Using the substring method in Java

The substring method in the String class functions to return a part of the string in the range of the string designation index.

public String substring(int startIndex)  
public String substring(int startIndex, int endIndex)  
startIndex : Required. Starting index number (int type), starting from 0
endIndex : Optional. End index number (int type), if omitted, return to the end of the string.

🌱Sample

public class Test {
    public static void main(String[] args) {
        String str = "code-journey.com";
        System.out.println(hz.substring(0,4));  // result: code
        System.out.println(hz.substring(5));    // result: : journey.com
        System.out.println(hz.substring(0));    // result: : code-journey.com
        System.out.println(hz.substring(5,20)); // result : (fail) StringIndexOutOfBoundsException
    }
}

If the StringIndexOutOfBoundsException error occurs.

1. If startIndex is negative number.
2. If the endindex is greater than the string length.
3. If startIndex is greater than endIndex.