Java String substring() Method Example

There are two forms of String.substring() methods.
  • String substring(int beginIndex) -  Returns a string that is a substring of this string. 
  • String substring(int beginIndex, int endIndex)  - Returns a string that is a substring of this string.
These methods throw IndexOutOfBoundsException- if beginIndex is negative or larger than the length of this String object.

Java String substring() Method Example

This is a complete example to demonstrate the usage of both substring()  methods.
public class SubStringExample {
    public static void main(String[] args) {
        String str = "javaguides";
         // substring from start to end
        String subStr = str.substring(0, str.length());
        System.out.println("substring from 0 to length of the string : " + subStr);
        subStr = str.substring(4);
        System.out.println("Sub string starts from index 4 : " + subStr);
         // Remember index starts from 0
        System.out.println(str.substring(1));
        System.out.println("unhappy".substring(2));
        System.out.println("Harbison".substring(3));
        System.out.println("emptiness".substring(8));
    }
}
Output:
substring from 0 to length of the string: javaguides Sub string starts from index 4: guides avaguides happy bison s

Reference

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