Common BUG-string replacement

public static void main(String[] args) throws ParseException { 
    //User name 
    String name = ""; 
    //Character conversion and replacement 
    String message = "***Hello, your order has been paid successfully, we will reply you as soon as possible Shipping."; 
    //Replace *** 
    String replace = null; 
    try { 
        replace = message.replace("***", name); 
    } catch (Exception e) { 
        e.printStackTrace(); 
    } 
    System.out .println(replace); 
}

When the string is an empty string, no error will be reported

Console output:

 

public static void main(String[] args) throws ParseException { 
    //User name 
    String name = null; 
    //Character conversion and replacement 
    String message = "***Hello, your order has been paid successfully, we will send you a message as soon as possible Goods."; 
    //Replace *** 
    String replace = null; 
    try { 
        replace = message.replace("***", name); 
    } catch (Exception e) { 
        e.printStackTrace(); 
    } 
    System.out. println(replace); 
}

If it is null, an error will be reported, see the requirement to add a non-null judgment