Java String Manipulation

  • The Java platform gives the String class to create and manage strings.
  • Strings are a series of characters.
  • Java String class gives a variety of strategies to perform operations on string such as compare(), concat(), equals(), split(), length(), replace(), compareTo(), intern(), substring() and many others.
  • String is an immutable item this means that it is a constant and might can not be modified as soon as it’s been created.

 

String Declaration:

Example:

Output:

String Methods Explanation:

 

  • int length(): Returns the number of characters in the String.
  • Char charAt(int i): Returns the character at ith index.
  • String substring (int i): go back the substring from the ith index person to cease.
  • String substring (int i, int j): Returns the substring from i to j-1 index.
  • String concat( String str): Concatenates precise string to the stop of this string.
  • int indexOf (String s): Returns the index inside the string of the first occurrence of the desired string.
  • int indexOf (String s, int i): Returns the index inside the string of the first prevalence of the specified string, starting at the required index.
  • boolean equals( item otherObj): Compares this string to the required object.
  • boolean equalsIgnoreCase (String anotherString): Compares string to every other string, ignoring case concerns.
  • int compareTo( String anotherString): Compares string lexicographically.
  • int compareToIgnoreCase( String anotherString): Compares string lexicographically, ignoring case considerations.
  • String toLowerCase(): Converts all of the characters within the String to decrease case.
  • String toUpperCase(): Converts all of the characters in the String to upper case.
  • String trim(): Returns the reproduction of the String, by disposing of whitespaces at each ends. It does no longer affectwhitespaces inside the center.
  • String replace (char oldChar, char newChar): Returns new string by replacing all occurrences of oldChar with newChar.

 

Example:

Output:

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