Unit 2 Java String Concepts

The purpose of the String class in Java is to represent and manipulate sequences of characters.

To handle file input and output in Java.

To create user interfaces in Java.

To store numerical values in Java.

String str = "Hello, World!";

String str = 'Hello, World!';

String str = new String();

String str = new String('Hello, World!');

Count the characters manually.

Apply the 'getLength' function.

Use the 'size' method.

Use the 'length' property or method.

In Java, strings are mutable and can be altered at any time.

String immutability in Java means that once a string is created, it cannot be altered, and any changes result in a new string object.

Strings in Java can be modified directly after creation.

String immutability allows changing the original string without creating a new one.

Use the 'string.uppercase()' function

Use the 'capitalize()' method

Use the 'toLowerCase()' method

Use the 'toUpperCase()' method (Java) or 'upper()' method (Python) to convert a String to uppercase.

Use str1.compareTo(str2) for equality check.

Use str1 == str2 for content equality.

Use str1.equals(str2) for content equality.

Use str1.equalsIgnoreCase(str2) for exact match.

It returns the entire string.

It returns a substring from the start to the specified index.

It removes the specified index from the string.

It returns a substring from the specified index to the end of the string.

You can concatenate two strings using the '&' operator.

Strings can only be concatenated using the StringBuilder class.

You can concatenate two strings in Java using the '+' operator or the String.concat() method.

You must use the String.join() method to concatenate strings.

The total number of characters in the string.

The index of the first occurrence of the character, or -1 if not found.

A boolean indicating if the character exists in the string.

The last occurrence of the character in the string.

Yes, you can modify a String object directly.

No, you cannot modify a String object after it has been created.

String objects can be changed using methods.

Strings are mutable and can be altered after creation.