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22=2`2`2`
33=3`33333`3`
n=3


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Java code:

import java.util.*;
import java.io.*;
import java.net.*;
public class PropertyTest{
public static void main(String rags[])throws Exception{
URL url=PropertyTest.class.getResource("1.properties") ;
String path=URLDecoder.decode(url.getFile(),"UTF-8");
File f=new File(path);
Properties props=new Properties();
FileInputStream fis=new FileInputStream(path);
props.load(fis);
fis.close();
props.remove("password");
FileOutputStream fos=new FileOutputStream(path);
props.store(fos,"");
fos.close();
}
}


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username=aaa
password=aaa
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