public class Triangle extends Shape {
    private double base;
    private double height;
    
    // 构造方法
    public Triangle(double base, double height) {
        this.base = base;
        this.height = height;
    }
    
    // 实现抽象方法，计算三角形的面积
    @Override
    public double getArea() {
        return 0.5 * base * height;
    }
    
    // getter和setter方法
    public double getBase() {
        return base;
    }
    
    public void setBase(double base) {
        this.base = base;
    }
    
    public double getHeight() {
        return height;
    }
    
    public void setHeight(double height) {
        this.height = height;
    }
}