How to use replace(CharacterSequence, CharacterSequence) in String class

Need simple java program using the following
how to use replace(CharacterSequence, CharacterSequence) in String class
Kindly help

From http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html#replace(java.lang.CharSequence,%20java.lang.CharSequence)
replace
public String replace(CharSequence target,
CharSequence replacement)Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence. The replacement proceeds from the beginning of the string to the end, for example, replacing "aa" with "b" in the string "aaa" will result in "ba" rather than "ab".
Parameters:
target - The sequence of char values to be replaced
replacement - The replacement sequence of char values
Returns:
The resulting string
Throws:
NullPointerException - if target or replacement is null.
Since:
1.5

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