Discuss various overloaded constructors of the String class with suitable code examples. Explain the behavior of each

Overloaded Constructors of the String Class in Java

The String class provides several overloaded constructors to create string objects in different ways. Each constructor behaves differently based on the type of argument passed.

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1. String()

• Creates an empty string.

String s = new String();
System.out.println("Empty String: '" + s + "'");

Output:

Empty String: ''

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2. String(String original)

• Creates a new String with the same content as the original string.

String original = "Java";
String copy = new String(original);
System.out.println(copy); // Java

Behavior: Creates a new string object (not the same reference as original).

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3. String(char[] value)

• Creates a string from a character array.

char[] chars = {'H', 'e', 'l', 'l', 'o'};
String s = new String(chars);
System.out.println(s); // Hello

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4. String(char[] value, int offset, int count)

• Creates a string from a subarray of characters.

char[] chars = {'J', 'a', 'v', 'a', 'X'};
String s = new String(chars, 1, 3);
System.out.println(s); // ava

Behavior: Starts at index 1 and takes 3 characters: a, v, a.

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5. String(byte[] bytes)

• Creates a string from a byte array using the platform’s default charset.

byte[] bytes = {65, 66, 67};
String s = new String(bytes);
System.out.println(s); // ABC

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6. String(byte[] bytes, int offset, int length)

• Creates a string from a subarray of bytes.

byte[] bytes = {65, 66, 67, 68};
String s = new String(bytes, 1, 2);
System.out.println(s); // BC

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7. String(StringBuffer buffer)

• Creates a string from a StringBuffer object.

StringBuffer sb = new StringBuffer("Hello");
String s = new String(sb);
System.out.println(s); // Hello

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8. String(StringBuilder builder)

• Creates a string from a StringBuilder object.

StringBuilder sb = new StringBuilder("World");
String s = new String(sb);
System.out.println(s); // World

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Summary Table

Constructor	Purpose
String()	Creates an empty string
String(String original)	Copy constructor
String(char[] value)	From character array
String(char[], int, int)	From part of char array
String(byte[] bytes)	From byte array
String(byte[], int, int)	From part of byte array
String(StringBuffer)	From StringBuffer
String(StringBuilder)	From StringBuilder

Discuss various overloaded constructors of the String class with suitable code examples. Explain the behavior of each.