Move java examples

examples/java/LinearAssignmentAPI.java

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+// Copyright 2010-2017 Google
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import com.google.ortools.graph.LinearSumAssignment;
+
+/**
+ * Test assignment on a 4x4 matrix. Example taken from
+ *  http://www.ee.oulu.fi/~mpa/matreng/eem1_2-1.htm with kCost[0][1]
+ *  modified so the optimum solution is unique.
+ *
+ */
+
+public class LinearAssignmentAPI {
+
+ static {
+    System.loadLibrary("jniortools");
+  }
+
+
+  private static void runAssignmentOn4x4Matrix() {
+    final int numSources = 4;
+    final int numTargets = 4;
+    final int[][] cost = {{ 90, 76, 75, 80 },
+                          { 35, 85, 55, 65 },
+                          { 125, 95, 90, 105 },
+                          { 45, 110, 95, 115 }};
+    final int expectedCost = cost[0][3] + cost[1][2] + cost[2][1] + cost[3][0];
+
+    LinearSumAssignment assignment = new LinearSumAssignment();
+    for (int source = 0; source < numSources; ++source) {
+      for (int target = 0; target < numTargets; ++target) {
+        assignment.addArcWithCost(source, target, cost[source][target]);
+      }
+    }
+
+    if (assignment.solve() == LinearSumAssignment.Status.OPTIMAL) {
+      System.out.println("Total cost = " + assignment.getOptimalCost() + "/" + expectedCost);
+      for (int node = 0; node < assignment.getNumNodes(); ++node) {
+        System.out.println("Left node " + node
+            + " assigned to right node " + assignment.getRightMate(node)
+            + " with cost " + assignment.getAssignmentCost(node));
+      }
+    } else {
+      System.out.println("No solution found.");
+    }
+  }
+
+  public static void main(String[] args) throws Exception {
+    LinearAssignmentAPI.runAssignmentOn4x4Matrix();
+  }
+}