如何防止int在减法后变为负数？

public int safeSubtract(int a, int b) {
    if (a >= b) {
        return a - b;
    } else {
        // 可以选择返回0或其他默认值
        return 0;
    }
}

public int safeSubtract(int a, int b) {
    return Math.max(a - b, 0);
}

public int safeSubtract(int a, int b) throws IllegalArgumentException {
    if (a < b) {
        throw new IllegalArgumentException("Result would be negative");
    }
    return a - b;
}

public class InventoryManager {
    private int stock;

    public InventoryManager(int initialStock) {
        this.stock = initialStock;
    }

    public void removeItems(int quantity) {
        if (quantity > stock) {
            System.out.println("Not enough items in stock");
            // 可以选择不执行减法操作或设置库存为0
            stock = 0;
        } else {
            stock -= quantity;
        }
    }

    public int getStock() {
        return stock;
    }
}