?? arraycreator.java
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import java.lang.reflect.Array;import java.lang.reflect.Constructor;import java.lang.reflect.InvocationTargetException;import java.util.regex.Pattern;import java.util.regex.Matcher;import java.util.Arrays;import static java.lang.System.out;public class ArrayCreator { private static String s = "java.math.BigInteger bi[] = { 123, 234, 345 }"; private static Pattern p = Pattern.compile("^\\s*(\\S+)\\s*\\w+\\[\\].*\\{\\s*([^}]+)\\s*\\}"); public static void main(String... args) { Matcher m = p.matcher(s); if (m.find()) { String cName = m.group(1); String[] cVals = m.group(2).split("[\\s,]+"); int n = cVals.length; try { Class<?> c = Class.forName(cName); Object o = Array.newInstance(c, n); for (int i = 0; i < n; i++) { String v = cVals[i]; Constructor ctor = c.getConstructor(String.class); Object val = ctor.newInstance(v); Array.set(o, i, val); } Object[] oo = (Object[])o; out.format("%s[] = %s%n", cName, Arrays.toString(oo)); // production code should handle these exceptions more gracefully } catch (ClassNotFoundException x) { x.printStackTrace(); } catch (NoSuchMethodException x) { x.printStackTrace(); } catch (IllegalAccessException x) { x.printStackTrace(); } catch (InstantiationException x) { x.printStackTrace(); } catch (InvocationTargetException x) { x.printStackTrace(); } } }}
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