String in-built basic and important functions to remember .

charAt(int index): Returns the character at the specified index.
```
 javaCopy codechar charAtIndex = myString.charAt(3);
```

length(): Returns the length of the string.

 javaCopy codeint strLength = myString.length();

substring(int beginIndex): Returns a substring starting from the specified index.
```
 javaCopy codeString subString = myString.substring(2);
```
substring(int beginIndex, int endIndex): Returns a substring within the specified range.
```
 javaCopy codeString subString = myString.substring(2, 5);
```

toLowerCase(): Converts all characters in the string to lowercase.

 javaCopy codeString lowerCaseString = myString.toLowerCase();

toUpperCase(): Converts all characters in the string to uppercase.

 javaCopy codeString upperCaseString = myString.toUpperCase();

trim(): Removes leading and trailing whitespaces from the string.
```
 javaCopy codeString trimmedString = myString.trim();
```
equals(Object another): Compares the content of two strings for equality.
```
 javaCopy codeboolean isEqual = myString.equals(anotherString);
```
equalsIgnoreCase(String another): Compares two strings for equality, ignoring case differences.
```
 javaCopy codeboolean isEqualIgnoreCase = myString.equalsIgnoreCase(anotherString);
```
startsWith(String prefix): Checks if the string starts with the specified prefix.
```
javaCopy codeboolean startsWithPrefix = myString.startsWith("abc");
```
endsWith(String suffix): Checks if the string ends with the specified suffix.
```
javaCopy codeboolean endsWithSuffix = myString.endsWith("xyz");
```
indexOf(int ch): Returns the index of the first occurrence of the specified character.
```
javaCopy codeint indexOfChar = myString.indexOf('a');
```
lastIndexOf(int ch): Returns the index of the last occurrence of the specified character.
```
javaCopy codeint lastIndexOfChar = myString.lastIndexOf('a');
```
contains(CharSequence sequence): Checks if the string contains the specified sequence of characters.
```
javaCopy codeboolean containsSequence = myString.contains("abc");
```
replace(char oldChar, char newChar): Replaces all occurrences of a specified character with another character.
```
javaCopy codeString replacedString = myString.replace('a', 'b');
```

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