An important usage would be to find the compiler that is available in the current context. The method getSystemJavaCompiler() returns the Java compiler if available or else returns null.

import javax.tools.*;public class JavaxTools{    public static void main(String[] args)    {      JavaxTools javaxTools = new JavaxTools();      javaxTools.proceed();   }      private void proceed()   {      System.setProperty( "java.home", "/usr/bin/java/jdk1.8.0_102");      JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();            System.out.println(compiler);   }}/*

Expected output:

[root@mypc]# java JavaxToolscom.sun.tools.javac.api.JavacTool@7d4991ad

Note: The output need not be same as the one specified here */