knapsack.java

public class Knapsack {
    public static int stackSack(int items, int[] weight, int[] value, int number) {
        int[][] knapsack = new int[number + 1][items + 1];
        
        // Build table for knapsack[][] in bottom up manner
        for (int i = 0; i <= number; i++) {
            for (int j = 0; j <= items; j++) {
                if (i == 0 || j == 0) {
                    knapsack[i][j] = 0;
                } else if (weight[i - 1] <= j) {
                    knapsack[i][j] = Math.max(value[i - 1] + knapsack[i - 1][j - weight[i - 1]], knapsack[i - 1][j]);
                } else {
                    knapsack[i][j] = knapsack[i - 1][j];
                }
            }
        }
        
        return knapsack[number][items];
    }
    
    public static void main(String[] args) {
        int[] value = {60, 100, 120};
        int[] weight = {10, 20, 30};
        int items = 50;
        int number = value.length;
        
        int result = stackSack(items, weight, value, number);
        System.out.println(result);
    }
}