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7174936: several String methods claim to always create new String

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Reviewed-by: dholmes, bchristi, alanb, lancea
This commit is contained in:
Stuart Marks 2013-11-21 16:02:16 -08:00
parent a353eaac39
commit 99fc6852a3
1 changed files with 32 additions and 31 deletions
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63
jdk/src/share/classes/java/lang/String.java
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@ -123,7 +123,7 @@ public final class String
* Class String is special cased within the Serialization Stream Protocol.
*
* A String instance is written into an ObjectOutputStream according to
* <a href="{@docroot}../platform/serialization/spec/output.html">
* <a href="{@docRoot}/../platform/serialization/spec/output.html">
* Object Serialization Specification, Section 6.2, "Stream Elements"</a>
*/
private static final ObjectStreamField[] serialPersistentFields =
@ -1893,7 +1893,7 @@ public final class String
}
/**
* Returns a new string that is a substring of this string. The
* Returns a string that is a substring of this string. The
* substring begins with the character at the specified index and
* extends to the end of this string. <p>
* Examples:
@ -1921,7 +1921,7 @@ public final class String
}
/**
* Returns a new string that is a substring of this string. The
* Returns a string that is a substring of this string. The
* substring begins at the specified {@code beginIndex} and
* extends to the character at index {@code endIndex - 1}.
* Thus the length of the substring is {@code endIndex-beginIndex}.
@ -1970,6 +1970,7 @@ public final class String
* <blockquote><pre>
* str.substring(begin,&nbsp;end)</pre></blockquote>
*
* @apiNote
* This method is defined so that the {@code String} class can implement
* the {@link CharSequence} interface.
*
@ -1993,8 +1994,8 @@ public final class String
* Concatenates the specified string to the end of this string.
* <p>
* If the length of the argument string is {@code 0}, then this
* {@code String} object is returned. Otherwise, a new
* {@code String} object is created, representing a character
* {@code String} object is returned. Otherwise, a
* {@code String} object is returned that represents a character
* sequence that is the concatenation of the character sequence
* represented by this {@code String} object and the character
* sequence represented by the argument string.<p>
@ -2021,13 +2022,13 @@ public final class String
}
/**
* Returns a new string resulting from replacing all occurrences of
* Returns a string resulting from replacing all occurrences of
* {@code oldChar} in this string with {@code newChar}.
* <p>
* If the character {@code oldChar} does not occur in the
* character sequence represented by this {@code String} object,
* then a reference to this {@code String} object is returned.
* Otherwise, a new {@code String} object is created that
* Otherwise, a {@code String} object is returned that
* represents a character sequence identical to the character sequence
* represented by this {@code String} object, except that every
* occurrence of {@code oldChar} is replaced by an occurrence
@ -2818,8 +2819,8 @@ public final class String
}
/**
* Returns a copy of the string, with leading and trailing whitespace
* omitted.
* Returns a string whose value is this string, with any leading and trailing
* whitespace removed.
* <p>
* If this {@code String} object represents an empty character
* sequence, or the first and last characters of character sequence
@ -2828,15 +2829,15 @@ public final class String
* reference to this {@code String} object is returned.
* <p>
* Otherwise, if there is no character with a code greater than
* {@code '\u005Cu0020'} in the string, then a new
* {@code String} object representing an empty string is created
* and returned.
* {@code '\u005Cu0020'} in the string, then a
* {@code String} object representing an empty string is
* returned.
* <p>
* Otherwise, let <i>k</i> be the index of the first character in the
* string whose code is greater than {@code '\u005Cu0020'}, and let
* <i>m</i> be the index of the last character in the string whose code
* is greater than {@code '\u005Cu0020'}. A new {@code String}
* object is created, representing the substring of this string that
* is greater than {@code '\u005Cu0020'}. A {@code String}
* object is returned, representing the substring of this string that
* begins with the character at index <i>k</i> and ends with the
* character at index <i>m</i>-that is, the result of
* {@code this.substring(k, m + 1)}.
@ -2844,7 +2845,7 @@ public final class String
* This method may be used to trim whitespace (as defined above) from
* the beginning and end of a string.
*
* @return A copy of this string with leading and trailing white
* @return A string whose value is this string, with any leading and trailing white
* space removed, or this string if it has no leading or
* trailing white space.
*/
@ -2981,12 +2982,12 @@ public final class String
/**
* Returns the string representation of the {@code char} array
* argument. The contents of the character array are copied; subsequent
* modification of the character array does not affect the newly
* created string.
* modification of the character array does not affect the returned
* string.
*
* @param data a {@code char} array.
* @return a newly allocated string representing the same sequence of
* characters contained in the character array argument.
* @param data the character array.
* @return a {@code String} that contains the characters of the
* character array.
*/
public static String valueOf(char data[]) {
return new String(data);
@ -3000,14 +3001,13 @@ public final class String
* character of the subarray. The {@code count} argument
* specifies the length of the subarray. The contents of the subarray
* are copied; subsequent modification of the character array does not
* affect the newly created string.
* affect the returned string.
*
* @param data the character array.
* @param offset the initial offset into the value of the
* {@code String}.
* @param count the length of the value of the {@code String}.
* @return a string representing the sequence of characters contained
* in the subarray of the character array argument.
* @param offset initial offset of the subarray.
* @param count length of the subarray.
* @return a {@code String} that contains the characters of the
* specified subarray of the character array.
* @exception IndexOutOfBoundsException if {@code offset} is
* negative, or {@code count} is negative, or
* {@code offset+count} is larger than
@ -3018,23 +3018,24 @@ public final class String
}
/**
* Returns a String that represents the character sequence in the
* array specified.
* Equivalent to {@link #valueOf(char[], int, int)}.
*
* @param data the character array.
* @param offset initial offset of the subarray.
* @param count length of the subarray.
* @return a {@code String} that contains the characters of the
* specified subarray of the character array.
* @exception IndexOutOfBoundsException if {@code offset} is
* negative, or {@code count} is negative, or
* {@code offset+count} is larger than
* {@code data.length}.
*/
public static String copyValueOf(char data[], int offset, int count) {
// All public String constructors now copy the data.
return new String(data, offset, count);
}
/**
* Returns a String that represents the character sequence in the
* array specified.
* Equivalent to {@link #valueOf(char[])}.
*
* @param data the character array.
* @return a {@code String} that contains the characters of the