file获取路径区别

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这里

import java.io.File;

class Scratch {
    public static void main(String[] args) throws Exception {
        File file = new File("../scratch.java");
        String path = file.getPath();
        String absolutePath = file.getAbsolutePath();
        String canonicalPath = file.getCanonicalPath();
        System.out.println("path:" + path);
        System.out.println("absolutePath:" + absolutePath);
        System.out.println("canonicalPath:" + canonicalPath);
    }
}

三种获取路径

getPath是获取构造File传入的路径

输出为：

path:../scratch.java

getAbsolutePath是获取绝对路径

absolutePath:/Users/achao/IdeaProjects/stream-query/../scratch.java

还有一个getCanonicalPath是返回相对路径