A-M baby

Task/Knapsack-problem-Continuous/Java/knapsack-problem-continuous-3.java

@@ -0,0 +1,59 @@
+package hu.pj.obj;
+
+public class Item implements Comparable {
+
+    protected String name       = "";
+    protected double weight     = 0;
+    protected double value      = 0;
+    protected double inKnapsack = 0; // the weight of item in solution
+
+    public Item() {}
+
+    public Item(Item item) {
+        setName(item.name);
+        setWeight(item.weight);
+        setValue(item.value);
+    }
+
+    public Item(double _weight, double _value) {
+        setWeight(_weight);
+        setValue(_value);
+    }
+
+    public Item(String _name, double _weight, double _value) {
+        setName(_name);
+        setWeight(_weight);
+        setValue(_value);
+    }
+
+    public void setName(String _name) {name = _name;}
+    public void setWeight(double _weight) {weight = Math.max(_weight, 0);}
+    public void setValue(double _value) {value = Math.max(_value, 0);}
+
+    public void setInKnapsack(double _inKnapsack) {
+        inKnapsack = Math.max(_inKnapsack, 0);
+    }
+
+    public void checkMembers() {
+        setWeight(weight);
+        setValue(value);
+        setInKnapsack(inKnapsack);
+    }
+
+    public String getName() {return name;}
+    public double getWeight() {return weight;}
+    public double getValue() {return value;}
+    public double getInKnapsack() {return inKnapsack;}
+
+    // implementing of Comparable interface:
+    public int compareTo(Object item) {
+        int result = 0;
+        Item i2 = (Item)item;
+        double rate1 = value / weight;
+        double rate2 = i2.value / i2.weight;
+        if (rate1 > rate2) result = -1;  // if greater, put it previously
+        else if (rate1 < rate2) result = 1;
+        return result;
+    }
+
+} // class