Strings API Flashcards
What does charAt(i) do?
charAt(int index)
Returns the char value at the specified index.
What do codePointAt(i), codePointBefore(i), codePointCount(i, j) do?
codePointAt(int index)
Returns the character (Unicode code point) at the specified index.
codePointBefore(int index)
Returns the character (Unicode code point) before the specified index.
int codePointCount(int beginIndex, int endIndex) Returns the number of Unicode code points in the specified text range of this String.
What do compareTo(s), compareToIgnoreCase(s) do?
int compareTo(String anotherString) Compares two strings lexicographically.
int compareToIgnoreCase(String str) Compares two strings lexicographically, ignoring case differences.
What does concat(s) do?
String concat(String str) Concatenates the specified string to the end of this string.
What does contains(cs) do?
boolean contains(CharSequence s) Returns true if and only if this string contains the specified sequence of char values.
What do copyValueOf(ca), copyValueOf(ca, i, j) do?
static String copyValueOf(char[] data)
Returns a String that represents the character sequence in the array specified.
static String copyValueOf(char[] data, int offset, int count)
Returns a String that represents the character sequence in the array specified.
What does endsWith(s) do?
boolean endsWith(String suffix) Tests if this string ends with the specified suffix.
What do equals(o), equalsIgnoreCase(s), contentEquals(cs), contentEquals(sb) do?
boolean equals(Object anObject) Compares this string to the specified object.
boolean equalsIgnoreCase(String anotherString) Compares this String to another String, ignoring case considerations.
boolean contentEquals(CharSequence cs) Compares this string to the specified CharSequence.
boolean contentEquals(StringBuffer sb) Compares this string to the specified StringBuffer.
What do format(l, sf, oa), format(sf, oa) do?
static String format(Locale l, String format, Object… args)
Returns a formatted string using the specified locale, format string, and arguments.
static String format(String format, Object… args)
Returns a formatted string using the specified format string and arguments.
What do getBytes(), getBytes(charset), getBytes(s) do?
byte[] getBytes()
Encodes this String into a sequence of bytes using the platform’s default charset, storing the result into a new byte array.
byte[] getBytes(Charset charset)
Encodes this String into a sequence of bytes using the given charset, storing the result into a new byte array.
byte[] getBytes(String charsetName)
Encodes this String into a sequence of bytes using the named charset, storing the result into a new byte array.
void getBytes(int srcBegin, int srcEnd, byte[] dst, int dstBegin) Deprecated. This method does not properly convert characters into bytes. As of JDK 1.1, the preferred way to do this is via the getBytes() method, which uses the platform's default charset.
What does hashCode() do?
int hashCode() Returns a hash code for this string.
What do indexOf(c), indexOf(c,j), indexOf(s), indexOf(s, i) do?
int indexOf(int ch) Returns the index within this string of the first occurrence of the specified character.
int indexOf(int ch, int fromIndex) Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.
int indexOf(String str) Returns the index within this string of the first occurrence of the specified substring.
int indexOf(String str, int fromIndex) Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
What does intern() do?
String intern() Returns a canonical representation for the string object.
What does isEmpty() do?
boolean isEmpty() Returns true if, and only if, length() is 0.
What do lastIndexOf(c), lastIndexOf(c,i), lastIndexOf(s), lastIndexOf(s, i) do?
int lastIndexOf(int ch) Returns the index within this string of the last occurrence of the specified character.
int lastIndexOf(int ch, int fromIndex) Returns the index within this string of the last occurrence of the specified character, searching backward starting at the specified index.
int lastIndexOf(String str) Returns the index within this string of the last occurrence of the specified substring.
int lastIndexOf(String str, int fromIndex) Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index.