Raja has Published 806 Answers

How to compile & run a Java program using Command Prompt?

raja
raja
Published on 23-May-2019 13:22:21
While many programming environments allow us to compile and run a program within the environment, we can also compile and run java programs using Command Prompt.After successful installation of JDK in our system and set the path, we can able to compile and execute Java programs using the command prompt.Step ... Read More

What are the different steps involved to execute a Java program?

raja
raja
Published on 23-May-2019 10:48:39
Java program execution follows 5 majors stepsEdit - Here the programmer uses a simple editor or a notepad application to write the java program and in the end give it a ".java" extension.Compile - In this step, the programmer gives the javac command and the .java files are converted into ... Read More

Scope and lifetime of variables in Java?

raja
raja
Published on 23-May-2019 10:33:40
Instance VariablesA variable which is declared inside a class and outside all the methods and blocks is an instance variable. The general scope of an instance variable is throughout the class except in static methods. The lifetime of an instance variable is until the object stays in memory.Class VariablesA variable ... Read More

How to set Temporary and Permanent Paths in Java?

raja
raja
Published on 22-May-2019 14:59:13
There are two ways to set the path in java, First is Temporary Path and second is Permanent Path.Setting Temporary PathOpen command prompt in WindowsCopy the path of jdk/bin directory where java located (C:\Program Files\Java\jdk_version\bin)Write in the command prompt: SET PATH=C:\Program Files\Java\jdk_version\bin and hit enter command.Setting Permanent PathGo to My ... Read More

How to set JAVA_HOME environment variables on Windows OS in Java?

raja
raja
Published on 22-May-2019 14:23:30
Once you have installed JDK version on your windows machine, you have to set up Environment Variables.Please find below steps to set the java pathGo to My Computer ---> Right Click on it ---> Advanced System Settings ---> Advanced Tab ---> Click on Environment VariablesNow you have to alter the ... Read More

Must we implement all the methods in a class that implements an interface in Java?

raja
raja
Published on 22-May-2019 11:51:58
Yes, it is mandatory to implement all the methods in a class that implements an interface until and unless that class is declared as an abstract class.There are only two choices −Implement every method defined by the interface.Declare the class as an abstract class, as a result, forces you to ... Read More
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