-
char charAt(int index)
returns the character at the specified location.
-
int compareTo(String other)
returns a negative value if the string comes before other in dictionary order, a positive value if the string comes after other in dictionary order, or 0 if the strings are equal.
-
boolean endsWith(String suffix)
returns true if the string ends with suffix.
-
boolean equals(Object other)
returns true if the string equals other.
-
boolean equalsIgnoreCase(String other)
returns true if the string equals other, except for upper/lowercase distinction.
-
int indexOf(String str)
-
int indexOf(String str, int fromIndex)
return the start of the first substring equal to str, starting at index 0 or at fromIndex.
-
int lastIndexOf(String str)
-
int lastIndexOf(String str, int fromIndex)
return the start of the last substring equal to str, starting at the end of the string or at fromIndex.
-
int length()
returns the length of the string.
-
String replace(char oldChar, char newChar)
returns a new string that is obtained by replacing all characters oldChar in the string with newChar.
-
boolean startsWith(String prefix)
returns true if the string begins with prefix.
-
String substring(int beginIndex)
-
String substring(int beginIndex, int endIndex)
return a new string consisting of all characters from beginIndex until the end of the string or until endIndex (exclusive).
-
String toLowerCase()
returns a new string containing all characters in the original string, with uppercase characters converted to lower case.
-
String toUpperCase()
returns a new string containing all characters in the original string, with lowercase characters converted to upper case.
-
String trim()
returns a new string by eliminating all leading and trailing spaces in the original string.
字符串與基本數(shù)據(jù)類型的轉(zhuǎn)換間的轉(zhuǎn)換必須使用JSP中的對(duì)象函數(shù)
Boolean.getBoolean(String)
Byte.parseByte(String)
Short.parseShort(String)
Integer.parseInt(String)
Long.parseLong(String)
Float.parseDouble(String)
Double.parseDouble(String)
String.valueOF(數(shù)據(jù))
Array
static void arraycopy(Object from, int fromIndex, Object to, int toIndex, int count)
|
Parameters: |
from |
an array of any type (Chapter 5 explains why this is a parameter of type Object) |
| |
fromIndex |
the starting index from which to copy elements |
| |
to |
an array of the same type as from |
| |
toIndex |
the starting index to which to copy elements |
| |
count |
the number of elements to copy |
copies elements from the first array to the second array.
-
static void sort(Xxx[] a)
|
Parameters: |
a |
an array of type int, long, short, char, byte, boolean, float or double |
sorts the array, using a tuned QuickSort algorithm.
-
static int binarySearch(Xxx[] a, Xxx v)
|
Parameters: |
a |
a sorted array of type int, long, short, char, byte, boolean, float or double |
| |
v |
a value of the same type as the elements of a |
uses the BinarySearch algorithm to search for the value v. If it is found, its index is returned. Otherwise, a negative value r is returned; -r - 1 is the spot at which v should be inserted to keep a sorted.
-
static void fill(Xxx[] a, Xxx v)
|
Parameters: |
a |
an array of type int, long, short, char, byte, boolean, float or double |
| |
v |
a value of the same type as the elements of a |
sets all elements of the array to v.
-
static boolean equals(Xxx[] a, Object other)
|
Parameters: |
a |
an array of type int, long, short, char, byte, boolean, float or double |
| |
other |
an object |
returns true if other is an array of the same type, if it has the same length, and if the elements in corresponding indexes match.
eg:
int[] smallPrimes = {2, 3, 5, 7, 11, 13};
int[] luckyNumbers = {1001, 1002, 1003, 1004, 1005, 1006, 1007};
System.arraycopy(smallPrimes, 2, luckyNumbers, 3, 3);
for (int i = 0; i < luckyNumbers.length; i++)
System.out.println(i + ": " + luckyNumbers[i]);
posted on 2005-09-05 13:56
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