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public String[] split(String regex)
Splits this string around matches of the given regular expression. 
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import java.net.*;
import java.io.*;
public class PortScanner {
    public static void main(String args[]){
    String host="localhost";
    new PortScanner().scan(host);
    }
    public void scan(String host){
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double a = 2.3659874;
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DecimalFormat df = new DecimalFormat("0.000");
String num = df.format(a);
System.out.println(num);
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