class Ideone {
public static void main 
(String[] args
) {     int i = 1;
    int j = 3;
    String first 
= str.
substring(0, i
); char second = str.charAt(j);
String third 
= str.
substring(i 
+ 1, j
); // Note: corrected bug! char fourth = str.charAt(i);
String fifth 
= str.
substring(j 
+ 1);  
System.
out.
println(first 
+ second 
+ third 
+ fourth 
+ fifth
);  
}
}
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