Java String substring() method - substring In Java

Strings > Modifying a String >
Siva Nookala - 01 Apr 2016

The substring method can be used to extract some characters from the String. These substrings can be obtained using indices.

This method comes in two forms:
public String substring(int beginIndex)

Returns a new string that is a substring of this string. The substring begins with the character at the beginIndex and extends to the end of this string.
public String substring(int beginIndex, int endIndex)

This returns a new string that is a substring of this string. The substring begins at the specified beginIndex and extends to the character at index (endIndex - 1).

Get Substring from String

CODE

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class Substring
{
    public static void main(String arg[])
    {
        String s1 = "Welcome to Merit Campus";
        String s2 = s1.substring(11);  // LINE A
        System.out.println(s2);
        String s3 = s1.substring(11, 17);  // LINE B
        System.out.println(s3);    
    }
}

OUTPUT

Merit Campus
Merit

DESCRIPTION

The program shows the two variants of substring method. In LINE A, a new string containing characters from index 11 till the end of s1 is returned. In LINE B, a string containing characters from index 11 to 16 i.e. (17 - 1) is returned.

THINGS TO TRY

Place the below shown code at LINE A and check the output.

String s2 = s1.substring(24);
An IndexOutOfBoundsException is thrown, since the index value is greater than the string length.

In LINE B, give same value for both beginIndex and endIndex (An empty string is returned).

Place the below code at LINE B and check the output.

String s2 = s1.substring(11, 10);
IndexOutOfBoundsException is thrown. Since the endIndex is lesser than the beginIndex.

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