how to remove certain characters from string in java code example

Example 1: Java remove character from string

// remove last character from string in java
public class SubstringDemo
{
   public static void main(String[] args)
   {
      String strInput = "Flower Brackets!";
      String strOutput = strInput.substring(0, strInput.length() - 1);
      System.out.println(strOutput);
   }
}

Example 2: how to remove letters from string java

public extractLetters(String str){
	String result="";
	for(int i= 0; i< str.length; i++){
	    if(Character.isLetter(str.charAt(i))){
	    result+=str.charAt(i);
	  	}
	}