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Java Compiler compileClass() method with example

Compiler Class compileClass() method: Here, we are going to learn about the compileClass() method of Compiler Class with its syntax and example.
Submitted by Preeti Jain, on December 02, 2019

Compiler Class compileClass() method

• compileClass() method is available in java.lang package.
• compileClass() method is used to Compiles the given class.
• compileClass() method is a static method, it is accessible with the class name and if we try to access the method with the class object then we will not get any error.
• compileClass() method may throw an exception at the time of compiling the given class.
  NullPointerException: This exception may throw when a given Class parameter is null exists.

Syntax:

    public static boolean compileClass(Class cl_name);

Parameter(s):

• Class cl_name – represents the name of the class.

Return value:

The return type of this method is String, it returns the following values based on the given cases,

• It returns true when the given class is compiled successfully.
• It returns false when the given class is failed or no compiler exists.

Example:

// Java program to demonstrate the example 
// of boolean compileClass(Class cl_name) method of Compiler 

public class Parent {
    public static void main(String args[]) {
        // Creating a Parent and Child class object
        Parent p1 = new Parent();
        Parent p2 = new Child();

        // By using getClass() method is to get a Parent class
        Class cl1 = p1.getClass();
        System.out.println("p1.getClass() = " + cl1);

        // By using getClass() method is to get a Child class
        Class cl2 = p2.getClass();
        System.out.println("p2.getClass() = " + cl2);

        // By using compileClass(Class cl) method is to compile Parent class
        // it return boolean values if it returns then given class is compiled 
        // successfully otherwise compilation failed or no compiler exists
        boolean status = Compiler.compileClass(cl1);
        System.out.println("Compiler.compileClass(cl1) = " + status);
    }
}

class Child extends Parent {
    public void show() {
        System.out.println("We are in Child class: ");
    }
}

Output

p1.getClass() = class Parent
p2.getClass() = class Child
Compiler.compileClass(cl1) = false