Java 如何修复if和elseif语句没有选择正确的语句

我在做一个长方体计算器，输入长度、宽度和高度，然后计算并比较两者，然后说“第一个长方体比下一个稍大”，反之亦然。问题是，我有多条语句，说如果盒子是大小的两倍，三倍，四倍，但它只看到盒子一比盒子二大，并显示它

我已经尝试了所有的if语句，将方框分割或相乘

public void calculateSizes() {
    firstBox.calcVolume();
    secondBox.calcVolume();

    if (firstBox.calcVolume() == secondBox.calcVolume()) {   //Calculate the size difference and display the corresponding message
        message = ("The first box is the same size as the second box");
    }else if (firstBox.calcVolume() > secondBox.calcVolume() ) {
        message = ("The first box is slightly bigger than the second box");

    }else if (secondBox.calcVolume() > firstBox.calcVolume()) {
        message = ("The second box is slightly bigger than the first box");

    }else if (firstBox.calcVolume() >= secondBox.calcVolume() / 2) {
        message = ("The first box is twice the size than the second box");

    }else if (secondBox.calcVolume() >= firstBox.calcVolume() / 2) {
        message = ("The second box is twice the size than the first box");

    }else if (firstBox.calcVolume() >= secondBox.calcVolume() / 3) {
        message = ("The first box is triple the size than the second box");

    }else if (secondBox.calcVolume() >= firstBox.calcVolume() / 3) {
        message = ("The second box is triple the size than the first box");

    }else if (firstBox.calcVolume() >= secondBox.calcVolume() / 4) {
        message = ("The first box is quadruple the size than the second box");

    }else if (secondBox.calcVolume() >= firstBox.calcVolume() / 4) {
        message = ("The second box is quadruple the size than the first box");

    }else if (firstBox.calcVolume() == firstBox.calcVolume() / secondBox.calcVolume()) {
        message =("\n Box one is " + firstBox.calcVolume() / secondBox.calcVolume() + " times the size second box" );

    }else if (secondBox.calcVolume() == secondBox.calcVolume() / firstBox.calcVolume()) {  
        message =("\n Box two is " + secondBox.calcVolume() / firstBox.calcVolume() + " times the size first box");
    }
}

---

如果s，则需要颠倒

的顺序。首先，您需要检查

firstBox.calcVolume（）/secondBox.calcVolume（）
和
secondBox.calcVolume（）/firstBox.calcVolume（）
如果大于4，则使用这些
if
s，否则按相反顺序使用第一组
if
s

代码的问题是，当最后一个条件为真时，第一个条件已经为真，因此它永远不会进入它们。我的意思是当
a
number比number

b大四倍时，它也比它大：），因此将设置较高的消息

public void calculateSizes() {
//if you assign these values to variables it will be much better and you wont need to compute it all the time    
firstBox.calcVolume();
secondBox.calcVolume();


message = "\n ";
if (secondBox.calcVolume() > firstBox.calcVolume() &&  secondBox.calcVolume() / firstBox.calcVolume() > 4 ) {  
    message += ("Box two is " + (secondBox.calcVolume() / firstBox.calcVolume()) + " times the size first box");
} else if (firstBox.calcVolume() > secondBox.calcVolume() &&  firstBox.calcVolume() / secondBox.calcVolume() > 4 ) {  
    message += ("Box one is " + (firstBox.calcVolume() / secondBox.calcVolume()) + " times the size second box" ); 
} else if (firstBox.calcVolume() == secondBox.calcVolume()) { 
    message += ("The first box is the same size as the second box");
} else if (secondBox.calcVolume() >= firstBox.calcVolume() / 4) {
    message += ("The second box is quadruple the size than the first box");
} else if (firstBox.calcVolume() >= secondBox.calcVolume() / 4) {
    message += ("The first box is quadruple the size than the second box");
} else if (firstBox.calcVolume() >= secondBox.calcVolume() / 3) {
    message += ("The first box is triple the size than the second box");
} else if (secondBox.calcVolume() >= firstBox.calcVolume() / 3) {
    message += ("The second box is triple the size than the first box");
} else if (firstBox.calcVolume() >= secondBox.calcVolume() / 2) {
    message += ("The first box is twice the size than the second box");
} else if (secondBox.calcVolume() >= firstBox.calcVolume() / 2) {
    message += ("The second box is twice the size than the first box");
} else if (firstBox.calcVolume() > secondBox.calcVolume() ) {
    message += ("The first box is slightly bigger than the second box");
} 
 }

---

如果s，则需要颠倒

的顺序。首先，您需要检查

firstBox.calcVolume（）/secondBox.calcVolume（）
和
secondBox.calcVolume（）/firstBox.calcVolume（）
如果大于4，则使用这些
if
s，否则按相反顺序使用第一组
if
s

代码的问题是，当最后一个条件为真时，第一个条件已经为真，因此它永远不会进入它们。我的意思是当
a
number比number

b大四倍时，它也比它大：），因此将设置较高的消息

public void calculateSizes() {
//if you assign these values to variables it will be much better and you wont need to compute it all the time    
firstBox.calcVolume();
secondBox.calcVolume();


message = "\n ";
if (secondBox.calcVolume() > firstBox.calcVolume() &&  secondBox.calcVolume() / firstBox.calcVolume() > 4 ) {  
    message += ("Box two is " + (secondBox.calcVolume() / firstBox.calcVolume()) + " times the size first box");
} else if (firstBox.calcVolume() > secondBox.calcVolume() &&  firstBox.calcVolume() / secondBox.calcVolume() > 4 ) {  
    message += ("Box one is " + (firstBox.calcVolume() / secondBox.calcVolume()) + " times the size second box" ); 
} else if (firstBox.calcVolume() == secondBox.calcVolume()) { 
    message += ("The first box is the same size as the second box");
} else if (secondBox.calcVolume() >= firstBox.calcVolume() / 4) {
    message += ("The second box is quadruple the size than the first box");
} else if (firstBox.calcVolume() >= secondBox.calcVolume() / 4) {
    message += ("The first box is quadruple the size than the second box");
} else if (firstBox.calcVolume() >= secondBox.calcVolume() / 3) {
    message += ("The first box is triple the size than the second box");
} else if (secondBox.calcVolume() >= firstBox.calcVolume() / 3) {
    message += ("The second box is triple the size than the first box");
} else if (firstBox.calcVolume() >= secondBox.calcVolume() / 2) {
    message += ("The first box is twice the size than the second box");
} else if (secondBox.calcVolume() >= firstBox.calcVolume() / 2) {
    message += ("The second box is twice the size than the first box");
} else if (firstBox.calcVolume() > secondBox.calcVolume() ) {
    message += ("The first box is slightly bigger than the second box");
} 
 }

---

刚刚编辑了我的答案，请运行它，看看是否有效，并指定firstBox.calcVolume（）；另一行类似于

int firstVolume=firstBox.calcVolume（）int firstVolume=firstBox.calcVolume（）。