Java Compiler disable() Method

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Description

The Java Compiler disable() method cause the Compiler to cease operation.

Note − This API is deprecated since Java 9 and is not available Java 21 onwards.

Declaration

Following is the declaration for java.lang.Compiler.disable() method

public static void disable()

Parameters

NA

Return Value

This method does not return any value.

Exception

NA

Enabling and Disabling a Compiler Example

The following example shows the usage of java.lang.Compiler.disable() method. In this program, we've enabled the compiler using enable() method. Then prepare a compile command using command() method. Then we've retrieved hashcode of a new Integer object created and printed the same. In the end, we've disabled the compiler using disable() method.

package com.tutorialspoint;

public class CompilerDemo {

   public static void main(String[] args) {

      // checking if compiler is enabled or not        
      Compiler.enable();
      System.out.println("Compiler Enabled...");                          
      Compiler.command("{java.lang.Integer.*}(compile)");

      Integer i = new Integer("30");
    
      // returns a hash code value
      int retval = i.hashCode();
      System.out.println("Value = " + retval); 
 
      // disable the compiler
      System.out.println("Disabling Compiler..."); 
      Compiler.disable();                             
   }
} 

Output

Let us compile and run the above program, this will produce the following result −

Compiler Enabled...
Value = 30
Disabling Compiler...