Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import sun.misc.Unsafe;
import java.lang.reflect.Field;

import java.security.AccessController;
import java.security.PrivilegedExceptionAction;

public class Main {
    /**
     * Gets the {@code sun.misc.Unsafe} instance, or {@code null} if not available on this platform.
     */
    private static sun.misc.Unsafe getUnsafe() {
        sun.misc.Unsafe unsafe = null;
        try {
            unsafe = AccessController.doPrivileged(new PrivilegedExceptionAction<Unsafe>() {
                @Override
                public sun.misc.Unsafe run() throws Exception {
                    Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class;

                    for (Field f : k.getDeclaredFields()) {
                        f.setAccessible(true);
                        Object x = f.get(null);
                        if (k.isInstance(x)) {
                            return k.cast(x);
                        }
                    }
                    // The sun.misc.Unsafe field does not exist.
                    return null;
                }
            });
        } catch (Throwable e) {
            // Catching Throwable here due to the fact that Google AppEngine raises NoClassDefFoundError
            // for Unsafe.
        }
        return unsafe;
    }
}