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final、finally、finalize的区别 - 《Java核心技术》笔记

final可以用来修饰变量、类、方法，final修饰的变量不可修改，final修饰的类不可扩展，final修饰的方法不可重写。

finally是保证重点代码一定要被执行到的机制。

finalize是Object的一个方法，它的设计目的是保证对象在被垃圾收集前完成特定资源的回收，已经不被推荐使用。推荐使用Cleaner机制：

public class CleaningExample implements AutoCloseable {
        // A cleaner, preferably one shared within a library
        private static final Cleaner cleaner = <cleaner>;
        static class State implements Runnable { 
            State(...) {
                // initialize State needed for cleaning action
            }
            public void run() {
                // cleanup action accessing State, executed at most once
            }
        }
        private final State;
        private final Cleaner.Cleanable cleanable
        public CleaningExample() {
            this.state = new State(...);
            this.cleanable = cleaner.register(this, state);
        }
        public void close() {
            cleanable.clean();
        }
    }