This is an example of how to search a String using the indexOf method of String class. The String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class. Searching a String implies that you should:
- Create a new String.
- Use
indexOf(String str)API method of String. This method returns the index within this string of the first occurrence of the specified substring. - Use
indexOf(String str, int fromIndex)API method of String. This method returns the index within this string of the first occurrence of the specified substring, starting at the specified index. - Use
lastIndexOf(String str)API method of String. This method returns the index within this string of the last occurrence of the specified substring.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
public class SearchStringWithIndexOfMethod {
public static void main(String[] args) {
String s = "Hello Java Code Geeks";
int index = s.indexOf("Hello");
if (index == -1) {
System.out.println("'Hello' not found");
}
else {
System.out.println("Found 'Hello' at " + index);
}
index = s.indexOf("a", 8);
System.out.println("Index of 'a' after index 8 is " + index);
int lastIndex = s.lastIndexOf("e");
System.out.println("Last occurrence of 'e' is at index " + lastIndex);
}
}
Output:
Found 'Hello' at 0
Index of 'a' after index 8 is 9
Last occurrence of 'e' is at index 18
This was an example of how to search a String using the indexOf method of String in Java.
