use useRouter hook . It may resolve ur proble. import { useRouter } from ‘next/router’;
Add default value to property . See the below code we are passing empty string as default value <StyledHTML html= {landingPage?.helpCenter?.vocBodyMessage || ”} />
We can create thread in the following two ways . 1) By extending Thread class2) By implementing Runnable interface In this tutorial we are going to learn how to create
A thread is an independent path of execution of a program. We can run multiple threads simultaneously within a program . A thread can be in one of the below
Multitasking : Executing multiple tasks at the same time is called multi tasking . Here task can be program . Even multi tasking and multi processing words are being used
1) Collection interface is child of Iterable interface . 2) Collection interface provided the most common methods , which can be applied for any collection object 3) Following is the
In real time programming , Some times we need to group individual objects into single unit . We can achieve this using arrays . But arrays have below limitations .
In java, many modifiers are there, those are: 1) private2) protected3) public4) default5) Abstract6) Final7) Synchronised8) Volatile9) Static10) Native11) Transient default is not a keyword. If you don’t specify any
Package is collection of classes , interfaces and sub packages. Package must be a first statement of a class. To get package details getPackage() method is given in java.lang.Class .
In this tutorial we are going to learn how to get method details of a class . In java, methods are classified into two types they are . 1) Instance
In this tutorial we are going to learn how to get constructor and it’s parameter of a class . See the below example . package com.java; import java.lang.reflect.Constructor; class Sample
In this tutorial we are going to learn how to get all fields of a class . To get fields of a class , getDeclaredFields() method was provided in java.lang.Class
In this tutorial we are going to learn hot get interfaces implemented by class at run time . To get interfaces implemented by class , getInterfaces() method was provided in
In this tutorial we are going to learn , how to get all super classes of a class . To get super class of a class , getSuperclass() method was
In this tutorial we are going to check wheather loaded class is an interface definition or class definition . To check weather the .class file is as interface definition or
In this article we wre going to learn how to get class name of given object. package com.java; public class Sample { public void printClassName(Class c){ String cname = c.getName();
Every time a class was loaded into JVM , JVM creates a java.lang.Class object with the name ‘class’ in that class , that contains all the meta data of loaded
Reflection API is a collection of classes and interfaces given by SUN ,to get a meta data of a class at runtime. For example, we have a runtime class and
If we want to force the method to allow particuler type list or it’s super classes type list as parameter we have to use super keyword. See , below example.
In previous tutorial, we have seen how to use wild card character . Wild card character allows to pass any type of list as parameter to the method . Then,
‘?’ is used as wild card character in java generics concept . Before going to learn use of the wild card character, let’s see the sample below. import java.util.ArrayList; import
Before jdk 1.5 ArrayList class is defined as follows. class ArrayList {add(Object o) ;Object get(int index);– –} ➩ See the above code . The argument of add() method is Object,
In previous tutorial we used single class or interface as bounded type. But we can apply multiple bounded types at a time. See the below example. public class Sample<T extends
In this tutorial we are going to learn, What is bounded types and how to use it. See the below example. package sree; import java.util.Date; public class Sample<T> { T
In this tutorial we are going to learn, how to create custom generic class. See the below example. package sree; public class Student { String name; String id ; public
Before jdk 1.5 ArrayList class is defined as follows. class ArrayList {add(Object o) ;Object get(int index);– –} ➩ See the above code . The argument of add() method is Object,
Conclusion 1 : In java , Parent class or interface reference can hold child class object , this is called polymorphism . But coming to generics polymorphism will be applicable