Function & Argument Type(s)
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Description
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Examples
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int
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codePointAt(int index)
Returns the character (Unicode code point) at the specified index.
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>> a = "abcedefghi"
"abcedefghi"
>> b = a.codePointAt(2)
99
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int
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codePointBefore(int index)
Returns the character (Unicode code point) before the specified index.
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>> a = "abcedefghi"
"abcedefghi"
>> b = a.codePointBefore(2)
98
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int
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codePointCount(int beginIndex, int endIndex)
Returns the number of Unicode code points in the specified text range of this String.
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>> a = "abcedefghi"
"abcedefghi"
>> b = a.codePointCount(2,4)
2
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int
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compareToIgnoreCase(String str)
Compares two strings lexicographically, ignoring case differences.
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>> a = "abcedefghi"
"abcedefghi"
>> c = "asdf"
"asdf"
>> b = a.compareToIgnoreCase(c)
-17
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String
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concat(String str)
Concatenates the specified string to the end of this string.
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>> a = "abcedefghi"
"abcedefghi"
>> c = "xtz"
"xtz"
>> b = a.concat(c)
"abcedefghixtz"
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boolean
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contains(CharSequence s)
Returns true if and only if this string contains the specified sequence of char values.
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>> a = "abcedefghi"
"abcedefghi"
>> b = a.contains(a)
true
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boolean
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contentEquals(CharSequence cs)
Compares this string to the specified CharSequence.
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>> a = "abcdefghi"
"abcdefghi"
>> b = a.contentEquals(a)
true
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boolean
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contentEquals(StringBuffer sb)
Compares this string to the specified StringBuffer.
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>> a = "abcdefghi"
"abcdefghi"
>> b = a.contentEquals(a)
true
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boolean
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endsWith(String suffix)
Tests if this string ends with the specified suffix.
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>> a = "abcdgefhi"
"abcdgefhi"
>> b = a.endsWith("c")
false
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boolean
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equalsIgnoreCase(String anotherString)
Compares this String to another String, ignoring case considerations.
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>> a = "abcdgefhi"
"abcdgefhi"
>> b = a.equalsIgnoreCase("b")
false
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int
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hashCode()
Returns a hash code for this string.
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>> a = "abcdgefhi"
"abcdgefhi"
>> b = a.hashCode()
396996423
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int
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indexOf(String str)
Returns the index within this string of the first occurrence of the specified substring.
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>> a = "abcdgefhi"
"abcdgefhi"
>> c = a.indexOf("c")
2
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int
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indexOf(String str, int fromIndex)
Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
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>> a = "abcdgefhi"
"abcdgefhi"
>> c = a.indexOf("c",2)
2
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String
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intern()
Returns a canonical representation for the string object.
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>> a = "abcdgefhi"
"abcdgefhi"
>> d = a.intern()
"abcdgefhi"
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boolean
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isEmpty()
Returns true if, and only if, length() is 0.
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>> a = "abcdefghi"
"abcdefghi"
>> b = a.isEmpty()
false
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int
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lastIndexOf(String str)
Returns the index within this string of the rightmost occurrence of the specified substring.
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>> a = "abcdefghi"
"abcdefghi"
>> c = a.lastIndexOf("b")
1
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int
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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.
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>> a = "abcdefghi"
"abcdefghi"
>> c = a.lastIndexOf("b",2)
1
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int
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length()
Returns the length of this string.
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>> a = "abcdefghi"
"abcdefghi"
>> c = a.length()
9
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boolean
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matches(String regex)
Tells whether or not this string matches the given string.
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>> a = "abcdefghi"
"abcdefghi"
>> d=a.matches("a")
false
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int
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offsetByCodePoints(int index, int codePointOffset)
Returns the index within this String that is offset from the given index by codePointOffset code points.
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>> a = "abcdefghi"
"abcdefghi"
>> e = a.offsetByCodePoints(1,1)
2
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boolean
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regionMatches(boolean ignoreCase, int toffset, String other, int ooffset, int len)
Tests if two string regions are equal.
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>> a = "abcdefghi"
"abcdefghi"
>> f = a.regionMatches(true,0,"abc",1,2)
false
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boolean
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regionMatches(int toffset, String other, int ooffset, int len)
Tests if two string regions are equal.
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>> a = "abcdefghi"
"abcdefghi"
>> f = a.regionMatches(0,"abc",1,2)
false
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String
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replaceAll(String regex, String replacement)
Replaces each substring of this string that matches the given regular expression with the given replacement.
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>> a = "abcdefghi"
"abcdefghi"
>> f = a.replaceAll("a+b","c")
"ccdefghi"
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String
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replaceFirst(String regex, String replacement)
Replaces the first substring of this string that matches the given regular expression with the given replacement.
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>> a = "abcdefghi"
"abcdefghi"
>> f = a.replaceFirst("a+b","c")
"ccdefghi"
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String[]
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split(String regex)
Splits this string around matches of the given regular expression.
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>> a = "abcdefghi"
"abcdefghi"
>> f = a.split("a+b")
{"", "cdefghi"}
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String[]
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split(String regex, int limit)
Splits this string around matches of the given regular expression.
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>> a = "abcdefghi"
"abcdefghi"
>> f = a.split("a+b",4)
{"", "cdefghi"}
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boolean
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startsWith(String prefix)
Tests if this string starts with the specified prefix.
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>> a = "abcdefghi"
"abcdefghi"
>> g = a.startsWith("a")
true
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boolean
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startsWith(String prefix, int toffset)
Tests if the substring of this string beginning at the specified index starts with the specified prefix.
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>> a = "abcdefghi"
"abcdefghi"
>> g = a.startsWith("a",2)
false
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String
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substring(int beginIndex)
Returns a new string that is a substring of this string.
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>> a = "abcdefghi"
"abcdefghi"
>> g = a.substring(2)
"cdefghi"
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String
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substring(int beginIndex, int endIndex)
Returns a new string that is a substring of this string.
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>> a = "abcdefghi"
"abcdefghi"
>> g = a.substring(2,4)
"cd"
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String
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toLowerCase()
Converts all of the characters in this String to lower case using the rules of the default locale.
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>> a = "abcdefghi"
"abcdefghi"
>> g = a.toLowerCase()
"abcdefghi"
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String
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toString()
This object (which is already a string!) is itself returned.
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>> a = "abcdefghi"
"abcdefghi"
>> g = a.toString()
""abcdefghi""
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String
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toUpperCase()
Converts all of the characters in this String to upper case using the rules of the default locale.
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>> a = "abcdefghi"
"abcdefghi"
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String
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trim()
Returns a copy of the string, with leading and trailing whitespace omitted.
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>> a = " abcdefghi "
" abcdefghi "
>> g = a.trim()
"abcdefghi"
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