Look directly at the code.
Package gdk.ware;
Import Java.text.SimpleDateFormat;
Import Java.util.Date;
Import Java.util.HashMap;
Import Java.util.Map.Entry;
Import Org.testng.annotations.Test;
Traversal of Map
@Test
public class Newhashmap {
Static hashmap<string, string> map=new hashmap<string,string> () {{put ("a", "a++");p ut ("b", "b++");}};
Traverse
public static void Main ()
{
System.out.println ("Start traversal");
For (String Key:map.keySet ())
{
System.out.println ("key:" + key + ", value=" +map.get (key));
}
Traversal Method 2
SYSTEM.OUT.PRINTLN ("Traverse map via Map.entryset");
For (entry<string, string> entry:map.entrySet ()) {
System.out.println ("key:" + entry.getkey () + ", value=" +entry.getvalue ());
}
}
Sort strings in reverse order
public void sort ()
{
String a= "ABCDE";
String b= "";
Char[] Chararray=a.tochararray ();
for (int i= (chararray.length-1); i>=0;i--) {
System.out.println (B+=chararray[i]);
B+=chararray[i];
}
System.out.println (b);
}
Output Month Day seconds
public void Datenow () {
SimpleDateFormat format=new SimpleDateFormat ("Yyyy-mm-dd hh-mm-ss");
Date date = new Date ();
Format.format (date);
SYSTEM.OUT.PRINTLN (date);
}
}
Some basic interview Java knowledge, popularized under. Both development and testing are available.