打印小片断，免得写System.out.println()
private static void p(Object o) {System.out.println(o);}private static void p(int o) {System.out.println(o);}private static void p(long o) {System.out.println(o);}private static void p(boolean o) {System.out.println(o);}private static void pc(java.util.Collection c) {java.util.Iterator it = c.iterator();while (it.hasNext()) {p(it.next());}}private static void pa(Object[] c) {if (c == null) {p(null);return;}pc(Arrays.asList(c));}
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