Untitled Quiz

A sequence of characters enclosed in double quotes. Strings are immutable, meaning they cannot be changed after creation. They are used to represent text data, like names, addresses, or messages.

A special character that represents another character. Examples include \ for backslash, " for double quote, and \n for newline.

The process of combining two strings into a single string. In Java, the + operator is used for concatenation.

A method used to transform a string into a new string, but the original string remains unchanged.

An object of the String class that represents a sequence of characters. Strings are immutable, meaning they cannot be changed after creation.

The Java class that defines how String objects are created and manipulated. It provides methods for working with string data.

Java's built-in package that contains essential classes, including the String class. Classes in this package are automatically available for use.

A built-in operator in Java used to add strings together or to concatenate a string and a variable.

A sequence of characters that represents text. In Java, strings are immutable.

Comparing strings with the == operator checks if they are stored in the same location in memory. The equals() method checks if their contents are equal.

An empty string has no characters (length=0), distinct from a null string, which hasn't been assigned a value.

String Constructors are used to create new String objects. The no-args constructor creates an empty string, and other constructors convert arrays to strings.

String methods in Java don't modify the original String, instead they return a new String with changes applied.

A sequence of characters that is immutable, meaning it cannot be changed directly once created.

Strings created using string literals ("...") are only allocated new memory spaces if their content is different from other Strings in memory. If the content is the same, a reference to the existing memory space is used.

The == operator compares the memory addresses of two String objects. If the addresses are the same, the result is true. If the addresses are different, even if the content is identical, the result is false.

The equals() method compares the content of two String objects. If the content is identical, the result is true. If the content is different, the result is false.

When you modify a String in a method, you create a new String object with the modified content in a different memory location. The original String remains unchanged.

When you pass a String to a method, you are actually passing a reference to its memory location. Modifying the String within the method does not change the original String object.

Creating a new String object for every small change can consume memory and potentially be inefficient in performance. Consider alternatives like StringBuilder when many modifications are expected.

A sequence of characters enclosed in double quotes. Strings are immutable, meaning they cannot be changed after creation. They are used to represent text data, like names, addresses, or messages.

The length() method returns the number of characters in a string.

The charAt(index) method returns the character at the specified index. Character positions in strings start at 0.

The substring(start, end) method extracts a portion of a string starting at the specified start index (inclusive) and ending at the specified end index (exclusive).

The substring(start) method extracts a portion of a string starting at the specified start index (inclusive) and continuing to the end of the string.

The indexOf(character) method returns the index of the first occurrence of the specified character in the string, or -1 if the character is not found.

The concat(string) method appends a specified string to the end of the original string.

The lastIndexOf(character) method returns the index of the last occurrence of the specified character in the string, or -1 if the character is not found.

The equals() method is used to compare the content of two strings, while the == operator checks if they refer to the same object in memory. To test if two strings have the same characters in the same order, use equals() or compareTo(), not ==.

Strings are immutable, meaning their content cannot be changed after creation. When performing operations like concatenation or substring extraction, new String objects are created.

The indexOf() method helps find the first occurrence of a specific character or substring within a string. It returns the index of the first occurrence, or -1 if not found. You can overload the method to specify a starting position.

Converting integers to strings is straightforward using the Integer.toString() method. To convert a string to an integer, use the Integer.parseInt() method of the Integer class.

Substrings do not include the character at the end index. The substring(beginIndex, endIndex) method extracts a new string from the specified range, excluding the character at endIndex.

Strings in Java are immutable, meaning they cannot be changed after they are created. Any modification to a string results in a new string being created in memory, while the original string remains untouched.

The compareTo() method compares two strings lexicographically (based on the Unicode values of their characters). The method returns a negative value if the first string comes before the second, a positive value if the first string comes after the second, and zero if the strings are equal.

When you use equals() to compare strings you are checking the content of the string. If the content of two strings is the same then the method returns true otherwise it returns false.

The length() method returns the number of characters in a string.

You can declare an empty string by assigning an empty string literal to a variable. For example, String myString = "";