Move java examples

2018-07-06 21:03:33 +02:00
parent 6485017458
commit 13a566bed4
58 changed files with 340 additions and 693 deletions
--- a/examples/java/Xkcd.java
+++ b/examples/java/Xkcd.java
@@ -0,0 +1,84 @@
+// Copyright 2011 Hakan Kjellerstrand hakank@gmail.com
+// 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 java.io.*;
+import java.util.*;
+import java.text.*;
+
+import com.google.ortools.constraintsolver.DecisionBuilder;
+import com.google.ortools.constraintsolver.IntVar;
+import com.google.ortools.constraintsolver.Solver;
+import com.google.ortools.constraintsolver.*;
+
+public class Xkcd {
+
+  static {
+    System.loadLibrary("jniortools");
+  }
+
+
+  /**
+   *
+   * Solves the xkcd problem.
+   * See http://www.hakank.org/google_or_tools/xkcd.py
+   *
+   */
+  private static void solve() {
+
+    Solver solver = new Solver("Xkcd");
+
+    int n = 6;
+    // for price and total: multiplied by 100 to be able to use integers
+    int[]price = {215, 275, 335, 355, 420, 580};
+    int total = 1505;
+
+    //
+    // Variables
+    //
+    IntVar[] x = solver.makeIntVarArray(n, 0, 10, "x");
+
+    //
+    // Constraints
+    //
+    solver.addConstraint(
+        solver.makeEquality(solver.makeScalProd(x, price).var(), total));
+
+    //
+    // Search
+    //
+    DecisionBuilder db = solver.makePhase(x,
+                                          solver.CHOOSE_FIRST_UNBOUND,
+                                          solver.ASSIGN_MIN_VALUE);
+    solver.newSearch(db);
+
+    while (solver.nextSolution()) {
+      System.out.print("x: ");
+      for(int i = 0; i < n; i++) {
+        System.out.print(x[i].value() + " ");
+      }
+      System.out.println();
+    }
+    solver.endSearch();
+
+    // Statistics
+    System.out.println();
+    System.out.println("Solutions: " + solver.solutions());
+    System.out.println("Failures: " + solver.failures());
+    System.out.println("Branches: " + solver.branches());
+    System.out.println("Wall time: " + solver.wallTime() + "ms");
+
+  }
+
+  public static void main(String[] args) throws Exception {
+    Xkcd.solve();
+  }
+}