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Accessing local variable inside Anonymous class in Java
package beginner;
/**
* Java Program to demonstrate how to access local variable
* inside Anonymous class and lambda expression in Java.
*
* @author WINDOWS 10
*
*/
public class HelloWorldApp {
public static void main(String... args){
// count must be final if you want to access it inside
// anonymous class
final int count = 10;
Thread t = new Thread(){
public void run(){
// Cannot refer to a non-final variable count
// inside an inner class defined in a different method
System.out.println(count);
}
};
t.start();
}
}
/**
* Java Program to demonstrate how to access local variable inside Anonymous
* class and lambda expression in Java.
*
* @author WINDOWS 10
*
*/
public class Java8Demo {
public static void main(String... args) {
// in Java 8, final is not mandatory
// unless you are not assigning value
// to the local variable again
int count = 10;
Thread t = new Thread() {
@Override
public void run() {
System.out.println(count); // Ok in Java 8
// local variables referenced from an inner class
// must be final or effectively final
// System.out.println(count++); // not ok
}
};
t.start();
}
}
Accessing local variable inside lambda expression
public class Java8Demo {
public static void main(String... args) {
// you can access final or effectively fina variable
// inside lambda expression.
int count = 10;
Runnable r = () -> {
System.out.println(count); // Ok in Java 8
};
Thread t = new Thread(r);
t.start();
}
}
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