相对绝对路径

* 路径分隔符 ;
* 文件分隔符 \

package mypro04;
/**
 * 路径分隔符  ;
 * 文件分隔符 \
 */

import java.io.File;

public class TestFIile {
    public static void main(String[] args) {
        //路径分隔符  ;
        System.out.println(File.pathSeparator);
        //文件分隔符 \
        System.out.println(File.separator);
        

        
        System.out.println("***********相对路径*******************");        
        //相对路径
        String parentpath="D:/learn/java/mycode"; //"D:/learn/java/mycode/"
        String name="Welcome.class";
        File file=new File(parentpath,name);
        
        
        System.out.println(file.getName());        //Welcome.class
        System.out.println(file.getPath());        //D:\learn\java\mycode\Welcome.class
        System.out.println(file.getParent());      //D:\learn\java\mycode        
        System.out.println(file.getAbsolutePath());//D:\learn\java\mycode\Welcome.class
        
        
        System.out.println("**********绝对路径********************");
        //绝对路径
        String absolutePath="D:/learn/java/mycode/Welcome.class";
        File file1=new File(absolutePath);
        System.out.println(file1.getName()); //         Welcome.class
        System.out.println(file1.getPath());//          D:\learn\java\mycode\Welcome.class
        System.out.println(file1.getParent());//         D:\learn\java\mycode
        System.out.println(file1.getAbsolutePath());//  D:\learn\java\mycode\Welcome.class
        
        System.out.println("**********没有盘符********************");
        //没有盘符 ；,以user.dir构建
        File file2=new File("Welcome.class");
        System.out.println(file2.getName()); //         Welcome.class
        System.out.println(file2.getPath());//          Welcome.class
        System.out.println(file2.getParent());//         null
        System.out.println(file2.getAbsolutePath());//  D:\software\eclipse\eclipse-workspace\mypro04\Welcome.class
                
    }


}