Java的：for循环，不兼容的类型 [英] Java: for loop, incompatible types

问题描述

我试图for循环运行此;

I'm trying to run this for loop;

        for (int col= 0; grid[0].length; col++)

不过，我尝试编译我得到一个错误，说明每次不兼容的类型 - 发现INT但预计布尔

However every time I try to compile I get an error stating 'incompatible types - found int but expected boolean'

我不知道是什么，我做错了！

I can't work out what I'm doing wrong!

推荐答案

第二条语句：电网[0]。长度是一个整数。在fo​​r循环中第二条语句是一个条件语句，需要是一个布尔值。

the second statement: grid[0].length is an integer. The second statement in a for loop is a condition statement and needs to be a boolean.

如果你想循环而山坳低于电网的长度[0]，那么你需要将此作为你的第二个语句：

If you're trying to loop while col is less than the length of grid[0], then you need this as your second statement:

＆山坳LT;电网[0]。长度;

col < grid[0].length;

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