Compiler Class in Java

09 Feb, 2022
Compiler Class provides support and related services to Java code to Native Code. Native code is a form of code that can be said to run in a virtual machine (for example, [JVM]Java Virtual Machine). 
Declaration:
public final class Compiler extends Object
The java.lang.Compiler.command() tests the argument type and performs some documented operations. 
Syntax: 
public static boolean command(Object argument)
Parameters:
argument: needs to be compiler-specific.
Return: It returns the compiler-specific value.
Exception: It throws NullPointerException.
The java.lang.Compiler.compileClass() compiles the specified class. 
Syntax: 
public static boolean compileClass(Class c)
Parameters: 
c: class to be compiled.
Return: It returns true if the compilation succeeded. Else, false.
Exception:  It throws NullPointerException.
The java.lang.Compiler.enable() cause compiler to start operation. 
Syntax : 
public static void enable()
Return: It returns nothing.
The java.lang.Compiler.disable() stops compiler to perform operations. 
Syntax : 
public static void disable()
Return: It returns nothing.
The java.lang.Compiler.compileClasses() compiles the classes having the name as string – “str”.
Syntax: 
public static boolean compileClasses(String string)
Parameters: 
str: name of the class to be compiled.
Return: It returns true if the classes are compiled successfully.
Exception: It throws NullPointerException.
Java
// Java Program illustrating the use// of Compiler class Methods. import java.lang.*; public class NewClass {    public static void main(String[] args)    {        CompilerClass geek = new CompilerClass();         // Use of enable() :        Compiler.enable();         // class CompilerDemo        Class c = geek.getClass();        System.out.println(c);         // Use of command() :        Object g = Compiler.command("javac CompilerClass");        System.out.println("Value : " + g);         // Use of compileClass :        // Since it is not a subclass so there is no        // compiler for it        boolean check = Compiler.compileClass(c);        System.out.println(            "\nIs compilation successful ? : " + check);         String str = "CompilerClass";        boolean check1 = Compiler.compileClasses(str);         System.out.println(            "\nIs compilation successful using str ? : "            + check1);         // Use of disable() :        Compiler.disable();    }     private static class CompilerClass {        public CompilerClass() {}    }}
Output:
class NewClass$CompilerClass
Value : null

Is compilation successful ? : false

Is compilation successful using str ? : false
Note: The Compiler Class in Java inherits others methods from the Object class in Java.
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