根据高和底就三角形面积

改错

public class Square{
private double a;
private double b;
Square(double a,double b){
this.a = a;
this.b = b;
}
public double getA(){
return a;
}
public double getB(){
return b;
}
public double area(){
double s1=1/2(a*b);
return s1;
}
}

1/2(ab)应该会报错吧，代码的不可以省略

double s1 = (a * b) / 2; 或者 乘0.5