StringBuilder get,delete,set char

In this chapter you will learn:

How to get a single char from StringBuilder
How to change a single char for StringBuilder
How to delete a char at specified index

Get a single char from StringBuilder

char charAt(int index) returns the char value in this sequence at the specified index.

public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");
/*from jav a  2s  .c om*/
    char ch = sb.charAt(0);
    
    System.out.println(ch);

  }
}

The output:

Change a single char for StringBuilder

void setCharAt(int index, char ch) sets char at the specified index.

public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");
/*from java  2  s.  co m*/
   
    sb.setCharAt(0, 'J');
    
    System.out.println(sb.toString());

  }
}

The output:

Delete a char at specified index

StringBuilder deleteCharAt(int index) removes the char at the specified position in this sequence.

public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");
//from  j  av a  2  s. c o m
   
    sb.deleteCharAt(0);
    
    System.out.println(sb.toString());

  }
}