how to remove last element of string code example

Example 1: remove last character string

let str = "Hello world"
let strWithoutLastChar = str.substring(0, str.length - 1)

Example 2: remove last character from string

public String method(String str) {
    if (str.charAt(str.length()-1)=='x'){
        str = str.replace(str.substring(str.length()-1), "");
        return str;
    } else{
        return str;
    }
}