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The Java substring() method extracts a part of the string (substring) and returns it.
Example
class Main {
public static void main(String[] args) {
String str1 = "java is fun";
// extract substring from index 0 to 3
System.out.println(str1.substring(0, 4));
}
}
// Output: java
substring() Syntax
string.substring(int startIndex, int endIndex)
substring() Parameters
The substring() method can take a maximum of two arguments.
- startIndex - the beginning index
- endIndex (optional) - the ending index
substring() Return Value
The substring() method returns a substring from the given string.
- The substring begins with the character at the startIndex and extends to the character at index
endIndex - 1 - If the endIndex is not passed, the substring begins with the character at the specified index and extends to the end of the string
[Working of Java String substring() method]
Working of Java String substring() method
![[Working of Java String substring() method]](https://programiz.com/sites/tutorial2program/files/java-string-substring.png){kind=link}
Note: You will get an error if
- startIndex/endIndex is negative or greater than string's length
- startIndex is greater than endIndex
Example 1: Java substring() With Only Start Index
class Main {
public static void main(String[] args) {
String str1 = "program";
// 1st character to the last character
System.out.println(str1.substring(0)); // program
// 4th character to the last character
System.out.println(str1.substring(3)); // gram
}
}
Example 2: Java substring() With Start and End Index
class Main {
public static void main(String[] args) {
String str1 = "program";
// 1st to the 7th character
System.out.println(str1.substring(0, 7)); // program
// 1st to the 5th character
System.out.println(str1.substring(0, 5)); // progr
// 4th to the 5th character
System.out.println(str1.substring(3, 5)); // gr
}
}
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