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Questions and Answers
Which constructor in the String class creates an empty string?
Which constructor in the String class creates an empty string?
- String str = new String(); (correct)
- String str = new String("");
- String str = new String("Empty");
- String str = new String(null);
What is the purpose of the String constructor String(byte[] bytes)?
What is the purpose of the String constructor String(byte[] bytes)?
- To create a new String by decoding the specified array of bytes using the platform's default charset. (correct)
- To create a new String by encoding the specified array of bytes using the platform's default charset.
- To create a new String with the same characters as the specified byte array.
- To create a new String by converting the specified byte array to hexadecimal representation.
Which constructor is used to create a String object with the same sequence of characters as a specified StringBuffer?
Which constructor is used to create a String object with the same sequence of characters as a specified StringBuffer?
- String str = new String(StringBuffer.toString());
- String str = new String(buffer.toString());
- String str = new String(buffer);
- String str = buffer.toString(); (correct)
Which constructor creates an empty string?
Which constructor creates an empty string?
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Which constructor creates a string with the specified content?
Which constructor creates a string with the specified content?
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Which constructor creates a string with the same content as the given StringBuffer object?
Which constructor creates a string with the same content as the given StringBuffer object?
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Study Notes
String Constructors
- The
String()constructor creates an empty string. - The
String(byte[] bytes)constructor is used to create a String object from a byte array, converting the byte array into a string by decoding the bytes using the platform's default charset. - The
String(StringBuffer buffer)constructor creates a String object with the same sequence of characters as a specified StringBuffer. - Multiple constructors can create an empty string, but the
String()constructor is one of them. - The
String(String original)constructor creates a string with the specified content, by copying the characters from the original string. - The
String(StringBuffer buffer)constructor also creates a string with the same content as the given StringBuffer object.
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