String Manipulation

3. ) Replacing characters in String

The replace method of String can be used to replace all occurrences of the specified character with given character.

String replace(char oldChar, int newchar)

4. ) Getting substrings

String class provides substring method to extract specified portion of the given String. This method has been overloaded.

String substring(int startIndex)
String substring(int startIndex, int endIndex)

Note : A new String object containing the substring is created and returned. The original String won’t be affected.

If the index value is not valid, a StringIndexOutOfBoundsException is thrown.

5. ) Conversions

String class provides set of static overloaded valueOf method to convert primitives and object into strings.

static String valueOf(Object obj)
static String valueOf(char[] character)
static String valueOf(boolean b)
static String valueOf(char c)
static String valueOf(int i)
static String valueOf(long l)
static String valueOf(float f)
static String valueOf(double d)