板材下料 java 源码

板材下料是指根据给定的板材尺寸和需求尺寸，通过计算和优化，确定最佳的下料方案，以最大限度地减少板材的浪费和成本。下面是一个简单的Java源码示例，用于实现板材下料的功能：

import java.util.ArrayList;
import java.util.List;

public class BoardCutting {
    
    static class Dimension {
        int length;
        int width;
        
        public Dimension(int length, int width) {
            this.length = length;
            this.width = width;
        }
    }
    
    static List<Dimension> getOptimalCuttingPlan(int boardLength, int boardWidth, List<Dimension> requiredDimensions) {
        List<Dimension> cuttingPlan = new ArrayList<>();
        
        for (Dimension requiredDimension : requiredDimensions) {
            int length = requiredDimension.length;
            int width = requiredDimension.width;
            
            if (length > boardLength || width > boardWidth) {
                cuttingPlan.add(null); // 该尺寸无法从板材中切割出来
            } else if (length == boardLength && width == boardWidth) {
                cuttingPlan.add(new Dimension(boardLength, boardWidth)); // 不需要切割
            } else if (length > width && width <= boardWidth) {
                cuttingPlan.add(new Dimension(boardLength, width));
            } else if (width > length && length <= boardLength) {
                cuttingPlan.add(new Dimension(length, boardWidth));
            } else {
                cuttingPlan.add(new Dimension(length, width));
            }
        }
        
        return cuttingPlan;
    }
    
    public static void main(String[] args) {
        List<Dimension> requiredDimensions = new ArrayList<>();
        requiredDimensions.add(new Dimension(120, 80));
        requiredDimensions.add(new Dimension(90, 60));
        requiredDimensions.add(new Dimension(150, 100));
        
        int boardLength = 240;
        int boardWidth = 120;
        
        List<Dimension> cuttingPlan = getOptimalCuttingPlan(boardLength, boardWidth, requiredDimensions);
        
        for (int i = 0; i < requiredDimensions.size(); i++) {
            Dimension requiredDimension = requiredDimensions.get(i);
            Dimension cutDimension = cuttingPlan.get(i);
            
            if (cutDimension == null) {
                System.out.println("无法从板材中切割出 " + requiredDimension.length + "x" + requiredDimension.width + " 的尺寸");
            } else {
                System.out.println("切割 " + cutDimension.length + "x" + cutDimension.width + " 从 " + boardLength + "x" + boardWidth + " 的板材中");
            }
        }
    }
}

以上是一个简单的板材下料的Java源码示例，使用一个内部类`Dimension`表示尺寸，`getOptimalCuttingPlan`方法用于计算最佳的下料方案，`main`方法用于测试。测试时，我们给定了一个板材尺寸和需要下料的各种尺寸，然后通过调用`getOptimalCuttingPlan`方法计算出最佳下料方案，并打印出各个尺寸的切割结果。