![java package tutorial](/java/lang/images/java.jpg)
- Java.lang Package classes
- Java.lang - Home
- Java.lang - Boolean
- Java.lang - Byte
- Java.lang - Character
- Java.lang - Character.Subset
- Java.lang - Character.UnicodeBlock
- Java.lang - Class
- Java.lang - ClassLoader
- Java.lang - Compiler
- Java.lang - Double
- Java.lang - Enum
- Java.lang - Float
- Java.lang - InheritableThreadLocal
- Java.lang - Integer
- Java.lang - Long
- Java.lang - Math
- Java.lang - Number
- Java.lang - Object
- Java.lang - Package
- Java.lang - Process
- Java.lang - ProcessBuilder
- Java.lang - Runtime
- Java.lang - RuntimePermission
- Java.lang - SecurityManager
- Java.lang - Short
- Java.lang - StackTraceElement
- Java.lang - StrictMath
- Java.lang - String
- Java.lang - StringBuffer
- Java.lang - StringBuilder
- Java.lang - System
- Java.lang - Thread
- Java.lang - ThreadGroup
- Java.lang - ThreadLocal
- Java.lang - Throwable
- Java.lang - Void
- Java.lang Package extras
- Java.lang - Interfaces
- Java.lang - Errors
- Java.lang - Exceptions
- Java.lang Package Useful Resources
- Java.lang - Useful Resources
- Java.lang - Discussion
Java Compiler enable() Method
Description
The Java Compiler enable() method cause the Compiler to resume 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.enable() method
public static void enable()
Parameters
NA
Return Value
This method does not return any value.
Exception
NA
Enabling a Compiler Example
The following example shows the usage of java.lang.Compiler.enable() 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.
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("50"); // returns a hash code value int retval = i.hashCode(); System.out.println("Value = " + retval); } }
Output
Let us compile and run the above program, this will produce the following result −
Compiler Enabled... Value = 50
java_lang_compiler.htm
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