Introduction The java.lang.Character class includes many useful static methods with which text (or characters) can be manipulated. The other text manipulating classes are String, StringBuffer, StringTokenizer and StringBuilder. The Character class is a wrapper class for char data type. That is, a Character object represents char as an object; it gives an object form to …
Introduction The instanceof keyword is very useful to know whether an object belongs to which class. The instanceof evaluates to true if an object belongs to a specified class or its super class; else raises compilation error. The following program illustrates. public class InstanceDemo { public static void main(String args[]) { String s1 = “hello”; …
hashCode() vs equals(): About Hash code hashCode() is a method of Object class. Hash code is an integer representation of an object by JVM. Hash code is system generated using some formula (let us not go much of detais of formula). Hash codes generated need not be the same for different times of execution. Internally, …
Introduction Object class has got very prominence in Java programming. In inheritance, it sits at the top of the hierarchy. That is, any Java class, either you write or predefined, should be a subclass of Object class. If you write any class, Java implicitly extends Object class. Why this? Java designers thought that some methods …
About toString() method Summary: Java comes with two styles of converting object into string form. "toString() method Convert Object to String form" discusses using toString() method. We discussed toString() method in String class to some extent. Let us go more detailed here. toString() of Object class converts only objects into string form (remember, valueOf() of …
Introduction Java is an object-oriented language and can view everything as an object. A simple file can be treated as an object (with java.io.File), an address of a system can be seen as an object (with java.util.URL), an image can be treated as an object (with java.awt.Image) and a simple data type can be converted …
