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Pattern class Question in Examlab

 
Ranch Hand
Posts: 36
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Got this question in PE1 of Exam lab:

import java.text.*;
import java.util.*;
import java.util.regex.*;
import java.io.*;

public class Expons{

static Stores st;

public static void main(String argv[]){
st=new Stores();
Object ob1=getFormattedObject(Pattern.compile("H[a-d][k-m]"), "H[a-b][k-m]");
Object ob2=getFormattedObject(st.pt1.matcher("Hello Hallo"), "[a-e][l]lo");
Object ob3=getFormattedObject(null);
System.out.println(ob3);
}

public static Object getFormattedObject(Object ob, String... s){
if (ob instanceof Pattern){
st.pt1=((Pattern)ob).compile(s[0]);
return null;
}else if (ob instanceof Matcher){
st.mt1=(Matcher)ob;
return null;
}else{
st.mt1.find();
st.st1=st.mt1.group();
return st.st1;
}
}

}


class Stores{
Pattern pt1; Matcher mt1; String st1;
}

can anyone explain this program? Output: HAL.



 
Greenhorn
Posts: 8
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The program can be clear like this

Pattern.compile("H[a-d][k-m]");
System.out.println(st.pt1.matcher("Hello Hallo").group());

 
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