JAVA使用for循环会重复调用list.size()吗4

最近有朋友讨论说for循环里不要用list.size(),这样会导致每次都调用一次list.size()接口会耗性能,建议我们在外面使用一个变量来存储这个list.size()的值再放到循环里面,真的是这样吗?我做了个小测试,代码如下:

public class Test2 {
public static void main(String[] args) {
List list = new ArrayList();

    list.add("1");
    list.add("2");

    for (int i = 0; i < list.size(); i++) {
        System.out.println(i);
    }
}

}
这里将list.size()放在了for循环里,按朋友的说法,这里应该会调用多次。

接下来我查看了字节码发现,这里确实会调用多次list.size()方法,字节码如下:

具体字节码指令解析可查看:
接着查看了ArrayList调用size()方法的源码是直接返回一个int 型的 size变量的,而这个size变量是每次新增和删除都会改变这个size的值

结论:经过网友们热情的探讨与更正,for循环里会多次调用list.size(),list.size()方法会直接返回一个声明在类中的size全局变量,虽然这个size会直接保存在堆中,但每次发生函数调用确实会发生压栈出栈的性能开销。

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