A-M baby

Task/Largest-int-from-concatenated-ints/Java/largest-int-from-concatenated-ints.java

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+import java.util.*;
+
+public class IntConcat {
+
+    private static Comparator<Integer> sorter = new Comparator<Integer>(){
+        @Override
+        public int compare(Integer o1, Integer o2){
+            String o1s = o1.toString();
+            String o2s = o2.toString();
+
+            if(o1s.length() == o2s.length()){
+                return o2s.compareTo(o1s);
+            }
+
+            int mlen = Math.max(o1s.length(), o2s.length());
+            while(o1s.length() < mlen * 2) o1s += o1s;
+            while(o2s.length() < mlen * 2) o2s += o2s;
+
+            return o2s.compareTo(o1s);
+        }
+    };
+
+    public static String join(List<?> things){
+        String output = "";
+        for(Object obj:things){
+            output += obj;
+        }
+        return output;
+    }
+
+    public static void main(String[] args){
+        List<Integer> ints1 = new ArrayList<Integer>(Arrays.asList(1, 34, 3, 98, 9, 76, 45, 4));
+
+        Collections.sort(ints1, sorter);
+        System.out.println(join(ints1));
+
+        List<Integer> ints2 = new ArrayList<Integer>(Arrays.asList(54, 546, 548, 60));
+
+        Collections.sort(ints2, sorter);
+        System.out.println(join(ints2));
+    }
+}