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The insert () method — in Java, inserts characters into this buffer string (StringBuffer). The substring is added before the specified index.

The syntax of the method for each data type is:

public StringBuffer insert(int offset, boolean b)
public StringBuffer insert(int offset, char c)
public insert(int offset, char[] str)
public StringBuffer insert(int index, char[] str, 
                           int offset, int len)
public StringBuffer insert(int offset, float f)  
public StringBuffer insert(int offset, int i)
public StringBuffer insert(int offset, long l) 
public StringBuffer insert(int offset, Object obj) 
public StringBuffer insert(int offset, String str)

Detailed information about the parameters:

public class Test {
 public static void main(String args[]) {
      StringBuffer sb = new StringBuffer("wikchy");
      sb.insert(3,"ite");
      System.out.println(sb); 
   }  
}

wikitechy