 
 // Using String constructor with char array
 char[] charArray = {'H', 'e', 'l', 'l', 'o'};
 String str2 = new String(charArray);
 
 // Using String constructor with byte array
 byte[] byteArray = {72, 101, 108, 108, 111};
 String str3 = new String(byteArray);
 
 // Using String constructor with another String
 String original = "Java";
 String str4 = new String(original);
 
 // Using String constructor with StringBuffer
 StringBuffer stringBuffer = new StringBuffer("Programming");
 String str5 = new String(stringBuffer);
 
 // Outputting the strings
 System.out.println("String 1: " + str1);
 System.out.println("String 2: " + str2);
 System.out.println("String 3: " + str3);
 System.out.println("String 4: " + str4);
 System.out.println("String 5: " + str5);
 }
}



5
public class StringMethod {

 public static void main(String[] args) {

 // Character extraction
 String str = "Hello, World!";
 char firstChar = str.charAt(0);
 char lastChar = str.charAt(str.length() - 1);
 String substring = str.substring(7, 12);
 System.out.println("Original String:" + str);
 System.out.println("Character extraction:");
 System.out.println("First character: " + firstChar);
 System.out.println("Last character: " + lastChar);
 System.out.println("Substring: " + substring);
 
 // String comparison
 String str1 = "apple";
 String str2 = "banana";
 int compareResult = str1.compareTo(str2);
 System.out.println("\nString comparison:");
 System.out.println("str1:" +str1+ " srt2:"+str2+ " Comparison of str1 and str2:" + 
compareResult);
 if (compareResult < 0) {
 System.out.println(str1 + " comes before " + str2);
 } else if (compareResult > 0) {
 System.out.println(str1 + " comes after " + str2);
 } else {
 System.out.println(str1 + " is equal to " + str2);
 }
 
 // String search
 String sentence = "The quick brown fox jumps over the lazy dog";
 boolean containsFox = sentence.contains("fox");
 int indexOfDog = sentence.indexOf("dog");
 System.out.println("\nString search:");
 System.out.println("Contains 'fox': " + containsFox);
System.out.println("Index of 'dog': " + indexOfDog);

 

 // String modification
 String original = " Hello, World! ";
 String trimmed = original.trim();
 String replaced = original.replace("Hello", "Hi");
 String lowerCase = original.toLowerCase();
 String upperCase = original.toUpperCase();
 System.out.println("\nString modification:");
 System.out.println("Trimmed string: '" + trimmed + "'");
 System.out.println("Replaced string: '" + replaced + "'");
 System.out.println("Lowercase string: '" + lowerCase + "'");
 System.out.println("Uppercase string: '" + upperCase + "'");
 }
}



6
public class StringBufferMethods {

 public static void main(String[] args) {

 // Creating a StringBuffer object
 StringBuffer stringb1 = new StringBuffer("Hello");
 System.out.println("Original String:"+stringb1);
 // Append method
 stringb1.append(" World!");
 System.out.println("After append:"+stringb1);
 // Insert method
 stringb1.insert(5, ", Java");
 System.out.println("After insert:"+stringb1);
 // Delete method
 stringb1.delete(5, 11);
 System.out.println("After delete:"+stringb1);
 // Reverse method
 stringb1.reverse();
 System.out.println("Reversed String:"+stringb1);
 // Replace method
 stringb1.replace(0, 5, "Hi");
 System.out.println("After replace:"+stringb1);
 // Set length method
 stringb1.setLength(7);
 System.out.println("String with modified length:"+stringb1);
 // Capacity method
 int capacity = stringb1.capacity();
 // Outputting the result
 System.out.println("Modified StringBuffer: " + stringb1);
 System.out.println("Capacity of StringBuffer: " + capacity);
 }
}
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