Java StringBuilder toString() method returns the string representation of the character sequence. As we learned in previous tutorial StringBuilder in Java that a StringBuilder instance represents a character sequence. The toString() method converts this sequence into a String.
Syntax of toString() method:
String str = sb.toString(); //converts sb to a String str Here, sb is an object of StringBuilder class
toString() Description
public string toString(): Returns a String representation of the StringBuilder sequence.
toString() Parameters
- It does not take any parameter.
toString() Return Value
- It returns a string that is equivalent to the char sequence represented by StringBuilder object.
Example 1: Converting int to String using toString()
public class JavaExample {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
int num =101; //int value
sb.append(num); //append integer to sb
System.out.println("Give Number: "+num);
String str = sb.toString(); //convert sb to string
System.out.println("String equivalent: "+str);
}
}
Output:
Example 2: Converting char Array to String using toString()
public class JavaExample {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
//char array
char[] ch = {'a','e','i','o','u'};
//append array to StringBuilder
sb.append(ch);
//convert StringBuilder to String
String str = sb.toString();
System.out.println("String: "+str);
}
}
Output:
Example 3: Concatenating multiple data types and converting to String
public class JavaExample {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
char[] ch = {'a','e','i','o','u'};//char array
double num = 10001;//double
boolean b = true;//boolean
sb.append(ch);
sb.append(num);
sb.append(b);
//convert StringBuilder to String
String str = sb.toString();
System.out.println("String: "+str);
}
}
