Ex.65
import java.util.*;
public class WrappedString {
private String s;
public WrappedString(String s ) {
this.s = s;
}
public static void main(String args[]){
HashSet<Object> hs = new HashSet<Object>();
WrappedString ws1 = new WrappedString("aardvark");
WrappedString ws2 = new WrappedString("aardvark");
String s1 = new String("aardvark");
String s2 = new String("aardvark");
hs.add(ws1);
hs.add(ws2);
hs.add(s1);
hs.add(s2);
System.out.print(hs.size());
}
}
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output is 3
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import java.util.*;
public class WrappedString {
private String s;
public WrappedString(String s ) {
this.s = s;
}
public static void main(String args[]){
HashSet<Object> hs = new HashSet<Object>();
WrappedString ws1 = new WrappedString("aardvark");
WrappedString ws2 = new WrappedString("aardvark");
String s1 = new String("aardvark");
String s2 = new String("aardvark");
hs.add(ws1);
hs.add(ws2);
hs.add(s1);
hs.add(s2);
System.out.print(hs.size());
}
public boolean equals(Object o){
if(this.s.equals(((WrappedString)o).s))
return true;
else
return false;
}
public int hashCode(){
return this.s.hashCode();
}
}
---------------------------------
output is 2
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