Java String substring()

Substring is a part of the String. Java String substring() method returns a new string object from a given String.

Syntax

 
public String substring(int beginIndex)

String str = "Java String Tutorial";

String newStr = str.substring(5);

The above code returns "String Tutorial". That means the substring function extract the new string from 5th character (start index 5 ).

Example

 
class TestClass{
  public static void main (String[] args){
    String str = "Java String Tutorial";
    String newStr = str.substring(5);
    System.out.println(newStr);
  }
}

Output

 
String Tutorial

Syntax

 
substring(int beginIndex, int endIndex)

The above method creates a new String object containing the contents of the existing String between two indices.

 
String str = "Java String Tutorial";
String newStr = str.substring(5,11);

The above code returns "String", that means it extract the string from the 5th character to 11th character.

Example

 
class TestClass{
  public static void main (String[] args){
    String str = "Java String Tutorial";
    String newStr = str.substring(5,11);
    System.out.println(newStr);
  }
}

Output

 
String

How to extract first 4 character from a string?

 
class TestClass{
  public static void main (String[] args){
    String str = "Java String Tutorial";
    String newStr = str.substring(0,4);
    System.out.println(newStr);
  }
}

Output

 
Java

How to extract last 8 characters from a String?

 
class TestClass{
  public static void main (String[] args){
    String str = "Java String Tutorial";
    String newStr = str.substring((str.length()-8),str.length());
    System.out.println(newStr);
  }
}

Output

 
Tutorial

How to print one char on each line?

 
class TestClass{
  public static void main (String[] args){
    String str = "Java String Tutorial";
    for(int i =0;i<str.length();i++){
      System.out.println(str.substring(i,i+1));
    }
  }
}

Output

 
J
a
v
a
S
t
r
i
n
g
T
u
t
o
r
i
a
l

Next : Java String concat() Method