Question

1.用java定义“梯形”类，实现初始化，基本参数修改，求解面积等功能

Answer 1

public class Trapezoid {
private int height = 0;
private int top = 0;
private int bottom = 0;

public int getHeight() {
return height;
}

public void setHeight(int height) {
this.height = height;
setArea();
}

public int getTop() {
return top;
}

public void setTop(int top) {
this.top = top;
setArea();
}

public int getBottom() {
return bottom;
}

public void setBottom(int bottom) {
this.bottom = bottom;
setArea();
}

private int area = 0;

public Trapezoid(int height, int top, int bottom) {
this.height = height;
this.top = top;
this.bottom = bottom;
setArea();
}

public int getArea() {
return area;
}

private void setArea() {
this.area = (top + bottom) * height / 2;
}
}