public class Triangle {

int x,y,z; //這是三角形三條邊的長度

private void triangle(int x,int y,int z) {

this.x=x;

this.y=y;

this.z=z;

}

private int perimeter(){

return this.x+this.y+this.z;

}

private double area(){

int p = this.perimeter() / 2;

return Math.sqrt(p*(p-this.x)*(p-this.y)*(p-this.z));

}

public static void main(String[] args) throws Exception {

Triangle t = new Triangle(3,4,5);

System.out.println("該三角形的周長為:" + t.perimeter());

System.out.println("該三角形的面積為:" + t.area());

}

}

上面程式碼儲存為Triangle.java即可測試執行~~手寫程式碼,不保證完全正確,但思路絕對是正確的