//Sample12_02.java

import java.io.File;

class Sample12_02{
    public static void main(String[] args){

        File dir01 = new File(".");
        File[] files = dir01.listFiles();

        if(files!=null){
            int yangerIndex = 0;
            long maxModi = files[0].lastModified();
            if(files.length>1){
                for(int i=1; i<files.length; i++){
                    long modi = files[i].lastModified();
                    if(modi>maxModi){
                        maxModi = modi;
                        yangerIndex = i;
                    }
                }
            }
            File yangerFile = files[yangerIndex];
            System.out.println("yangerFile: " + yangerFile.getPath());
            String strDate = String.format(
                "%1$tY/%1$tm/%1$td %1$tH:%1$tM",
                maxModi
                );

            System.out.println("lastModified: " + strDate);
        }else{
            System.out.println("is null.");
        }
    }
}