String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class.
Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example:
String str = "abc";
is equivalent to:
char data[] = {'a', 'b', 'c'};
String str = new String(data);
Here are some more examples of how strings can be used:
System.out.println("abc");
String cde = "cde";
System.out.println("abc" + cde);
String c = "abc".substring(2,3);
String d = cde.substring(1, 2);
The class String includes methods for examining individual characters of the sequence, for comparing strings, for searching strings, for extracting substrings, and for creating a copy of a string with all characters translated to uppercase or to lowercase.
The Java language provides special support for the string concatentation operator ( + ), and for conversion of other objects to strings. String concatenation is implemented through the StringBuffer class and its append method. String conversions are implemented through the method toString, defined by Object and inherited by all classes in Java. For additional information on string concatenation and conversion, see Gosling, Joy, and Steele, The Java Language Specification.
package java.lang;
import java.util.Hashtable;
import java.util.Locale;
import sun.io.ByteToCharConverter;
import sun.io.CharToByteConverter;
import java.io.CharConversionException;
import java.io.UnsupportedEncodingException;
(>JDK1.0)public final
class String implements java.io.Serializable {
// Constructeurs publiques
(>JDK1.0) public String();
// obsolète
(>JDK1.0) public String(byte ascii[], int hibyte);
// obsolète
(>JDK1.0) public String(byte ascii[], int hibyte, int offset, int count);
(>JDK1.1) public String(byte bytes[]);
(>JDK1.1) public String(byte bytes[], String enc)
throws UnsupportedEncodingException;
(>JDK1.1) public String(byte bytes[], int offset, int length);
(>JDK1.1) public String(byte bytes[], int offset, int length, String enc)
throws UnsupportedEncodingException;
(>JDK1.0) public String(char value[]);
(>JDK1.0) public String(char value[], int offset, int count);
(>JDK1.0) public String(String value);
(>JDK1.0) public String(StringBuffer buffer);
// Méthodes de classe publiques
(>JDK1.0) public static String copyValueOf(char data[]);
(>JDK1.0) public static String copyValueOf(char data[], int offset, int count);
(>JDK1.0) public static String valueOf(boolean b);
(>JDK1.0) public static String valueOf(char c);
(>JDK1.0) public static String valueOf(char data[]);
(>JDK1.0) public static String valueOf(char data[], int offset, int count);
(>JDK1.0) public static String valueOf(double d);
(>JDK1.0) public static String valueOf(float f);
(>JDK1.0) public static String valueOf(int i);
(>JDK1.0) public static String valueOf(long l);
(>JDK1.0) public static String valueOf(Object obj);
// Méthodes d'instance publiques
(>JDK1.0) public char charAt(int index);
(>JDK1.0) public int compareTo(String anotherString);
(>JDK1.0) public String concat(String str);
(>JDK1.0) public boolean endsWith(String suffix);
(>JDK1.0) public boolean equals(Object anObject);
(>JDK1.0) public boolean equalsIgnoreCase(String anotherString);
(>JDK1.1) public byte[] getBytes();
// obsolète
(>JDK1.0) public void getBytes(int srcBegin, int srcEnd, byte dst[], int dstBegin);
(>JDK1.1) public byte[] getBytes(String enc)
throws UnsupportedEncodingException;
(>JDK1.0) public void getChars(int srcBegin, int srcEnd, char dst[], int dstBegin);
(>JDK1.0) public int hashCode();
(>JDK1.0) public int indexOf(int ch);
(>JDK1.0) public int indexOf(int ch, int fromIndex);
(>JDK1.0) public int indexOf(String str);
(>JDK1.0) public int indexOf(String str, int fromIndex);
(>JDK1.0) public native String intern();
(>JDK1.0) public int lastIndexOf(int ch);
(>JDK1.0) public int lastIndexOf(int ch, int fromIndex);
(>JDK1.0) public int lastIndexOf(String str);
(>JDK1.0) public int lastIndexOf(String str, int fromIndex);
(>JDK1.0) public int length();
(>JDK1.0) public boolean regionMatches(boolean ignoreCase,
int toffset,
String other, int ooffset, int len);
(>JDK1.0) public boolean regionMatches(int toffset, String other, int ooffset, int len);
(>JDK1.0) public String replace(char oldChar, char newChar);
(>JDK1.0) public boolean startsWith(String prefix);
(>JDK1.0) public boolean startsWith(String prefix, int toffset);
(>JDK1.0) public String substring(int beginIndex);
(>JDK1.0) public String substring(int beginIndex, int endIndex);
(>JDK1.0) public char[] toCharArray();
(>JDK1.1) public String toLowerCase(Locale locale);
(>JDK1.0) public String toLowerCase();
(>JDK1.0) public String toString();
(>JDK1.1) public String toUpperCase(Locale locale);
(>JDK1.0) public String toUpperCase();
(>JDK1.0) public String trim();
}
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| Christophe Merlet redfox@redfoxcenter.org | ©Tous droits réservés
11 septembre 1998 |