Tag: How to in Java

Java How to – Find if the Class exists or not

Problem Statement You need to test for the presence of a class from your java program. Solution Use Class.forName method to find if a particular class exists. Below is a sample code snippet demonstrating the usage of Class.forName to find out if the class “test” exists. Note that this method throws an exception incase the class cannot be loaded. Note: You need to pass the…

Java How to – Get Environment Variables

Problem Statement You need to programmatically get the values of the environment variables from your java program. Solution Use java.lang.System.getenv method to get the environment variables from your java program from Java JDK 1.5 and higher version. You can pass the “PATH” as parameter to the method to retreive the path from the environment variable. When no arguments are passed, it returns all the environment…

Java How to – Compile and run Java program in Command-line

Problem Statement You need to compile and run your java program in command-line. Solution You can use the command-line tools available with Java Development Kit (JDK). The “javac” command tool can be used to compile the java program. The “java” command can be used to run the java program. Let’s build out first program and use the command line to run. 1. Download and install…

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