publicclasshw3Shape{//形狀的抽象類publicabstractclassShape{publicShape(){}publicabstractdoublearea();publicabstractvoiddisplayArea();}//三角形類publicstaticclassTrianglee...

public class hw3Shape {

//形狀的抽象類

public abstract class Shape{

public Shape(){}

public abstract double area();

public abstract void displayArea();

}

//三角形類

public static class Triangle extends Shape {

//定義屬性：三角形的底和高

private double triaSide;

private double triaHeight;

public Triangle(double a,double b){

this.setTrian(a,b);

}

public void setTrian(double a,double b){

this.triaSide = a;

this.triaHeight = b;

}

//定義方法：計算面積

public double area(){

double result;

result = this.triaSide * this.triaHeight / 2;

return result;

}

//定義方法：打印面積

public void displayArea(){

System.out.print("該三角形的面積為："+area());

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

double a=0,b=0;

System.out.print("請依次輸入三角形的邊長和對應的高：");

Scanner sc = new Scanner(System.in);

a = sc.nextDouble();

b = sc.nextDouble();

Shape triang = new Triangle(a, b);

triang.displayArea();

sc.close();

}

}

初學者用Eclipse編譯時Shape triang = new Triangle(a, b);一直出錯，在網上找了好久沒找到解決方法，求指教

說錯了，用這種方法時錯的是public Triangle(double a,double b){ this.setTrian(a,b); }

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