爲什麼我的操作員說「無效字符」？

Question

爲什麼我的操作員說「無效字符」？ 我想回到我的三角區域，所以我用這個方程。

public double getArea() { 

    double x = (getSide1() + getSide2() + getSide3()) /2; 

    double answer = x - ­ getSide1(); 

    answer = answer * x; 

    answer = answer * (x - ­getSide2()); 

    answer = answer * (x ­- getSide3()); 

    answer = Math.sqrt(Math.abs(answer)); 

    return answer; 

} 

public void setArea(double area) { 

    this.area = area; 

} 

Answer 1

這是Java而不是JavaScript。 x之後沒有運營商。這就是爲什麼。此外，這看起來更像是編碼問題，因爲-的字符與—不一樣。

public double getArea() { 
    double x = (getSide1() + getSide2() + getSide3()) /2; 
    double answer = x -­ getSide1(); 
    answer = answer * x; 
    answer = answer * (x -­ getSide2()); 
    answer = answer * (x ­- getSide3()); 
    answer = Math.sqrt(Math.abs(answer)); 
    return answer; 
} 

public void setArea(double area) { 
    this.area = area; 
}