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64 lines
2.5 KiB
Java
64 lines
2.5 KiB
Java
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import edu.princeton.cs.introcs.In;
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import edu.princeton.cs.introcs.StdIn;
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import edu.princeton.cs.introcs.StdOut;
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/*************************************************************************
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* Compilation: javac LookupCSV.java
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* Execution: java LookupCSV file.csv keyField valField
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* Dependencies: ST.java In.java StdIn.java StdOut.java
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* Data files: http://algs4.cs.princeton.edu/35applications/DJIA.csv
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* http://algs4.cs.princeton.edu/35applications/UPC.csv
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* http://algs4.cs.princeton.edu/35applications/amino.csv
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* http://algs4.cs.princeton.edu/35applications/elements.csv
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* http://algs4.cs.princeton.edu/35applications/ip.csv
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* http://algs4.cs.princeton.edu/35applications/morse.csv
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*
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* Reads in a set of key-value pairs from a two-column CSV file
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* specified on the command line; then, reads in keys from standard
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* input and prints out corresponding values.
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*
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* % java LookupCSV amino.csv 0 3 % java LookupCSV ip.csv 0 1
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* TTA www.google.com
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* Leucine 216.239.41.99
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* ABC
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* Not found % java LookupCSV ip.csv 1 0
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* TCT 216.239.41.99
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* Serine www.google.com
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*
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* % java LookupCSV amino.csv 3 0 % java LookupCSV DJIA.csv 0 1
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* Glycine 29-Oct-29
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* GGG 252.38
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* 20-Oct-87
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* 1738.74
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*
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*
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*************************************************************************/
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public class LookupCSV {
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public static void main(String[] args) {
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int keyField = Integer.parseInt(args[1]);
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int valField = Integer.parseInt(args[2]);
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// symbol table
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ST<String, String> st = new ST<String, String>();
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// read in the data from csv file
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In in = new In(args[0]);
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while (in.hasNextLine()) {
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String line = in.readLine();
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String[] tokens = line.split(",");
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String key = tokens[keyField];
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String val = tokens[valField];
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st.put(key, val);
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}
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while (!StdIn.isEmpty()) {
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String s = StdIn.readString();
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if (st.contains(s)) StdOut.println(st.get(s));
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else StdOut.println("Not found");
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}
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}
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}
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