工厂方法VS构造器

package bb.cc;

import java.io.PrintStream;
import java.text.NumberFormat;

public class MyTool { 
      public static void main(String[] args) {
        NumberFormat currentFormat=NumberFormat.getCurrencyInstance();
        NumberFormat percentFormat=NumberFormat.getPercentInstance();
        double x=0.1;
        System.out.println(currentFormat.format(x));
        System.out.println(percentFormat.format(x));
    }
}