indexOf

int indexOf(int ch)

Returns the index within this string of the first occurrence of the specified character.

int indexOf(int ch, int fromIndex)

Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.

int indexOf(String str)

Returns the index within this string of the first occurrence of the specified substring.

int indexOf(String str, int fromIndex)

Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.

public class Main {
  public static void main(String[] argv) {
    String str = "Java2s.com";
    String str2 = ".com";
    System.out.println(str.indexOf(str2));

  }
}

The output:

6

1. String type and Literals
2. String Concatenation
3. String.CASE_INSENSITIVE_ORDER
4. String Constructor
5. charAt(int index):Get a single char by index
6. String: compareTo(String stringValue)
7. concat(String str)
8. equals():Compare two string value for equality
9. equals( ) vs ==
10. contains(CharSequence s)
11. copyValueOf(char[] data)
12. endsWith(String suffix)
13. format():Format a string
14. getBytes():Get byte array from string
15. getChars()
16. indexOf
17. intern a string
18. isEmpty:if string is empty
19. lastIndexOf()
20. length() Returns the length of this string
21. startsWith( )
22. toLowerCase() and toUpperCase(): convert string case with locale
23. substring:Get sub string from a string
24. toCharArray():Get char array from string
25. toString( )
26. trim()
27. valueOf():Convert boolean, char, double, float,int,long,object to String