Util.java

package mstparser;

import java.text.DecimalFormat;

/**
 * Utility methods that may be generally useful.
 *
 * @author Jason Baldridge @created August 27, 2006
 */
public class Util {

    // Assumes input is a String[] containing integers as strings.
    public static int[] stringsToInts(String[] stringreps) {
        int[] nums = new int[stringreps.length];
        for (int i = 0; i < stringreps.length; i++) {
            nums[i] = Integer.parseInt(stringreps[i]);
        }
        return nums;
    }

    // Assumes input is a String[] containing doubles as strings.
    public static double[] stringsToDoubles(String[] stringreps) {
        double[] nums = new double[stringreps.length];
        for (int i = 0; i < stringreps.length; i++) {
            nums[i] = Double.parseDouble(stringreps[i]);
        }
        return nums;
    }

    public static String join(String[] a, char sep) {
        StringBuilder sb = new StringBuilder();
        sb.append(a[0]);
        for (int i = 1; i < a.length; i++) {
            sb.append(sep).append(a[i]);
        }
        return sb.toString();
    }

    public static String join(int[] a, char sep) {
        StringBuilder sb = new StringBuilder();
        sb.append(a[0]);
        for (int i = 1; i < a.length; i++) {
            sb.append(sep).append(a[i]);
        }
        return sb.toString();
    }

    public static String join(double[] a, char sep, int fractionDigits) {
        StringBuilder sb = new StringBuilder();
        DecimalFormat df = new DecimalFormat();
        df.setMaximumFractionDigits(fractionDigits);
        sb.append(df.format(a[0]));
        for (int i = 1; i < a.length; i++) {
            sb.append(sep).append(df.format(a[i]));
        }
        return sb.toString();
    }
}