How to Convert char to String
String and Character classes from java.lang package provide methods to convert a primitive character to String. String.valueOf(char) Character.toString(char)
Month: April 2020
String to Integer Conversion
If you want to utilize a number in calculations which you have received as string, it might create some unexpected issues. For example, below program simply appends two numbers instead of performing addition. Integer.parseInt(String) Package java.lang provides a wrapper class called as Integer which has parseInt method that can convert string to signed decimal integer. … Read more
Reading Substring in Java
A substring is a String object created from another String object. In Java, you can get substring in multiple ways based on which String class you are using. Classes like String, StringBuffer, StringBuilder have substring and subSequence methods which can return substring. One thing we have to remember is that the index of string start … Read more
Comparing Two String Objects in Java
String class provides equals method for comparing two String objects. Comparing two String variables: Output: However, this may result in NullPointerException if str1 is null. So, it is always better to check if the reference variable is not null, which is calling the equals method. Output: You don’t have to null check for the variable … Read more
Callback Function in Node.js
A callback function is a function which can be passed as an argument into another function. This callback function can then be invoked inside the outer function. Callback functions were introduced in JavaScript. Since Node.js built on V8 engine, it also support callback functions. In the above example, doComplete is a callback function. This program … Read more
