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